Sound ValvesM60 usedSound Valves M60  Tube Monoblock Amplifiers, Like New in Box**Please be sure and check out our newly launched website with additional items for sale** Valves M60. Sound Valves is the name taken after Dynaco stopp...1450.00

Sound Valves M60 Tube Monoblock Amplifiers, Like New in Box [Expired]

no longer for sale

**Please be sure and check out our newly launched website with additional items for sale**

Sound Valves M60. 

Sound Valves is the name taken after Dynaco stopped selling DIY kits in the 1990s and set up shop in Columbus Ohio. The M60 amplifier could be considered the next version of the Dynaco MKIII. The parts used on these amps, aside from chassis and main board, follow the Dynaco design principal of being readily available – most parts are available from either Mouser or most tube suppliers. There is great support out there for anything Dynaco and that includes these amps. Any place that repairs or mods Dynaco equipment can work on these amps.

The M60 audio circuit topology is a four stage, single channel power amplifier. The front end consists of an all triode, Class A gain stage, phase splitter, and low impedance drivers. The output stage uses 6550 tubes and operate in triode or ultra-linear mode selected by a switch between the output tubes and transformers (NOTE: Manual states the switch can only be used when amp is off). In triode / ultra-linear mode the first 17W / 30W are pure Class A, switching to Class AB1 for a maximum RMS output of 30W / 60W. Below is the information from the manual.

ULTRALINEAR: 60 watts (into 2, 4, or 8 ohms). THDIIM (60 watts RMS, 20-20kHz): <0.5%; @1kHz: <0.1%. Frequency Response: 20-20kHz, +0/-.25dB. Full Power Bandwidth: 5-75kHz, +0/-3dB.

TRIODE: 30 watts (into 2, 4, or 8 ohms). THD+N (30W RMS, 20-20kHz): <0.8%; THD @1kHz: <0.2%. Frequency Response: 20Hz-20kHz, +0/-0.5dB. Full Power Bandwidth: 6-60kHz.

GENERAL: Input impedance: 300K ohms. Output impedance: <0.70. Max.power be­ fore clipping: 70 watts. Dynamic headroom: 1.2dB. Signal-to-noise ratio (@60W): down better than 95dB. Input sensitivity: 1.2VRMS for 60W; (200mv for 1 watt; l.0V for 30 watts triode). Gain: +22.4dB (20 dB negative feedback). Polarity: non­ inverting.

USA Tubes: 2-6550A, 1-12AT7/6201, 1-12AU7/5963.

Case Dimensions: 9-1/2"W x 7-1/2"Hx 11"D (12"D including binding posts). Net Weight: 32 lbs.


Circuit Features:

• All-triode front end. Triode switchable output tubes.

• Massive custom-wound power/output transformers-exclusive custom designs by SV's Harry Klaus.

• Polypropelene signal caps. 1% metal film resistors. Hand-matched gain resistors. Mil-spec FR4 boards.. Shielded silver-Teflon wire between jack and board.

• Class AB1 operation-pure Class A to 30 watts (ultralinear); Class A to 17 watts (triode). Balancing trimmer on phase-splitter for ultralow distortion.

• Quality USA tubes: hand-matched, 48 hours burn-in. (May be internally reconfigured for EL34 or 6L6GC.)

• 2-ohm impedance load support for exotic speakers

• Visual bias adjust for each output tube. Instantly indicates tube status-shows when tube changes from Class A to AB, and eliminates need for matched pairs. LED indicator switch has center "off" position.

• "Soft Startup" for extended tube life. FET regulated power supply for front end tubes; regulated heaters.

• 2, 4, or 8 ohm selectable speaker impedance via four rear panel binding posts, "pyramid" configured for quick impedance changes via dual banana plugs.

• Ground lift switch for optimized signal-to-noise ratio plus IEC power socket with 14-guage power cord.

• Superb low volume level performance. Accurate musical colors, tonal timbres, and sound staging.

Cosmetic and Convenience Features

• "Classic Chrome” plated steel chassis and bottom; additional internal supports for extra rigid platform.

• Stylized "Ultra-Vent ™" perforated cover-cage (included)

• Front panel tube bias LED status indicators

• Deluxe GOLD input signal jack and 30A 5-way binding posts

These units came to us from a collector that had dozens of amps so I suspect they got little to no use.  They look new and the tubes look barely used.  

