tube amplifier

Muse 6N11 Class A Tube Hybrid Headphone Amplifier

Muse 6N11 Class A Tube Hybrid Headphone Amplifier

From the time I was a kid I was fascinated with vacuum tubes. Maybe it was the filament glow coming from the otherwise darkened cabinet, or the precision of having to set the pins in just the right direction. Whatever the case may be, I could not help to have a passing thought of Thomas Edison going thru hundreds of different filament materials before finding one that actually worked. Move ahead to FDR’s fireside chats and the tens of millions of Americans who found hope in the warmly conveyed words of the President thru a tabletop radio-vacuum tubes and their yellowish glow unquestionably bespeaks “Americana.”

Specifications:

Frequency response: 10Hz-60KHz +/- 0.25dB
Signal/Noise Ra@o: >91dB
Dynamic range: 84.6dBA(300 ohm) 89.8dBA(33 ohm)
THD: 0.016%(300 ohm) 0.45%(33 ohm)
IMD + Noise: 0.045(300 ohm) 0.42(33ohm)
Dimensions: 79mm (D) X 79mm (W) X 44mm (H) // 3.1” x 3.1” x 1.75”
Shipping Weight: 0.55 kg // 1.2 lbs. read more…

Trends Audio PA-10 Hybrid Tube Headphone Amplifier

Trends Audio PA-10 Hybrid Tube Headphone Amplifier

Specifications:

  • Vacuum Tube: 6DJ8/6922 series or 12AU7 series (exchangeable) Output Stage: MOSFET x 2
  • Amplification Gain: x3 (for Audio CD/DAC IN) x20 (for Audio PC/iPod IN) Signal-to-Noise Ratio: (SNR) 92dB
  • Power Output: 3.0 Watts per channel on 33 Ohm Headphone
  • Frequency response: 15 Hz -100 kHz -1db
  • Input Impedance: 100k Ohms
  • THD+Noise: 0.05% @ 10k ohm0.15% @ 33 ohm
  • Input: CD/DAC IN RCA (Left/Right) x 1 [3Vpp max.] PC/iPod IN RCA (Left/Right) x 1 [0.55Vpp max.]
  • Output Audio OUT RCA (Left/Right) x 1
  • Headphone OUT (3.5mm) x 1
  • Power Socket: (5.5mm/2.1mm) x 1
  • Power Supply: DC 24V-26.5V (max.) Dimensions: (W) 3” x (H) 1.70” x (D) 4.50” Weight: 13.4 oz
  • Price: $225

Having had a positive experience with the Trends Audio TA 10.1 amplifier, I was anxious to review the Trends Audio PA-10 Tube headphone amplifier when the opportunity presented itself. With a limited budget, building a respectable headphone system is the most economical way to enter the world of true high fidelity. Just add a Zune, an iPod, or a CD player, some quality headphones and you can assemble a nice sounding affordable audio system for just a few hundred dollars. read more…

Manley Stingray Integrated Tube Amplifier

Manley Stingray Integrated Tube Amplifier

Features And Specifications:

  • 4 x Stereo Line RCA Inputs TRIODE -UL Switching RECORDING OUT SUBWOOFER OUT TAPE LOOP (Insert) with Bypass switch
  • Passive Noble Volume and Balance Controls
  • All-Vacuum Tube Lo-feedback Stereo Integrated Design Output Tubes: 8 x EL84 Ships with Russian NOS EL84M (aka 6Pi14Pi-EB) (We are out of Ei 6BQ5)
  • Driver Tubes: 2 x 6414 Ships with GE or RAYTHEON JAN NOS USA or 6414W
  • Input Tubes: 2 x 12AT7EH Ships with: 12AT7EH large plate Electro-Harmonix Russian
  • Maximum Output Power UL mode: 40 Watts x 2 channels
  • 1.5% THD @ 1kHz
  • Maximum Output Power TRIODE mode: 20 Watts x 2 channels
  • Frequency Response: 15 Hz -40 kHz, -1dB Gain: 37 dB at max Volume
  • Input Sensitivity: 185 mV in = 50 watts out into 5 ohms Input Sensitivity Triode: 66mV in = 1W into 8 ohms Input Sensitivity UL: 53mV in = 1W into 8 ohms
  • S/N Ratio: typically 87 dB A-WGT, 20Hz-20KHz
  • Input Impedance: 50 Kohm nominal
  • Optimum Speaker Load: 5 ohms
  • Actual Output Impedance at 20Hz: 2.8 ohms at 100Hz: 2.6 ohms at 1KHz: 2 ohms
  • Damping Factor: 5
  • Power Consumption Idle: 200W
  • Maximum Power Consumption at Full Power: 370W MAINS Fuses:
  • 100~120VAC operation: MDL 3 AMP / 250 Volt SLO-BLO
  • 220~240VAC operation: MDL 1.5 AMP / 250 Volt SLO-BLO
  • B+ FUSES (2): MDA 1/4 AMP, 250 Volt SLO-BLO, Ceramic. (Located internally)
  • Power Supply: is factory set for 100V, 120V or 220-240VAC operation for original destination country’s mains voltage.
  • Operating Mains Voltage: changeable with power transformer re-wiring on PCB and fuse value change. Mains Voltage Frequency: 50~ 60Hz
  • Power Cord: Detachable IEC standard.
  • Appropriate power cord supplied for destination country
  • Dimensions: W= 19″, D=14″, H=5 ½” Shipping Weight: 30lbs.
  • Price: $2250

