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SS-4772 Ultra Stereo

"The Ultimate Stereo For Your Vintage Vinyl"

No other stereo tube amplifier offers you as many features



  • Model No. SS-4772 -30  (30 Watt Standard)

  • Model No. SS-4772 -50  (50 Watt Upgrade)

  • Ultra Linear Stereo Tube Amp

  • Point-To-Point Hand Wired

  • Output Tubes - Classic Matched Quad 6L6GB 

  • Premium 12AX7/ECC83 Preamp Tubes

  • 4-8-16 Speaker Impedance Switch

  • Classic Banana Post Speaker Connectors

  • Powered Sub-Woofer RCA Jack

  • Preamp Out Jacks

  • Headphone Jack With Speaker On-Off Switch

  • Phono1 - Phono2 - CD - AUX Inputs

  • Separate Channel Volume & Tone Controls

  • 3 Band Tone Stack

  • Presence With Loudness Boost


MSRP: $2665.00







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The FRENZEL SS-4772 Ultra Stereo was designed as a stereo amp platform for all your audio gear. It will transform you back to the time when tubes ruled the audio world.  If you love the vintage high fidelity tube will love this amp. It is powered by a Quad of 6L6GC's paired with ultra linear transformers for the purest tones possible. The power supply uses a solid-state bridge rectifier for tight bass response.  The preamp section uses classic 12AX7/ECC83 premium tubes and has many unique features including DC voltage on the filaments to eliminate hum and noise, separate volume controls, tone stack controls, presence controls and loudness edge boost controls for each channel which allows you to fine tune the sound just the way you like it. Two phono preamp inputs are provided to allow you to use a player with  magnetic cartridge RIAA output or a player with Line Level output. Multiple RCA input connectors are provided on the rear panel to interface with  the output of your Phono, CD player and AUX items such as Ipad, Iphone, computer or Entertainment Center.   Preamp out jacks are provided for recording or driving another amplifier. The amp comes standard with a retro style perforated cage cover which provides excellent ventilation for the tubes or if you prefer the open chassis look to show off the tubes, the cage can easily be removed. 

Standard Features:

  • Input Connections - RCA Input L - R jacks for  PHONO (Line Level) - PHONO(Magnetic Cartridge), CD/DVD/TV - AUX. The AUX may be used for IPAD/CELLPHONE/COMPUTER type devices.   

  • Classic PRESENCE controls for extended highs with Loudness Edge pull switches for  more dynamic and less compressed tones.  

  • Dual Volumes with Dual Tone Stacks, and Presence controls  for precise control of tones. 

  • Class AB  ultra-linear 6L6GC's for classic warm vintage tones. 

  • Ultra-Linear output transformers for the purest high-fidelity tones.

  • Heavy duty power transformer with "copper flux band" to eliminate 60 cycle hum radiation and noise.

  • Choke  filtered high voltage with 5 filter capacitors to eliminate 60 cycle hum and noise.

  • DC Voltage on preamp tube filaments to eliminate hum and noise.

  • ​Input and Output Jacks isolated from chassis for the lowest possible  noise, and hum.

  • Rock solid point-to-point hand wiring with military style tie-wrapped wiring harnesses for long life and reliability.

  • High quality commercial grade parts  including heavy duty transformers, low noise tubular polypropylene capacitors, metal film resistors, Micalex sockets, Neutrik jacks. All parts are rated for commercial high use conditions. Wherever possible we use parts made in the USA.

  • Star ground system to eliminate induced current chassis noise.

  • Speaker Impedance Selector Switch for each channel  allows you to use 4, 8, 0r 16 ohm speakers.  

  • Heavy Duty Three Way Banana Type Speaker Jacks 

  • Powered Sub Woofer RCA Output Jack

  • Preamp Output Jacks for recording or driving another amplifier.

  • Headphone jack with switch to turn speaker ON and OFF.

  • Power Output 30 watts per channel @ 4, 8, 16 ohms 

  •  Ultra fast high voltage solid-state bridge rectifiers provide reliability and dynamic bass. 

  • Standard IEC plug-in three prong grounded power cord. 

  • Classic polished aluminum knobs.  

  • Vintage jewel pilot light and classic toggle switches. 

  • Standby switch to turn off output tubes during warm-up to prevent  power surges and to extend tube life when amp is not in use.

