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Tube Bias VDC EL-34 vs. KT-77 and KT-88

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Waynefi

Tube Bias VDC EL-34 vs. KT-77 and KT-88
« on: 10 Jan 2018, 03:22 am »
Assuming my DC voltage setting for bias is .30 to .35 for EL-34, what should the setting be for the KT-77 and
 KT-88 ? My thoughts(uneducated), is the KT-77 should be similar to the EL-34, but the KT-88 a bit higher ?
Thanks,
Wayne
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FullRangeMan

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Re: Tube Bias VDC EL-34 vs. KT-77 and KT-88
« Reply #1 on: 10 Jan 2018, 03:28 am »
Quote from: Waynefi on 10 Jan 2018, 03:22 am
Assuming my DC voltage setting for bias is .30 to .35 for EL-34, what should the setting be for the KT-77 and
 KT-88 ? My thoughts(uneducated), is the KT-77 should be similar to the EL-34, but the KT-88 a bit higher ?
Thanks,
Wayne
Your amp allow KT88?
These values you mention looks to be mA DC current not Voltage.
It would vary based on the +B and grid/plate V on your amp, usually KT88 Bias its a bit more than EL34 to offer more output W, sometimes also depend on brand, NOS, new or used tubes.

For comparison purposes take a look at this amp Bias values:
**EBAY AMP++
« Last Edit: 10 Jan 2018, 04:45 am by FullRangeMan »
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