Dynakit MKIII / Dynaco MARK III Monoblock Tube Amplifier Pair (MK III) #1

Each amplifier is equipped with the Dynakit "bias balance control" feature. This permits equal biasing and then further balancing of the bias between the individual output tubes for enhanced sonics, extended tube life and higher overall reliability. Bias is coarsely adjusted first using the original 10k bias pots. Then the balance is adjusted, this is for equalizing the current between each pair of output tubes. These secondary balance adjustments are made using the additional balance pots and adjusters which are installed conveniently behind the front octal sockets. The adjuster is very discreet and is accessible at the center holes of the already existing front octal sockets. Full easy to follow bias setting instructions are included.

These amps feature Upgraded Premium Dynakit 80/40/30/20uF multi section capacitors which are rated for 550V (600V surge) and use four discrete (individual) caps inside the metal can style enclosure.

Each amplifier has a genuine Dynakit P-782 power transformer plus a an A-431 Output Transformer - The original (vintage) transformers are inarguably excellent, but they were designed to operate on 117 volts (think 1950's). Today's household AC current is often near and occasionally higher then 125 volts, so the use of a "step down" or "bucking" transformer is necessary to reduce the voltage down to a safe operating level for any vintage amp having its original transformers. These modern Dynakit transformers are manufactured to work from standard, modern 120-125 volt household AC current. They operate cooler, produce less distortion and outperform vintage transformers in every category. These transformers were reverse engineered from the original designs using many modern manufacturing technologies and superior insulations. These are super high quality USA made transformers that meet and exceed every aspect of the originals. There's more......if there were some sort of "magic" in cloth covered leads, Dynakit would have certainly insisted on using them. The truth is, there's simply no magic in cloth covered lead wire. There's nothing wrong with cloth leads, they were the the standard of the time, but in any comparison, these new transformers are better than those old originals. Modern advancements in materials, combined with traditional methods and better technologies used in the manufacturing has resulted in absolutely superb transformers that produce improved sonics and cleaner power. These transformers provide less distortion and increased reliability. This is not a 50 year old amp and is not pretending to be one. This is a modern amp based on a ingenious and very successful 50+ year old proven design. An inrush current limiter is incorporated into the AC mains to gently apply power during initial start up.

The bias and power supply features KEMET's PEG124 electrolytic capacitors with very long life, rated up to 27,500 hours at +105°C with outstanding electrical performance. The capacitor has a polarized all-welded design, tinned copper wire leads, a negative pole connected to the case, and a plastic insulation. The caps have been further shielded to prevent grounding between the case and the chassis or other components. The leads are also insulated for safety. The under chassis resistors are by Panasonic, Dale and TE.

All of the wiring is 20 AWG USA made wire and is carefully and tastefully routed and secured in the chassis. All soldering was done with Kester 60/40 rosin core.

Of course the amps have the Genuine Dynakit Shielded choke #C-354 for extra quiet operation.

Upgraded with Gold Plated Banana Jack binding Posts and set up for 4 and 8 ohm output. (no 16 ohm terminal)

The amps have a heavy duty C&K dust/debris proof sealed body slide type power switch with a 6 amp 10,000 cycle rating.

Identically matched JJ KT88 Tubes, tested and analyzed using the ROE computer tube matching system - one of the best rated KT88 tubes on the market. Ordered brand new as a matched quad just for these amps. The tubes are unlabeled & unmarked. These were plucked from a special case of select JJ KT88 tubes that was originally sold & shipped to a West Coast manufacturer intended for private labeling to be used as the OEM tubes in their high end production amplifiers. These are very clean and industrial looking tubes and sound incredible. These tubes were hand selected, tested and graded, these were a great find! The original MKIII amps came with KT88 tubes and then some years later in production Dynaco began using the 6550 tube. These amps will run either tube with the only requirement being to reset the bias for the different tubes.

Test matched and sweet sounding pair of true NOS vintage RCA 6AN8A tubes with original boxes. (some photos may show GE tubes being used)

New Tung-Sol 5AR4 / GZ34 rectifier tubes with their original boxes

3 Prong Grounded Power Cord

Genuine Dynakit mirror Polished stainless steel chassis with the satin black covers and custom made solid aluminum labels.

These amps were designed and built to be a true identically matched set. 

These are modern, brand new amps made to operate from standard (USA) 120-125 AC current. You do not need a voltage reducer to run these amps, just plug them in and go. 

These amps sound mesmerizing, the cleanest and most articulate soundstage I've heard from the Dynaco lineup. Driving a large pair of horn loaded cabinets with 12" woofers these amps bring the room to life effortlessly. The vocals and strings are almost disturbing. I've explored every genre from jazz to classic rock and simply don't want to shut the amps off. Even after several hours of moderate level listening the transformers are simply warm to the touch. The bass response is incredible, the extra capacitance was certainly worth the investment. 

The amps shown in the photos are the amps you are going to receive, nothing else in the photos is included but may be available in other listings if you're interested.

The sale is for the two MKIII amps, the tubes and the covers for the amps.