The 6R7 and 6T7 are rather different although they have the same
base and grid connections. One will do for trouble shooting the other
but the triode characteristics are rather different. Also, the envelopes
are of different sizes, a 6T7 may not fit in place of a 6R7. However, if
one is easily available give it a try. The noise could be caused by the
tube.
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On 11/1/2024 9:43 AM, dtssr via groups.io wrote:
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Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
