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In Reply to: RE: Using Dynaco A420 opt with ST70 kit posted by KevinC on November 26, 2012 at 04:10:53
Hi Kev, thanx for replying. What i am trying to find out is will my Dynaco A420 OPT be ok for use with your Dynaco ST70 transformer coupled mods. In other words, should i use the A420 with fixed or cathode bias? If its better with cathode bias, will your ST70 upgrade mod work with a cathode biased EL34 power stage? thanx again
Follow Ups:
Yes, your A-420s will work fine in the upgrade circuit. You certainly can use EL34s, but aren't limited to them. 6550, KT-88, 6L6GC, KT-120 will all work.
Kevin Carter
K&K Audio
www.kandkaudio.com
Hi Kev, does your st70 upgrade kit support cathode bias on the power tubes? Or is there a need besides the bias resistors for other changes? thanx again, happy holidays, Dak
In fact, the only way the K&K ST-70 upgrade works is with cathode bias, but not with a resistor like most, rather with a constant current sink.
Kevin Carter
K&K Audio
www.kandkaudio.com
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