[R-390] Weak BFO Cured

[David Wise]

I did not try other tube types.
It's not gain in the sense we're used to thinking about, it's output impedance when operating as a cathode follower.  A tube with lower impedance is likely to work, for the same reason as my mod.
This doesn't come out clearly in the spec sheets.
Unfortunately, 6BZ6, 6CB6, 6DC6, and 6DE6 are disqualified because pins 2 and 7 are reversed.  (6JK6 and 6EW6 are also disqualified by heater current.)

Dave Wise
________________________________________
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of Perry Sandeen via R-390 <r-390 at mailman.qth.net>
Sent: Sunday, May 05, 2019 3:42 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Weak BFO Cured

Yo Bubba Dudes!.
Dave Wise wrote:   Some years ago my BFO gradually weakened and died. Replacing the tubedid not help.
OK, question.  Did you try one with higher gain i.e. 6BZ6, 6JK6 etc?

If not, do you think that it would have solved the problem?
Regards,
Perrier