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Dynaco ST-70: A Timeless Classic - Audiophile Nirvana
https://www.audiophilenirvana.com/audiophile-equipment-reviews/dynaco-st-70-timeless-classic/
Vacuum Tube Audio. Perhaps the most famous and enduring modification to the Dynaco ST-70 was created by Roy Mottram of Vacuum Tube …
Roy Mottram Archives - Audiophile Nirvana
https://www.audiophilenirvana.com/tag/roy-mottram/
Tag Archives: Roy Mottram. Dynaco ST-70: A Timeless Classic. Posted on June 28, 2016 by Jim Lansing June 28, 2016. David Hafler and Ed Laurent founded the Dyna Company (later Dynaco) with the intention of not only producing transformers, but high-quality audio circuitry. The company was incorporated in October 1955, with business premises ...
ST70 Comparison Test - tubes4hifi
http://tubes4hifi.com/st70mods.htm
by Roy Mottram PLEASE NOTE: this article appeared in Volume 2 Issue #1 1990 Glass Audio magazine, alot of the information on the various modifications has changed in the past 30 years!! for a year 2002 update of this article featuring current sources of modified driver boards for the ST70, go to mods02
tubes4hifi home page
Tubes 4 HiFi is also known as Vacuum Tube Audio Our best known product is the VTA ST70 PCB modification for the Dynaco ST-70 amplifier, that first appeared in a Glass Audio magazine article in 1989. You can purchase any of our products here from these web pages, making payment with a credit card through PayPal, or sending us a money order.
Vacuum Tube Audio ST-120 Tube Power Amplifier …
https://hometheaterhifi.com/reviews/amplifier/power-amplifier/vacuum-tube-audio-st-120-tube-power-amplifier-review/
The Vacuum Tube Audio (VTA) company is the brainchild of Mr. Bob Latino (power amplifiers) and Mr. Roy Mottram (preamplifiers). Doing business at the Tubes4HiFi.com website, all products are available Internet-direct.
Listening Room: Component Overview. VTA Preamplifiers ...
https://www.youtube.com/watch?v=zfzonMEuEFo
Overview of the Vacuum Tube Audio (VTA) tube preamplifier and tube phono preamplifier.See Roy Mottram's (VTA) preamplifiers here... http://www.tubes4hifi.com...
preamp reviews - dsachsconsulting.com
http://www.dsachsconsulting.com/preamp%20reviews.html
Don has now taken the great tube SP14 tube preamp design from Roy Mottram at "tubesf4hifi" and is selling these preamps with several upgrades and optionality for buyers. In contrast to Roy's original design, Don puts the basic SP14 circuitry in a custom-made wood cabinet with the tubes side exposed on top for better cooling and access for those ...
buyer beware | diyAudio
https://www.diyaudio.com/community/threads/buyer-beware.238297/
I got in touch with Roy Mottram who couldn't decide if the voltages at the grids should be 129 as per his schematic, 55 volts as per 4 customers ( including myself) or 12 to 14 and 0 volts as per his email. He then stopped the voltage discussion altogether. After many hours of searching I found a problem on the pcb and advised Roy.
ST70 Comparison Test - tubes4hifi
http://tubes4hifi.com/mods02.htm
by Roy Mottram NOTE: most all of these mods are no longer available except our VTA design due to it's superior design and performance. The Dynaco driver board is the weakest part of the ST70 design, and after 20 or 30 years it is due to be tossed out and replaced.
Vacuum Tube Audio SP14 preamp by Don Sachs
http://www.tubes4hifi.com/don.htm
Vacuum Tube Audio - tubes4hifi. complete assembled/tested/warranted preamp, built into custom chassis allow 3-4 weeks build time, these are custom built to order, and there may be a …
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