We checked all tunes in our professional tester and they passed with flying colors.  The capacitors were also checked for performance and leakage and also passed.  It was driven to the full rated power without excessive noise or distortion.  They are like new and ready to make someone happy. 


This item will be professionally packaged and insured for safe transit to your home.   

If we don’t have the original manufacture's packaging, we use heavy duty double ply corrugated boxes with Instapak expanding foam custom inserts.  In many cases this has proven to be better than the original packaging.  We also use high quality fiber reinforced tape to seal our packages.  Lightweight items will be bubble wrapped and shipped in a high-quality box. 

This item is available for pickup in Ridgewood, NJ or Union Square, NYC (with convenient parking in the building).

NJ Residents or anyone picking up without a resale certificate will need to pay NJ Sales Tax.

Use the Buy It Now button and we will cover the PayPal fees.

Thanks for looking and be sure to call or text 646.852.2073 with any questions. 

Please also be sure and visit our Audiogon e-store to see the rest of the items we have for sale

**And be sure to check out our newly launched website with additional items for sale**



Skyfi Audio is a small startup business specializing in the purchase, reconditioning, and reselling of select high end audio equipment.  We only buy equipment the we admire and are passionate about. No mid-fi, no gimmicks, and no junk. 

Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. If it does not meet or exceed the original manufactures specifications, it will not be sold.  We are very selective about the equipment we purchase, focusing on mostly analog, high-build quality, American, and European built units.

Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Project, and Sony ES, we have access to OEM parts, service, and support.  If you are local and are looking for any new equipment for the above-mentioned manufacturers, please drop us a line as we can arrange both sales and professional installation in the tri-state area


We do not accept or review any offers that do not go through the official Audiogon system. We have too many items for sale and its nearly impossible to keep track of offers outside of the official system. Please don’t message, email, or text any offers. 

If you do not see a “Make an Offer” button, it means we are not considering any offers on that item.   


We prefer working through PayPal, which allows you to use a credit card or bank transfer. We do not charge extra for any payment fees if you purchase the item at the asking price.  You can also send us a personal check (which will need to clear before shipping), certified check, money order, or wire transfer. International clients without access to PayPal should use a bank wire transfer. 

If you are picking up an item, we do not accept PayPal.  You must pay in person with cash, certified or bank check, or wire transfer.  If you make a PayPal payment and are picking up the item, it will be returned. 


We accept trade-ins of equal or lesser value under certain conditions.  Simply ask and let us know the exact model, condition, and the accessories that are included.  Such as the original box, remote, manual, etc.  We will only consider high-end equipment from mainstream manufacturers such as McIntosh, Mark Levinson, Audio Research, Krell, etc. and will typically pass on displays, projectors, receivers, dated processors, and mid-fi equipment of any type.  We will offer a fair value for your equipment, but keep in mind we are running a business and will need to be able to resell the equipment at a profit after investing a great deal of time and resources in testing, certifying, repairing, cleaning, and packaging the incoming equipment.  If you are looking for top dollar we suggest attempting to sell it directly to an end user on your own.

SELL US YOUR GEAR (Working or Broken)

We will also purchase your used or broken gear and arrange pickup if you are in our local market.  Just drop us a note for a quote but be sure to include the condition and what is included. 


We are currently operating from a residence in Ridgewood, NJ.  You are welcome to make an appointment if there is a piece of equipment you would like to see in operation before or after purchase.  We have a well-equipped, dedicated listening room with tons of equipment of all makes and models.  We are not a store, so please don’t make an appointment if you are just curious as to how a speaker or piece of equipment sounds.  In essence, no tire kickers please.

If you are in NYC and cannot make it out to Ridgewood, we can arrange pickup in Union Square (14th Street) after the purchase.   You can call or text 646.852.2073 with any questions or to schedule an appointment.  We can also arrange to install, calibrate, and tune the gear in your listening room if you are local to the area.  This is super useful when purchasing large speakers or heavy amplifiers.  It is also great for ensuring your new turntable is setup correctly in its final resting place.  

Thanks for looking and please send us your email address if you would like to receive a list of the equipment we receive from time to time.  We promise not to bombard you with junk email.   


skyfi member since January 2012  Verified Dealer
Last 12 months
Items from this seller