  • Tube complement: 6 - 12AX7/ECC83's, 4 - 6L6GC's

Electrical Specifications: 

  • Frequency Response: 20 to 20,000 hz

  • Harmonic Distortion: Less than 1% 

  • Input Impedance:  PHONO 2, CD, AUX - 1 meg,

  • Input Impedance PHONO 1 - 47K (Magnetic Phono) RIAA - MM, MC

  • Input Level:  PHONO2  - CD - AUX -   1.0 V RMS (Line Level) for full output   

  • Input Level PHONO 1 (Magnetic Phono RIAA - MM, MC) - 4 MV RMS for full output

  • Output Tubes - Class AB Push-Pull 6L6GC's - Fixed Bias

  • Output Power: 30 Watts per channel  (50 Watt Upgrade)

  • Output Impedance: Selectable 4 - 8 - 16 ohm

  • Power Consumption: 120V 60hz - 240VA


Physical Data: 

  • Retro Vintage Cage - heavy duty lightweight steel mesh cage provides protection and excellent ventilation for tubes. Comes with easy carry Fender style strap handle. Overall Dimensions - 17" Wide x 12" Deep x 10" High 

  • Chassis Dimensions - 17" Wide x 10" Deep x 3" High. (Add 6" clearance for tubes)

  • Weight - 20 lbs. 

  • Chassis - Heavy gauge aluminum with welded corners.

  • Front Panel Controls - Input Selector Switch, Left & Right Channel  Volume, Bass, Middle, Treble, Presence, Loudness Boost Switch, Speaker ON/OFF Switch, Headphone Jack, Standby Switch, Pilot Lamp, Power Switch

  • Rear Panel Controls -  Power Cord Connector, Fuse, Left And Right  Channel  - Speaker Output Connectors, Speaker 4-8-16 Impedance Selector Switches,  Sub Woofer Output Connector, Preamp Output Connectors, Input Connectors, Chassis Ground Terminal

  • Chassis Views - Sample Images -  Tubes, Panels & Wiring Design May Vary Depending On Upgrades


Front  Control Panel View With Cage Cover Removed

Frenzel SS-4772 Super Sfereo Rear Panel

Rear Control Panel View

Frenzel SS-4772 Super Stereo Wiring

Point-To-Point Hand Wiring - Military Style Cables

Upgrade Options:

These options allow you to  customize your amp to meet your special individual requirements.

MUSICAL INSTRUMENT - MICROPHONE PREAMP -  Adds musical instrument- microphone level preamp (300 millivolts). Allows you to play guitar, bass, keyboard or sing  along with the music on your Phono, CD and AUX inputs.  Instruments are connected via standard 1/4"  jacks  installed on the  front panel Each Jack has its own volume control. Add $195.00.


50 WATTS  POWER OUTPUT -  Increases output power to 50 watts per channel.  Add $300.00. 

KT88 OUTPUT TUBES - upgrade replaces classic 6L6GC output tubes with KT88's known as the "King of Tubes" for the ultimate ultra linear dynamic performance. Upgrade includes heavy duty Micalex high voltage sockets with hold-down clamps to keep tubes fully seated in their sockets.  Add $345.00.



Point-To-Point Hand Wiring View

I just want to say " WOW WOW WOW" After a few days of listening to records on this amplifier, the sound coming out of my pioneer HPM"S is so smooth and warm.  The customer service is in the highest standards. They kept me informed during the build of the amp. Photo of my setup below. Thank you. Willy S. (Colorado)

Jim - I am sitting and listening to your amp- it is all warmed up and playing a new "Tommy" LP.   The amp sounds just stunning: very powerful and dynamic, detailed, open, huge bottom end.  I will say that bypassing the presence and treble controls raised the volume and lifted a veil.  I have listened to and owned lots of amps and I am amazed by the value in this one- it could compete with  amps costing three times as much.  Once warmed up, it was immediately and completely involving.  Please feel free to use me as a reference for this fine amp.  Best regards, Jeff S. (New York) 


Dear Frenzel Tube Amps, Thank you very much!!! I received it today, it's amazing!!! Sounds great!!! Will recommend you to my friends.  Klepatskayavi (Russia)  