Here I go again putting on my diving gear so I can take a playful romp with my friends in the ocean. In the October I wrote about the Manley Labs Shrimp tube preamplifier ($1880) and what an amazing journey it is to browse through their online website. I was so taken by the Shrimp that EveAnna Manley, the President of Manley Labs, offered me up another one of her friendly sea creature products for review. This time instead of the Shrimp it was the Stingray. The Stingray is a tube integrated line level tube amplifier (phono stage not included), priced at only $2250. As of late I have been reviewing quite a lot of integrated amplifiers. I find that they are a great alternative for those who do not want to pay the bigger money for separates. Couple this with taking up less space in our audio cabinets, the need to buy less interconnects, power cords and the ability to use smaller power conditioners and you wind up saving a good deal of your hard earned money.

On your amazing journey through their vast website it is in the Manley audiophile hifi gear page that you will find the Stingray and other home audio equipment. Once there you will notice that Manley Labs just loves tubes, which is quite evident by the amount of tube gear they are offering to the public. The great thing about a manufacturer that has so many tube pieces is that they understand how to design and to build them. Tube equipment is their bread and butter, not just an afterthought to fill in the product line so they can say that they have a little bit of something for everyone. Their confidence in the finished product is evident when Manley Labs stands behind the Shrimp with a 90-day limited warranty that is extended to a full five years (The warranty is to the original purchaser and must be accompanied with proof of the date of purchase.) and all you need to do is to fill out the warranty card and send it in before 30 days expire. Five years, you’ve got to love it in an era where one to three years is quite common.

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Xindak MT-3 Tube Stereo Integrated Amplifier

Xindak MT-3 Tube Stereo Integrated Amplifier

Specifications:

  • Tube: EL34*4, 12AX7*1, 6N8P (6SN7GT)*2
  • Output power: 18wpc (Triode), 40wpc (Pentode) THD: 0.2%(1KHz)
  • Frequency Response: 10Hz~70KHz
  • SNR: 89dB
  • Input Switch: 3 Groups Input Sensitivity: 400mV Input Impedance: 50 Kohm
  • Output Impedance: 4ohm, 8ohm
  • Consume Power: 300W (Pentode)
  • Dimension: 358mm (W)*321mm(D)*197mm(H) Weight: 41 lbs (18.5Kg)
  • Price: $830
  • Manufacturer: Chengdu Xindak Electronic Co., LTD. China.
  • Lotus Audio Imports is the exclusive U.S. distributor of Xindak Electronic

Chengdu is the capitol of Sichuan province in the southwest part of China. The fact that it has one of the lowest sunshine rates in all of China, even more so than even London, makes you wonder what people in Chengdu do on such dreary days. Well if you work for Chengdu Xindak Audio & lighting Equipment Factory you might just make Xindak audio equipment. Xindak has been making audio components since 1988 and has a lineup that includes, stereo power amplifiers, mono block amps, integrated amps, hybrid integrated amps, preamps, CD players, dacs, interconnects, digital interconnects, power cords, power conditioners, output transformers, wall outlets, silver fuses, ipod docs, vibration tuning devices and even a moving-coil cartridge transformer module. Now that is enough to make the sun shine through on even the cloudiest of days. .

