[MRCA] Vibrators

[WA5CAB at cs.com]

Wasn't that AVT-15A and AVR-20A?  If so, it is wired for 6 volts.  As with 
Dennis, the only octal based vibrators I've ever come across are VB-11, 12 and 
13 used in the PE-120-(*).  I didn't bother to check the base wiring of the 
VB-12 (the 6-volt one) as even if it would work, they've become almost unobtanium 
because when the US and French armies abandoned 6-volt vehicles, the PE-120's 
got put into 24 volt ones and the 6-volt vibrators were discarded.  

The vibrator used in the AVT-15A was of the shunt (rather than series) type.  
I would rather recommend that you make a solid state replacement.  Finding an 
octal plug is a lot easier that finding a 4, 6 or 7-pin one as used on most 
vibrators.  There was a circuit shown in ER some years back for one to replace 
the vibrator in a DY-88 or DY-105.  I have a .TIF copy of the article but it 
doesn't show what issue it was in.  Maybe Richard will see this and post it.  
The name of the article was "GRC-9 Operating Notes", by Richard Brunner.



In a message dated 12/14/2006 
> >I have a circa 1941 RCA RVT-15A  Aircraft transmitter.  It is missing
> >the vibrator, the one it uses has a octal base...........

Robert Downs - Houston
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