SS-4772  Hello,  I am writing about my Frenzel SS-4772 Super Stereo that I purchased a few months ago.I thank you so very much for such a well designed and built amplifier! And how thoughtful were your updates on progress of the build of my personal amp. Impressive.  Before upgrading to Frenzel, I was using a Crown PA amplifier. I liked the Crown's high power/dynamic headroom including at the lower frequencies. I was looking forward to cleaner reproduction/sound with the Frenzel tube amp, paired well with my turntable, but didn't know if the 30 watts per side would be sufficient with perhaps some fatigue at the bass frequencies. Well, the Frenzel is AMAZING!
Clean sound, clarity, 'Presence' were even beyond my expectations. One doesn't realize how 'muddy' sound from even a higher end high power class-D amplifier is (even with good equalization) until compared with the quality of a Frenzel tube amp! And the accurately rated wattage was More than sufficient with no amp fatigue at all. The bass reproduction of the Frenzel is bold, strong and precise! WOW, audio came "ALIVE"! [Even YouTube sounds good, certainly better! LOL] What a pleasure it is for me to support an American company in engineering and build! Frenzel is a wonderful example of USA ingenuity and quality fabrication. Jack N. (Ohio)

Thanks Jim, The amp sounds absolutely amazing, this is the best sound I ever had at home. Fantastic! Darek O. (California) 

Dear Mr. Jim Frenzel, Your SS-4772 Super Stereo amplifier is nothing shy of epic. I am so thrilled, so happy, so blown away by your amplifier.  Thanks for integrating old school technology with new school systems compatibility.  This thing works great with my Apple iMac, my Samsung BluRay DVD, and my Samsung TV - and with no preamp required for these devices! It also works fantastic with my old school Technics 1200 Mk2 turntable.  My pristine 70's vintage Pioneer CS-99A speakers did a instant hand shake with this amp as if it was an old long lost friend. I am so pleased with  how this amp clearly transfers  digital iTunes music to a whole new world of old school analog tube sound.  Maybe it's the old school technology with a tiny bit of new mixed in to it... whatever the case my be, you have hit the nail on the head.  You have designed an old school analog tube amp that will transform the sound of digital recorded music to the way it should sound.  I'm amazed, I'm blown away, and I am so happy I chose your company to build my amp.  I received my amp last Friday. I have locked my doors, turned off my phones and email, and signed myself out from the outside world for a week while I process the prowess of this amp. A great super clean sounding tube amp at a price I could afford. Way to go!  Sincerely, John K. (Florida)

Hi Jim, Thank you again for this wonderful amp. The best I ever had. I sit now and listen for hours, something I haven't done in decades..Darek O. (California)
Hi Jim - I just wanted to let you know that I have received the 4772 amp today. Man, does it look beautiful!!!To me, it is a piece of art, just like the other amps I have from you. I was impressed by it's size, it is bigger than I thought and sometimes bigger is better :-) It seems to have survived the journey over the Atlantic well. I am really happy Jim, thank you so much for building it for me! You guys at Frenzel are the best. I will get back to you for more orders soon..(thinking of the twin deluxe and the champ sportster at the moment..and I have some ideas that we might get to work) and oh yes, that mic-preamp we were discussing some time ago! Only a fool would be satisfied before he have all the products you have to offer. :-) Honestly, your amps warm my heart, I am not just buying an amp when I buy from you, it's so much more and so much better (and definitely more value!!)! Once again, thank you so much!! Anders H. (Switzerland) 

Love the amp Jim, great sounding piece of equipment. Nothing sounds better than a Stereo Tube Tape Echo into a Stereo Tube Amp! I have found tone heaven. Thanks again, Kevin M. (Nebraska) 

Hey, thanks for making such a great amp and excellent customer service. Jeb. B (North Carolina) 

Jim,   Christmas in May!  I received the amp last Friday and unpacked it Saturday.  It is absolutely the most beautiful piece of stereo equipment that I have ever seen...   George O. (Texas)  

Hi, I ordered a used Frenzel SS-4772 amp from the original owner in New Hampshire and received it on Tuesday. I couldn't be more happy as I have been using a China made amp which sounded good I thought, but man was I wrong. I could not recommend this amp enough. If someone is thinking about ordering this amp then don't worry, it is a great amp. I haven't turned on my TV in 3 days just listening to this great amp. My system is a Sota Comet turntable, Soundsmith Othello cartridge, Frenzel 4772 amp, Magnapan MG 1 Improved speakers. For those with planer speakers this amp has plenty of power and will blast you out of the house if you turn it up. Thanks for the great amp. Greg 