Xindak offers a wide range of audio gear with prices ranging from the very inexpensive upwards, but with nothing too highly priced. Looking at their website I made a list of products for potential review. When Lotus Audio Imports, their US distributor, sent me their price list I was in shock. No not the type of sticker shock you get when you walk into a new car showroom and realize that you are priced out of the market for that shiny little sports car you saw on the freeway, but just the reverse. For the most part you can buy more than you thought for even less then you were thinking. Still don’t be surprised because some of their gear does get pricey as they offer the absolutely stunning CS6.0 integrated amplifier for $3600 or their V60 mono block amplifiers with 2A3C and 6SN7GT tubes for $5000, but these and a few others are the exception. For this review I was considering the V30 integrated amplifier with two 12AX7(ECC83), two 6N8P(6SN7) and four KT88 (6550) tubes for the low price of about $1500. I had also inquired about their XA6800SE and XA6950 integrated amps around $1350 each. Please go check out their website and look into these products to see what I am talking about, they appear to be a very good value. As of yet I have not auditioned the others but I am looking forward to doing so soon. Xindak is well known in China and appears to be spreading its wings around the world. Besides China they have distributors in 23 other different countries worldwide including the one in America (Lotus Audio Imports in Oakland California). Their distributors can be found in places such as Malaysia, Austria, Greece, Australia, France, Russia, Israel and Costa Rica to name just a few.

For a long time their products have sold well in China and have received awards and some very good press in their home country as well as abroad. One thing Xindak is quite famous for is their cable, some of which can get very expensive and innovative. New this year they have come out with a carbon-fibre digital interconnect. Xindak claims that carbon-fibre imparts no “skineffect” and therefore emits a purer sound, that does not change over time, as carbon is stable and does not tarnish. Of further interest is their Gold Series Cables. Yes they actually make cables using different amounts of gold foil mixed with other metals. The more gold involved obviously the higher the price of the cable. The Gold Series cables are made for Loudspeaker, Interconnect and Power Cords. While not low priced per say they are a good bargain price-wise considering the amount of precious metals they use. I was able to get my hands on a pair of the Gold Series interconnects which I was quite impressed with and will been sad to return.

My first review of Xindak products will be the MT-3 tube integrated amplifier. This is an auto-biasing amp by the way to make adjustment a thing of the past for those not so inclined as to bias your own tubes. The MT-3 is a 40 watt tube integrated amplifier that can switch from standard pentode to18 watt triode mode with a flip of two toggle switches (one for each channel), and does it all for only $830. Now of course EL34 tubes are not triodes but they can however be wired to work in triode mode. The EL34’s sounds so good in triode because of the sweet natural engaging characteristics of the tube. Xindak states that the reason to go triode is’ “decreasing the distortion, widening frequency response and increasing dynamic range”. For this review I was able to use the triode mode because of my high efficiency Klipsch Klipschorn speakers. I found that the MT-3 in triode a better match for my Klipschorn’s than when used in the pentode mode. Since the Klipschorn speakers have a sensitivity of 104db 18-watts triode is plenty of power for my room. If you want more juice though just switch over to pentode and power up to a full 40-watts. In pentode I was able to drive the Legacy Focus 20/20/s which are high efficiency speakers, but not of course as efficient as my Klipschorns.

Xindak MT-3 Tube Stereo Integrated Amplifier review2

I was immediately taken by the fact that this amplifier was quite heavy (41 lbs). I guess I just did not expect a $830 tube integrated amplifier from China to feel so sturdy. My next surprise came when I opened the box. Sitting on top of the Styrofoam that encased the amplifier were three things. First was a nice cloth tote bag with a string to close off the end, to use if you want to protect the MT-3 during any moving process. Next to that was a pair of cloth white gloves for when you actually need to handle the tubes so as not to get the oil from your hands and fingers on them. It was a nice touch to get these small gifts with the MT-3 especially since it was an unannounced surprise. Thirdly, under the two of these was the owner’s manual. This was short, concise and to the point. I liked that. Of course there is the normal warning about what to do and what not to do with the MT-3 so read it before you play.

