SS-4772 Ultra Stereo

"The Ultimate Stereo For Your Vintage Vinyl"

No other stereo tube amplifier offers you as many features and custom upgrades! 

  • Model No. SS-4772

  • Ultra Linear Stereo Tube Amp

  • Point-To-Point Hand Wired

  • 30 Watts Per Channel

  • Matched Quad Classic 6L6GC Output Tubes

  • Premium 12AX7/ECC83 Preamp Tubes

  • 5U4GB Heavy Duty Rectifier Tube

  • 4-8-16 Speaker Impedance Switch

  • Classic Banana Post Speaker Connectors

  • 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

  • Custom Upgrades Available

MSRP: $1865.00


Sale Price  $1398.75




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 heavy duty 5U4GB for the warm compression tones that only a tube rectifier can produce. 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 output level. 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.   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 be easily 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 polypropylenes 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

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

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

  • Classic Heavy Duty 5U4GB Tube Rectifier 

  • 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, 5U4GB  

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:  PHONO  - 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

  • 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, 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 View

Custom Upgrades

These upgrades 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 $145.00.

ss4772 instrument upgrade panel.jpg

TRIODE/PENTODE MODE SWITCHES - Dual toggle switches on rear panel switch left and right channel output tubes from Class AB pentode high gain mode to Class A triode low gain linear mode. Add $100.00

PREAMP INPUT - POWER AMP OUTPUT EFFECTS LOOP   - Preamp out  RCA jacks and power amp in RCA jacks  provide Effects Loop access to amp for recording or playback. Can also be used for studio effects units like  Panoramic Equalizer, Reverb, Mixers. Switch on front panel to turn loop ON and OFF.  The Power Amp Input RCA JACKS are always active and allow you to mix your audio with other devices, preamps, mixers, tape decks.   Add $125.00

240 VOLT POWER TRANSFORMER - for operation outside the USA  where 240VAC line voltage is used. Add $55.00

100 VOLT POWER TRANSFORMER - for operation outside the USA  where 100VAC line voltage is used. Add $55.00

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 $175.00.

DUAL RECTIFIER POWER SUPPLY - Power supply has both tube rectifier mode for smooth compression on peaks or a FRED  high voltage solid-state rectifier mode for sharp pick attack and dynamic bass. Switch on rear panel to select mode of operation. Add $50.00 


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)  


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)


For more reviews please check our Customers Reviews page.