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camotecue wrote:nice xformers tony! maybe you can post some frequency measurements when they're done.
carbondated wrote:Good luck! This looks like an interesting project
tony wrote:a couple of those tubes....
edrel sison wrote:tony wrote:a couple of those tubes....
i wonder how high the B+ would be. what are those tubes tony?
tony wrote:finally.....
input tube is a 12BY7, ltp drivers are paralleled 12BH7's, this is a non-global negative feedback amplifier, the KT88's are run as triodes so that the resulting low plate resistance from parallel operation negates the need for global negative feedback.....
biasing at -47v power consumption was:
backing down a bit to -50volts yeilded this power consumption and seemed to be stable, no drifting was noticed and the tubes were surprisingly within 2mA of each other....
setup psu and amplifier block combo for a listening test:
tony wrote:Update:
this is a 6P3C push-pull power amp for a friend....6P3C is the Russian equivalent of the 6L6GC tube.....OPT's used Edrel's Z11 cores....
It was built to help multi-amplification system by running the JBL 2235s for as low as 20hz, stricly subwoofer use only. The test was superb from a JBL 2245s. The tubes were warm but never over-heated. This outperforms my friend's Audio Research mass candle lights according to him; I applauld to the mastermind builder Tony!!! thank you so much.
lovejbl
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