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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: GE 6CA7 - Can't bias tube low enough posted by Capt. Z on April 12, 2007 at 04:56:47:
Hi:
Are these the large bottle 6CA7's, about the size of a 6L6GC or larger?If so, and the amp was designed for the skinny bottle 6CA7/EL34 type, that might explain it.
The large bottle type needs more negative bias then the EL34. In some amps, you can change a resistor in the bias circuit to change the operating range of the bias adjustment.
Hope this helps! Al
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Follow Ups
- Re: GE 6CA7 - Can't bias tube low enough - Alpha Al 15:30:00 04/12/07 (3)
- Re: GE 6CA7 - Can't bias tube low enough - Jim McShane 06:25:19 04/13/07 (1)
- Re: GE 6CA7 - Can't bias tube low enough - Alpha Al 20:33:38 04/14/07 (0)
- Re: GE 6CA7 - Can't bias tube low enough - Capt. Z 15:36:16 04/12/07 (0)
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