Further on flaky tubes, the 6BE6 has been one of the most replaced tubes in my
long memory. Try the computer rated 7036 which is a tall version of the much
maligned 6BE6. Again they'll last almost forever.
Les Locklear
----- Original Message -----
From: Byron Tatum <[email protected]>
To: <[email protected]>
Sent: 6/29/2024 6:44:17 PM
Subject: [R-390] R-390A 6C4 Mixers
________________________________________________________________________________
Hello- If any members have the time I wanted to ask some questions regarding
the 6C4 tubes used as mixers in the R-390A. I have been going through my 6C4
type tube stock here, testing them on a TV-7D/U, preparing for some work on a
few receivers. Is there any advantage in using the variants of the 6C4, such
as the 6C4WA, 6100 or 6135 instead of using the plain 6C4? Can someone explain
the differences between these variants and the common 6C4. As I understand it
the -WA, 6100 and 6135 variants mostly differ in ruggedness and possibly
quality of construction. Just curious about other's opinions here. I have researched these variants and studied the data sheets. Was wanting to know if any electrical properties of variants would benefit mixer service. I know that sometimes the particular brand/variant of 6C4 can be critical in oscillator service. I experienced this some in restoring a few HQ-180 receivers and picking out the most stable 6C4 oscillator tubes. Thanks for comments,Byron W5FH
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