[MRCA] PN-8, PN-9, PN-12

[WA5CAB at cs.com]

Roger,

It took some digging before I got the lead.  And did some digging in SIG 5.  
Then all was clear.  These are the oscillator and RF amplifier panels and one 
of the two HV power supplies from the BC-640 VHF AM transmitter.  You probably 
don't need them but if not too inconvenient, at this late date I would say 
that they are worth saving.  This isn't a popular set (and suffered from bad 
press in the Surplus Pervision Manuals).  But they remained in USAF service into 
the early 60's.  And were the mainstay transmitters of fighter control 
circuits in Europe during WW-II.  The pair that I once owned were retired from 
Barksdale AFB in 1965.  They were replaced by the AN/GRT-21.

>From a practical standpoint (usefulness of surplus), the amplifier and 
oscillator panels aren't particularly useful except as spares for the BC-640.  But 
the PN-12 outputs a nominal 500 and 1000 VDC at around 250 MA from 220 VAC.  If 
you replace the four 5Z3's with 1N4006's and operate it from 120 VAC, you can 
get around 270 and 550 VDC, useful for working on a lot of sets.

In a message dated 6/7/2008 1:51:27 PM Central Daylight Time, 
mr3hi8st8or5y at cox.net writes: 
> Hi guys,
> I have the opportunity to pick up a PN-8 Amp, PN-9 Oscillator, and a PN-12 
> Power Supply Panel. Do I want these? What were they supposed to go with.
> Roger k0rmk

Robert & Susan Downs - Houston
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