On the front of the MT-3 is a power on/off button with a blue light indicating when it is on. To the right of that is the source knob and again to its right the volume control. The MT-3 comes equipped with a sturdy cage to protect the tubes. You will also find two toggle switches (next to the EL34 tubes) for changing modes. You need to switch both, one for each channel, to go from pentode to triode or triode back to pentode. I do recommend though that you do so when the amp is off. If the amplifier is still on when you flip the switches it will make a loud noise through the speakers even with the volume turned all the way down. The three transformers located behind the tubes to the rear of the unit were never hot to the touch even though the tubes did get hot rather quickly. Still to be on the safe side always be careful when touching any part of the amplifier after it has warmed up. I ran the amp for seven hours straight, inside my salamander rack with no back enclosure and a front door with a perforated screen, so ventilation was very good. Peaking around to the rear of the MT-3 you will find an IEC connector where you may use the supplied standard power cord or upgrade to your hearts delight with others of your own choosing. Also there are three sets of speaker terminals. One set is for the negative speaker connections and the other two are for 4 or 8ohm speaker connections. Finally there are three inputs for whatever pleases you. I used only two; one for CD and the other for my Whest phono stage so I could spin my vinyl. Since the MT-3 does not have a phono stage you must buy one if you want to listen to records, which of course I hope you do.

The unit that I used for this review was brand new and not a review sample tweaked in any way just especially for the reviewer. It came to me through the US distributor wrapped up inside an unopened factory box. Because of this though I did have to wait a bit to break-in the amplifier, with it’s tubes and standard power cord. No problem though because right out of the box the MT-3 sounded just fine. In fact I was quite surprised how good it did sound without any break-in whatsoever. The stock tubes supplied were Electro Harmonix EL34’s and 12AX7’s as well as two 6SN7GT tubes of Chinese origin.

Xindak MT-3 Tube Amplifier front

Using my Whest phono stage, playing through the MT-3, I listened to three different records. Mirror Puzzle is a wonderful jazz record cut on 180gram vinyl with pianist and composer Kei Akagi. It is very difficult getting a stereo to reproduce a full sized instrument, like a piano, in ones own living area yet the MT-3 did a good job of it. On “Lester Left Town” Kei Alago glides through piano scales rather quickly and the MT-3 was able to keep up with him and at the same time providing the listener with just the right amount of decay to each note. The sound of Rick Margitza on sax was pleasing as were Charles Fambrough on bass with Willie Jones III on drums. While I found that the MT-3 did a great job overall I felt it did lack ultimate authority in the lower bass with my system and speakers. Remember though this integrated amplifier is priced at only $830. So I really could not expect everything from a product priced so low. What it did though, it did very well and it certainly was a pleasure to listen to.

I also had on hand my vinyl copy of the Original Master Recording version of Al Stewart’s Year Of The Cat. Before you ask, there is no year of the cat on the Chinese calendar. There are twelve animals but the cat did not make it (maybe he overslept?). The title song has a nice guitar and also saxophone solo. The MT-3 had a lot of fun with both of those as it can reproduce single instruments with ease. Listening to Al Stewart’s distinct yet clear voice was also a pleasure with the MT-3.

Before leaving my vinyl rig behind I had to listen to my Original Master Recording of Billie Holiday’s Body and Soul  album recorded on 200 grams of high definition vinyl. “They Can’t Take That Away From Me” is a great song and the MT-3 really gets this blues performance right. One thing this little amp does is let the feeling of the performer shine through. Again nice sax in the background and Billie Holiday’s magical voice is reproduced quite well allowing you to enjoy her performance within the feeling of an intimate setting.

Moving forward now to my CD collection we have Dire Straits, Brother In Arms, and their famous song “Walk Of Life”. The MT-3 gives us a presentation that is a little bit more 9th row rather than 7th. Things appear relaxed and not thrown at you in your face 5th row, as some solidstate amps have done. The soundstage was nice and wide with individual instruments and performers easily heard within it. This song was fun, as it was intended to be, and the MT-3 made sure you enjoyed it that way.

Xindak MT-3 Tube Stereo Integrated Amplifier

Alan Jackson has a great big country western voice and I had to hear him sing, “Here In The Real World”, from the CD with the same name. I had a feeling the MT-3 would do a great job here and it did. His voice was deep and clear while the guitar and violins were also a pleasure to listen to. The MT-3 with its tube sound took just enough edge off the violins to make it even more pleasurable.

I was beginning to get the feel now for what the MT-3 could do and do very well. It just loved vocals, male or female, string instrument and piano solos. If you want to hear an eerie song listen to Sting’s The Dream Of The Blue Turtles CD and the song called “Russians”. This has a very haunting message. Couple this song with the MT-3’s knack for revealing the essence of a performance and you are in for a real treat. Those of us who grew up with the cold war threat between Russian and America will have a better grasp of the songs meanings. Hearing the words “I hope the Russians love their children too” expresses the hope that Sting believed would prevail to prevent a war between the two countries. You must listen to this song, every line is packed with thoughts that are universal and ring true even today. Once again the Xindak MT-3 did a good job with the musical passages and was a great pleasure to hear.

