[R-390] R-390A blown fuse, now distorted line and local audio

[Larry H]

Hi Tom,  I believe that Jacques is totally right about a short in a
filament line (including the 25.2 vac) that caused your fuse to blow.
Another possibility is that one of the 26Z5's went and now you may have low
B+ voltage.  That can cause distorted audio, also.

Regards, Larry

On Tue, Apr 9, 2024 at 5:46 PM Jacques Fortin <jacques.f at videotron.ca>
wrote:

> Hi Tom,
>
> My guess is that V601B filament gave up.
> So you have the 1st audio stage working, most probably, but the cathode
> follower stage that follows is inactive.
> Quick fix: change V601 and check if the audio returns to normal.
>
> If not, more investigation in the AF chassis is due.
> That could be also the V602 that developed a gas leak....
> Let us know what you found, anyways.
>
> 73, Jacques, VE2JFE in Montreal
>