Information please dynaco stereo 400 audiokarma home. If only because some 400s left the factory with very wrong part values on the pc28 boards. The original dynaco driver met these needs with a single pentode gain stage at the input, followed by a simple splitload phase inverter to drive the output stage. Stereo 70 driver board 7199 board replacement modules. Free shipping on many items browse your favorite brands. The primary mods that i did all seem to be listed here, dynaco repairs for pc28 amplifier boards. The dynaco stereo 120 was the first powerful 60 wattschannel transistorized stereo power amplifier in wide production. I dont have a good reason for it, just didnt like it. These models and the st416 each contain a pair of dynaco pc28 amplifier pcbs one board per channel. Vintage dynaco stereo 70 st70 stereo tube amplifier no tubes.
This board is a must for any serious restoration of the dynaco stereo70 to full stock condition. This board shouldnt be doing to the amp what it is doing. Dynaco st400 st410 st416 new pc28 driver board complete. Restoration module this is an exact replacement for the original dynaco pc3 board fabricated from milspec materials. Overview these power amplifiers can often be found in online auctions or local classifieds. Hard to find parts including dynakit original dropin replacement components typically ship within 24 hours of ordering. The dynaco stereo 416 is a basic power amplifier employ.
I used to do freelance work for the company that bought out all of the dynaco parts. In addition, we offer an array of new select dynakit classic vacuum tube. Stereo 70 driver board 7199 board replacement modules a. Dead channel fix dynaco power amps by kevin boales january, 2002 applies to.
They sold tons of the black box 410 i built the driver board test set pc28 and tested thousands of those boards. One stop shop for all things from your favorite brand. Anyone doing these will certainly have a much more robust 400 and likely better sounding. The driver circuit had a single 7199 pentodetriode tube per channel, and. If the dynaco st70 is great, then the heathkits are world class.
Lots of power, but the preamp has horrible damping, and the amp was too tubie for my taste. While there are many driver boards available for the dynaco st70, most follow the same common formula. These amps smoked the dynaco from the beginning of the bandwith to the last and final note. Here at dynakit you will find the right parts to restore, repair or upgrade your original dynaco vacuum tube amplifier. Vtg dynaco brochure stereo 150 amp st150 amplifier dynakit spec sheet original. Founded by david hafler and ed laurent in philadelphia, pennsylvania in 1955, dynaco was an american hifi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components its best known product was the st70 tube stereo amplifier. Dynaco st70 ccs 12ax7 12au7 complete assembled driver board. First is our stereo70 upgrade system on board sob a complete amplifier on pc board.
Vintage dynaco dynakit st70 stereo power amplifier. I then had the urge to try this schematic on a pair of heathkit w7s. My uncle had the stereo 120, pat4 preamp, fm3 tuner, and a25 loudspeakers. Dynaco st 150 vintage amplifier works great original owner.
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