Next up I put on the CD, Body & Soul, a Time Life Music production with 24 sensual songs by various artists. “Sexual Healing”, done by Marvin Gaye was astounding. It starts out with Marvin whispering to his lover “get up, get up, get up, get up, wake up, wake up, wake up, wake up.” This song continues to be very popular and for good reason as it playfully expresses the universal emotions that exist between two lovers. Add that to the MT-3’s ability to produce intimacy and you have a winner all the way around.

Now it was time to tweak the MT-3 a little. Calvin Tseng, of Lotus Audio Import, the US distributor for Xindak, arranged for me to meet with Dave Kalin. Both Dave Kalin and Jim Pierce are the owners of Solar Winds Audio (solarwindsaudio.com) and are a Xindak dealer located in Milpitas California. Dave Kalin came over to my house bringing with him a stock Xindak MT-3 with upgraded tubes and tube rings. These tubes were cryogenically treated by Cryoset (a company also out of Milpitas California). He used 4 KT77 Reissue Genalex Gold Lion, 2 6SN7 EH ElectroHarmonix Gold Pin and 1 ECC83/12AX7 JJ tube. The tube rings were by Golden Dragon, a total of 7 in all, one for each tube. He sells the MT-3 for $830 and the upgrades are $500 for the tubes and rings, total price $1330 plus tax. This and the fact that you still get to keep the original factory tubes for comparison make this a great way to go if you decide to upgrade.

Xindak MT-3 Tube Stereo Integrated Amplifier back

Dave Kalin explained that his MT-3 had over 400 hours on it and since mine had only 70 plus hours that some of the differences I would hear were because his was fully broken in. However most of the changes would be from the upgraded tubes and the addition of the tube rings. He was right when he said it would almost sound like a different amplifier. Everything took on more weight and right away I could tell I was getting more mid bass response from the MT-3 while the sound opened up and was even smoother than before. You can play with your choice of different tubes and tube rings or give Dave Kalin a call and buy his setup. Either way a lot more quality sound can be coaxed from the already wonderful little MT-3 by just making a few changes. Now he and I did play a little with some power cords, interconnects, power line conditioners and speaker cables that he brought over. Once again the sound jumped up a whole other level but at a cost of many times that of the amplifier itself. Still it sure was fun to see what could be done with the basic Xindak MT-3 tweaked to the max. Hey you have got to expect this when you put two audiophiles in a room full of equipment; no way we are not going to take things to the limit.

Xindak has done a great job with this integrated tube amplifier. You cannot expect everything for $830 and yes it does not seem to do the upper or lower octaves the way amps costing much more can. I must tell you though this amp was extremely quiet in my system. I was very impressed by its silence not only because it is a tube amplifier, but whether tube or solid state this still was one quiet amp. Be careful though to match it with speakers that are efficient and to play it in a small to medium sized room for best results. Do this and you will not only be smiling from the sounds you hear but because of all the money you just saved. This amp, even in stock form, competes with those in the $1000-$2000 range and does so very well. Never would I have guessed that it sells for only $830. It is an attractive tube amp with the ability to play in either pentode or triode mode, comes with a sturdy cage and is both an amplifier and a preamp in one box. If this is an example of Xindak product value then I’ve got to try more. Not only did the Chinese put on an incredible show for the 2008 Summer Olympics, where their athletes were extremely competitive, but they matched this feat by making a highly competitive integrated amplifier in the Xindak MT-3. If you get a chance you should try out the amazing MT-3 and maybe even take a peak at some of their other products as well.

The Listening Environment:

The listening room is 18 feet 8 inches long by 13 feet wide. The room’s cathedral ceiling starts at 8 feet high then slopes upward to 13feet at its peak in the middle. Flooring is a soft hardwood covering with an oriental rug placed dead center in between (but not under) the listener and the audio system. There are no doors that open or shut into other rooms also there are two large openings one facing the speakers and the other to its side and slightly in front of the right speaker. I have a nice snug fireplace opposite this opening and in front of the left speaker. As for my audio equipment it is tucked nicely inside of a Cherry Synergy Twin S30 Salamander audio rack.

