| Re: Need favorite 12B4 for Guinevere line stage recommendations? [message #31505 is a reply to message #31500] |
Wed, 30 November 2005 05:50   |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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As Doug said, 6 times (15,5 dB) amplification would be more then enough with most of the input sources. Input of 750/6=125mV = full output needed (750mV).
On the original schematic, you can change the tube to 12B4A and put 6 LEDs for bias in series (original=two LEDs), for the new OP, about 100V/20mA/-11V. Or you can try the resistor of 11/0,02 ~ 560 Ohms.
For CCS current adjustments, see the link. You can find various ideas about "Guinevere", PCBs, etc. in the archive.
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