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RE: Recommended bias for KT120's...

Posted by 6bq5 (A) on August 5, 2023 at 16:56:41

In Reply to: Recommended bias for KT120's... posted by tube Tom on August 4, 2023 at 15:22:10:

Tom,
I will state up front that I am not a fan of the New KT series that started with the KT-90 and have increased in series to KT-150 I think...

Having said this - the spec sheets for these tubes are readily available - and I have linked the Tung-Sol KT-120 below.

I would reach out to quicksilver to make sure that these amps can support these tubes - the KT-120 before I adjusted the plate current to the design spec - assuming that the amp could support that.

There is also a significant difference in the plate voltage between the two tubes, and the EL-34 for that matter - the 6550 and EL-34 want ~250 Volts where as the KT-120 wants 400....

unless you have one of the newest amps from Quicksilver, I might discourage you from trying to run the KT-120s at their rated conditions in the amp you have.

YRMV
Happy Listening

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