[Collins] 75S-3 Tubes

Tue, 5 Feb 2002 12:21:37 -0800

The 6U8 was a LMR & serviceperson's nightmare. We switched to the EA8's and
service calls almost hit zero.  Someone suggested a 6DS6? as the audio amp
in the 75Sx ... seems it worked. Does anyone have / remember that
substitution? Ron, W2WU
----- Original Message -----
From: Tony Sokol <[email protected]>
To: Mike, K8LH <[email protected]>
Cc: <[email protected]>
Sent: 05 February, 2002 07:50
Subject: Re: [Collins] 75S-3 Tubes


><snip>  6U8's are notorious for causing a multitude of problems due to grid
to cathode
> shorts that sometimes does not show up on a tester.  Swapping is the only
answer.
<snip> famous for AC hum ... people scratch heads all of the filter caps
have checked good.
< <snip>
>
> Tony - W9JXN
> <snip>
> >
> > Question -- my 75S-3 has 6U8A tubes but they're not on the 75S-3
> > schematic...  Are the 6U8A tubes in my 75S-3 compatible with the 6EA8
> > tubes on the schematic???
> ><snip>