The original EL34's will bias just fine. I called the company that I bought the KT77's from and they said that the range of the bias pots was not enough to accommodate these KT77's so I may have to send them back. I'll call Jolida and see if there is a way to modify the amp to accept the KT77's.
how to adjust bias for kt77 tubes in Jolida 302
I just got a set if KT77 tubes to try in my Jolida 302brc amp. The "easy bias" lights do not come on when I adjust the bias pots. The manual says to use multimeter and adjust bias to 400 - 450 millivolts but the pots only go up to about 180 millivolts. I am a little confused here. Some on-line resources say bias at 40 - 45 mv, that's 1/10 what the manual says.
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- 4 posts total
- 4 posts total