Review equipment:

  • Sony DVP-S7700 CD/DVD Player (used as transport only)
  • Monarchy Audio Dual 20-Bit D/A Converter
  • Oracle Delphi Mk I turntable with custom made interconnects
  • Grace 707 tonearm with Denon 301 II MC cartridge Whest PhonoStage.20 + MsU.20 power supply Whest phono stage interconnects
  • Xindek Gold Series Interconnects Klipsch Klipschorn speakers Legacy Focus 20/20 speakers
  • Acoustic Revive RTP-4ultimate Power supply box
  • PS Audio Power Port Receptacle Anti-Cable speaker wire 10 foot pair Anti-Jumpers for Legacy speakers Anti-Interconnects (2 pairs)
  • Anti-Digital Interconnect single-shielded 1.5 meters in length
  • Monarchy Audio AC-1 power cord one 6 feet length (2) Blue Circle BC86 MKIII power line pillows (2)
  • Tek Line PC-8 Signature Power Cords 6-foot length
  • Mr-Cable Musician power cord 9 foot length Black Diamond Racing Cones (#3 & #4) Audio Prism IsoBearing (Isolation Globes
  • Cherry Synergy Twin S30 Salamander audio rack

from affordableaudio, By Anthony Nicosia

McIntosh MC275 Tube Amplifier (original 1960’s version)

McIntosh MC275 Tube Amplifier (original 1960’s version)

The original McIntosh MC275 stereo tube power amplifier is a thing of beauty. Looking at it one can only stare in awe at its craftsmanship and design. That alone would not be enough if it did not perform equally well to the task of reproducing music with grace and power.

Specifications:

  • Stereo or twin amplifier
  • 75-watts as stereo
  • 150-watts as monophonic
  • Harmonic Distortion >0.5% at 20Hz through 20,000 kHz
  • Noise and Hum 90db or more below rated output
  • Voltage Amplifier-one 12AX7 tube (drives both amps)
  • Phase Inverter-Two 12AU7 tubes Drive Amplifier-Two 12BH7 tubes Cathode Follower Drive-Two 12AT7 or 12AZ7
  • Output-Four KT88 or 6550 tubes
  • Weight 67 ½ lbs
  • Original price $444

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Harman Kardon Citation II Tube Amplifier

Harman Kardon Citation II Tube Amplifier

Original Specifications:

  • Manufactured between 1959-1962
  • Power Output: 60 watts/channel
  • Frequency Response @ 60W: 18Hz to 40,000 Hz +0, /-1.0 dB
  • Frequency Response @ 20W: 18Hz to 60,000 Hz +0, /-1.0 dB
  • Frequency Response @ 1W: 2Hz to 80,000 Hz+0, /-1.0 dB
  • Frequency Response (Power Amplifier): 10Hz to 80,000Hz +/-1.0 Db
  • Harmonic Distortion: Less than 0.5% @60W;
  • less than 0.2% @ 20W Damping Factor:>18
  • Output Impedence: 4, 8 & 16 ohms
  • Hum & Noise: >90dB below rated output
  • Power Source: 117 VAC 60Hz
  • Tube Complement: (4) KT88 + (6) 12BY7A
  • Dimensions: 16-3/8”W x 9”H x 11.5” D Weight: approx. 70 lbs unboxed
  • Original price in kit form $159.95 or factory-wired for $229.95

Back in the late 50s-early 60s, Harman Kardon manufactured a 60-watt push-pull tube powerhouse called the Citation II. It was designed by Stewart Hegeman and weighed 70 pounds. The Citation was advertised as being the world’s first high bandwidth power amplifier, going beyond the range of human hearing. This was a concept way ahead of its time and not widely accepted in 1959. The Citation II is also known for its three massive transformers (built by the Freed company out of New York), located in a straight line in the rear of the amp. (Be very careful when lifting this, as the weight is almost all back loaded, making it awkward to carry. Take care when setting it down so as to not get your fingers caught under the rear of the amp where most of its 70lbs rests).