Jim,  - I’ve had this amplifier (SS4772 w/KT88 upgrade)  for approximately 1.5 months now and I can confidently say it’s an exceptional value.  Not a hum buzz or anything but clear warm sound.  I simply love the amp and everything about it.  Your quality and customer service is second to none.  Take care and keep up the great work!! Thanks to Jim and crew...nicely done. Regards, M. Potter (Michigan)

Hi Jim - Received my new amp in good condition. Couldn't resist taking off back cover to check out the wiring. Very impressive. Have amp hooked up to some big old speaker cabinets that my father made back in the 50's or 60's. They have big 15" Jensen speakers, tweeters, cross-over networks, etc. Old school. I've refinished the cabinets, which were in storage for decades, and they look pretty good. Have acquired a turntable and dusted off my old vinyl jazz records. The whole setup sounds great - can't beat the warm tone of vinyl records and a tube amp! Anyway, amp is great. Thanks for producing a quality product. Phil T. (Florida)

Hi Jim - Hope you are well, many thanks for building this awesome amplifier for me, it arrived safe and sound thanks to the excellent packing. I had never heard one but took a chance due to the great reviews for your amps. on your website and elsewhere. I'm very glad I did too, the power, tone and clarity is just amazing and I can't believe how effortlessly it drives the Kef Chorales, they've never sounded so good even without new crossovers!  The Marantz CD63se sounds fantastic through the amp. I'm now thinking of buying a Musical Fidelity M1 DAC to further improve the cd analogue output for the amp., I think it deserves the best possible signal. Nice to see the 1% tolerance resistors that's real quality, they look like 2w carbon to me? Everything looks just as good inside as out, very neatly laid out, you are right to be proud of your products! Thanks again for building it for me, I wouldn't hesitate to recommend you to friends and family. Pete C. (United Kingdom)   

Jim, I purchased my tube stereo about 5 years ago.  I have wanted to give a review but since it was so hot in Hawaii, I decided to save my beautiful Tube Amp for later. I finally moved to Oregon and unpacked my Kt-88 Tube Stereo Amplifier with rectifier tube. I run it through a pair of Concept CE-1 speakers.  I listen to 80's hard rock  Ozzy and new bands like Halestorm. I was listening and checking out the amp and then i saw the presence pull for edge. This made the vocalist like they were standing right in front of me singing, I was blown away with the incredible live like sound. I was using a vintage ipod 80 gig with charging input not the headphone output, which does not sound as good as using the charging style  to rca. The sound is big and I hear so much more and feel the bass. Before making my decision on purchasing an amp. I looked at quite a few Tube amplifiers. Most offered not much of anything in the way on control features and all the small amps  were on circuit boards and had mixed reviews. The amps offered by other companies were small and started around a grand on up and were on a circuit board. I also was looking for used Tube Stereos. I came to the conclusion I didn't have time nor want to repair my new or used tube stereo. I made my decision and purchased a Frenzel Tube Stereo with KT-88 tubes. If you looked at other Manufacturers amps with Jims options you would pay about 2 Thousand on up. Jim offers an incredible product all hand wired(no circuit boards).  If your looking for a tube Stereo, look no further. Jim makes an incredible amp for the money. He ships his amps in a 2 boxes with about 4" of foam style blocks all the way around the product and the product is in its own box. Thats 2 boxes and I received my product in Hawaii in prefect condition. Jim does an A++ job on all his amplifiers and packing. Jim, Thank you for the Awesome Stereo.  Kirk Greenman  (Oregon)

Hi Folks at Frenzel I wanted to wait till I let the SS-4772 Stereo Tube Amp get a good burn in on the tubes. So unboxing and hooking up the cables I was impressed Ok right out of the box, let the tubes warm and let the DAC send it signal from my laptop for some tunes it was close to what I wanted out of my stereo tube amp. A few tweaks with the settings and boy I don't need to let the tubes burn in, love it. It takes every kind of music played on it!!!, Thanks, Folks! The depth of the music is what I was looking for!  Richard Griesser  (Texas) 


