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Problems with LL1660 driving 6c33! Need help!

217.236.60.111

Posted by Haukito on October 27, 2003 at 03:02:43

Hello Kevin,

i have problems with my LL1660/20ma interstage transformers to drive directly the 6c33 triode.
I get a freq. cutoff 1-2 db continously from 10Khz. The -3dB point is 23Khz. I use a 6c45 with 40mA in ALT S 1:1,25 connection (gain ~50). I also tried the 5842 with 20 mA in that connection. On the scop you see a cutoff 1-2 dB continously from 10Khz. Probably it happen because the input capacitance of the 6c33 is ~11pF. But what could i do? I also need a gain in this circuit near 50 or more!

Thanx a lot

Hauke

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