The Citation is highly sought after in the used market today and getting one is like panning for gold in a Californian mountain stream. It takes some time and effort, but the end result is a find of pure 24K gold. My friend, Steve Willman, loaned me his restored amp for this review. Cosmetically, the front faceplate was painted brown to match the amp, and the biasing meter on the rear was replaced with one that is slightly larger. Other than that, the only other change is the modification in the rear to accommodate larger spades for speaker wire connections. All tubes tested good to excellent on my Heathkit tube tester. In return, I have agreed to temporarily part with a pair of my Dignity Audio DA08SE monoblock SET amps. Steve loves tube amps and has been eyeing these powerful 8-watt SET babies for a while now, so I guess this is the perfect time to loan them out. read more…

Grant Fidelity A-534B Integrated Tube Amplifier

Grant Fidelity A-534B Integrated Tube Amplifier

Peas and carrots, beer and pizza, cheese and burger, some things just go together. The Grant Fidelity A534B tube amp sounds so good with women vocalists that it is just like peas and carrots. Rated at 10 watts, using EL34 driver tubes in conjunction with a pair of 300B output tubes, this is obviously not a head banger’s amp. But it reaches the sublime with female vocalists of all types. But I am getting ahead of myself here.

Tube Compliment:

  • 2 Shuguang 300B, 2 Shuguang EL34B
  • 2 Shugang Chinese 12AX7s, 1 Electro Harmonix 5U4GB Output: 10 wpc
  • Weight: 60 lbs
  • Price: $1979

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Dignity Audio DA08SE SET Tube Amplifier

Dignity Audio DA08SE SET Tube Amplifier

Since its inception, Monarchy Audio has developed a strong relationship with manufacturers in Asia. Several Monarchy components are built in modern Chinese facilities, and benefit from the advances made in their latest generation of factories.1 The strong ties that Mr. Poon has developed with overseas companies gives him exposure to many different brands of equipment that are not exported to the US market. From time to time, Monarchy Audio imports a product built by an Asian manufacturer that Mr. Poon believes offers an exceptional value. Recently, Mr. Poon has been quite enthusiastic about a pair of 300B-based amplifiers that are built by Dignity Audio. read more…

Monarchy NM24 DAC/Line Stage

Monarchy NM24 DAC/Line Stage

The January issue contained a review of the Monarchy Audio M24, which is essentially a DAC and an active line-stage that is built on a single chassis. After a couple of months of listening to the M24, I concluded that that this piece offered audio enthusiasts a true taste of high-end audio reproduction. The M24 is not inexpensive by any stretch of the imagination, however it’s design allows the cost conscious audio enthusiast to replace two components, and associated cabling with one unit which is capable of holding it’s own with other comparably priced audio components. After the review of the M24 was completed I contacted Monarchy Audio in order to make shipping arrangements to return this piece. During this conversation Mr. Poon informed me that a successor to the M24 has just become available; and would I be interested in listening to it? Since I enjoyed my time with the M24 quite immensely, I was more than interested in hearing an updated version. Within a week the UPS driver dropped off a package from Monarchy Audio, which contained the NM24 DAC/Line stage. read more…

Holy Jolida, Batman! (Jolida SJ502A review)

Holy Jolida, Batman! (Jolida SJ502A review)

Specifications: Jolida SJ502A

  • Maximum Power Output:85 wpc at 8 ohms, 1KHz Rated Output:60 wpc at 8 ohms, 25Hz to 60KHz Frequency Response:(at 1 watt into 8 ohms) 8Hz to
  • 130KHz + 1dB
  • Bandwidth:15Hz to 80KHz + 3dB; 0dB 60 W 1KHz
  • Distortion THD:Less than 1% at 20 V output, 28Hz to 15KHz
  • Circuit Type:Ultra Linear, Class AB
  • Input Impedance:100Kohms
  • Input Sensitivity:600mV at 1KHz for 60 watt output-
  • Output Impedance:4 ohms and 8 ohms Negative Feedback: Less than 5 dB Noise and Hum:85dB below rated output
  • Tube Complement:2 matched pairs (4) of 6550/KT88 power output; 2 pcs. 12AX7A/ECC83 pre-amplifier; 2 pcs. 12AT7/ECC81 power drivers.
  • Power Requirements:110V-120 VAC 60Hz 180 watts-standby, 450 watts maximum (220 VAC 50Hz option). Dimensions:17 inches (43cm) wide by 1 5 inches (38cm) deep by 7.5 inches (19 cm)
  • high.Weight:39 pounds (18 Kg)
  • Price $1100 new, average used $650-$700

I just had to do it. You know what I mean – try some tube gear. I wanted to know what the fuss was all about. Was it hype or was it for real? There was only one way to find out. Besides, I thought those tubes looked cool anyway, so I took the plunge. read more…

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