[Milsurplus] fix for GRR-5 rectifier problems?

[WA5CAB at cs.com]

Mike,

The rectifiers that the guy at gilbert was talking about would probably be 
the single plate seleniums (CR-102) mounted in the bottom of the case.  The fix 
is to disconnect the leads to these rectifiers at the lower wiring harness 
connector and install silicon replacements from those same terminals (pins 2 & 4) 
to ground (pin 10) inside of the PP-308.  The most conveniently mounted 
replacement will be a bridge, using only the back half (leave the "+" lead or 
terminal floating).  There is also a bridge rectifier inside the PP-308 (CR-102) 
which can be replaced with another of the same type bridge rectifier.

After the mod, turn the filament adjust resistor fully CCW before starting to 
test.

The other thing you may encounter will be either or both vibrators failing to 
run.  This can usually be fixed with the 25 watt lamp and AC line method.

In a message dated 10/9/2006 10:15:33 AM Central Daylight Time, 
mike_davidsen at yahoo.com writes: 
> A friend of mine owns a GRR-5 receiver.  It's a
> beater, but it works on battery power.  All the
> rectifiers are blown, so battery power only.  I met a
> guy at the Gilbert, PA MCRA meet, who told me that
> this radio has a simple, under $10 fix that some
> hammers have done to install diodes to bypass the
> original rectifiers.  My friend would really like to
> hear any info about this fix, so he can get his rig
> back in operation on regular power options, without
> having to solder together a battery pack all the time.
> 

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)