[R-390] R-390A 6C4 Mixers

[Les Locklear]

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 <bjtatum1 at att.net>
To: <r-390 at mailman.qth.net>
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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