[Hallicrafters] Hallic. SX-24

[Mark Shaum]

Had a similar problem with my SX-25, replacing the screen grid bypass
caps cured it in my case.  Several of the smaller value mica caps were
leaky or off tolerance, which is unusual for those types.

----- Original Message -----
From: "k7mks" <k7mks at attbi.com>


> Am restoring a SX-24 and find that Vg to the 2 IF tubes (6sk7s) run -9
> to -20VDC instead of the usual slightly negative.  Vp & Vsg are OK.
> Removing the 6H6 DET/AVC has no effect on this high negative voltage
which
> also appears on the RF amp. grid.  All caps have been changed. Tuning
> through an AM station it sounds like the BFO is ON  when it is not.
> Reducing RFG clears problem somewhat.  Am wondering if RF stage could
be
> oscillating with RFG full CW.  Have substituted tubes to no avail.
The
> source of the high negative voltage on AVC line has me puzzled.  Any
ideas.
> Please respond directly.  Thanks, Joe K7MKS
>