BWS Consulting: Exclusive Vacuum Tube Audio Design-Audio Engineering Services & Home Theater Services

Call 703-536-3910

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Dynaco Amplifier Upgrades

I have been performing upgrades and total redesigns of the St-70 and Mk III, Dyna Company amplifiers, since 1980s when I introduced my first custom products. 

These amplifiers make an excellent base for many redesigns.  This St-70 has been totally redesigned and features the Bendix/Mu 3D21 as the power output tube.  I also provide redesigns using the 7236 and 6080B dual triodes, and the original EL-34.

Please fill out a request form or call me at 703-536-3910.  The Model Amplifier Shown, iIs Available For $3800.00 New Build - With A Cage.