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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: How do I modify my ST70 to individually bias the EL34's? posted by MitchN on December 9, 2000 at 16:23:29:
You might be able to add 2 more 10K pots, but you would need to separate the junctions of the of 270K resistors where they tie together on the board (eyelets 6 and 21) and connect each pot wiper to the individual resistors. You would also need to use separate cathode resistors on each tube and it will be difficult to find more 15.6s...just use 10s and bias to 1 volt. I would fire the amp up without output tubes to see if the bias voltage is within range first. You might have to play with the pot values to get it right. This would be a juggling act to get each tube at the correct point because every time you adjust one pot, it would change the readings on the 3 others.
Uncle Ned, please correct me if I have made a mistake here...Good luck, Tom
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Follow Ups
- Re: How do I modify my ST70 to individually bias the EL34's? - hifitom 02:35:16 12/11/00 (2)
- Re: How do I modify my ST70 to individually bias the EL34's? - Joe Rosen 16:45:22 12/12/00 (1)
- Thanks very much! - MitchN 11:53:17 12/13/00 (0)
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