Hello Jim, Here is my review of the Frenzel SS- 4772 stereo amplifier I purchased back in March 2018. This amp is well worth the thousand dollar investment easily. If cared for properly, this stereo amp could provide a 100 years of service to its owner and or owners. This is a unique piece of equipment. It's tube, hand built, and hand wired, unheard of today. This is the only modern tube amp I am aware of, that provides a full set of tone controls. It gives the music I listen to the type of musical tones I like at different volume levels. I upgraded to the KT88 tube layout. Being a powerful amp it really brings the music to life. The amp has that great musical tube sound.  I like the feel of the control knobs. I like the nice orange glow of the tubes inside the metal protective cage at night. And may I mention this is a really nice amp to look at. Everything about this amp is solid. No cheap engineering here. When my stereo amp arrived from the Frenzel company, the first thing I noticed was the phenomenal packaging. This unit could be dropped from an airplane and still survive. Packaged with foam squares glued to the inside box. That was different, the first time I seen that type of packaging. For any of the readers of my review. If you are looking to buy a 2 channel stereo amp for your music. In my opinion, I feel this is one of the best  stereo amplifiers  you can buy out there at this price. Drop the spare change. This is a lot of amp for the money, Frenzel did a good job of keeping the cost down at the same time providing a great product. Good Job Frenzel, Thanks, Jim - Frank C.  (From,  L. A. California)   

Hello, I received the amplifier, set it up and was blown away. The headroom on this amplifier is outrageous. Thank you Thank you Thank you. Gratefully yours, David H. (New York) 

Hi Team, Ok I have spent some time with my SS 4772, from the time I opened the excellent packaged boxes, I have been completely satisfied. Money well spent. This has pumped new life into my 33 year old Klipsch Cornwalls. Has made listening to music enjoyable again. I have played CDs, LPs, favorite music, new music, old music I heard for years. Still can't believe how great this amp  sounds. I hooked the Sony again, just to compare what I had been listening to. I would/will/do Recommend your amps to anyone who loves music. for those living with digital age of MP3s downloaded files, blue toothed to an invisible sound system, you will not believe what you've been missing. The 30 watts is more than enough, ( probably the 15 watt amp would been fine ) As guitar player I will be a returning customer, ( may need to sell some old fenders first)/ Tony C. (Arkansas) 


 Hello Guys, Just hooked it up. Awesome right out of the box.  No frills, just performance. The way it should be. Thnx Bill H. (Rhode Island) 


Thanks Frenzel! Received 2/22/21, your bad storm down there didn’t delay it too much. It sounds great and I have been enjoying old lps I haven’t played in 20 years. Bill L. (Pennsylvania)  


Hi Jim, Its been long overdue but as promised here is my review. I hope it gains you more business. 

Your passion for vintage electronics and functional perfection is unmatched. Back in December 2019 I ordered my custom SS4772 after years of gawking at Frenzel's website. Jim was great to work with and customized my unit with an Aux2 input so I could play guitar through a Frenzel Rocker 800Z stereo preamp while playing any other input. Think turning some vinyl or watching a live YouTube concert while playing along. It rocks! Although this review is mainly of the SS4772, it's only due to my inability to find sufficient guitar time where I could turn it up to 11 without the wife and kids sleeping joys of a Covid world.  About 10 weeks later I received my amp in its bulletproof packaging. Box within Styrofoam within double thick cardboard. Very impressive!  With that being said, my family and I use the SS4772 nearly everyday for 15 montha. Our setup is simple, consisting of a 24bitDAC digital to Analog conversion box from our LG OLED TV and a late 70s Sony PS-4750 turntable with Ortofon Blue stylus while outputting through a pair of KEF Q350 Bookshelf Speakers. For a few months we also drove a pair of Gen 1 Bose 901s, both sounded absolutely fantastic, only swapped due to space constraints in our family room. Regardless what input we drive the SS4772 with, it sings and rips everytrack. Even without a subwoofer or floorstanding speakers the bass is unlike any stereo tube amp I've heard before. I'm truly blown away at the EQ and frequency range. The really shined with the Bose 901s since the vocals get muddy on the KEFs if the bass is too intense. In other words, the single woofer + tweeter construction of the KEFs can't handle all the bass while keeping everything clear. A little turn of the bass knob and it's crystal clear sonic heaven. Jim offered to install a sub out if I send the SS4772 back but I couldn't go a week without it. We have plans for futures expansion but the SS4772 will always be at the center of it all. Best regards, Ian Engelberg (Pennsylvania)   


Hi Frenzel, The amplifier sounds excellent!! Thank you! This amplifier has become my favorite of all my amplifiers. It is an excellent match to my Klipsch RP-8000F speakers. Again thank you. Sincerely, Gates H. (Colorado)  


For more reviews please check our Customers Reviews page.  

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