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23rd August 2011, 07:09 PM
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#81 |
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diyAudio Member
Join Date: Mar 2009
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I experimented with SRPP stage with GU48 & 250TH in lower part and GMI11 & GU81on the top. Cascade supply 4200V-50mA. SRPP with two GU48 didn’t give me enough gain. Best that I’ve got was with 250TH & GMI11. GMI11 isn’t the best choice of course also, Idea required some indirect heated pentode, but I just had these. There are oscillograms with 180 & 1680pF of load on 20kHz. Not too bad for first experiment.
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24th August 2011, 05:21 PM
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#82 |
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diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
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Very Cool !!!!
jer 
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