[Milsurplus] BC-639 modification

[B. Smith]

The BC-624-AM and BC-624-C (SCR-522) used a 6H6 (actually a 12H6) in a noise 
limiter and A.V.C. delay circuit, this wiring was not present in earlier 
receivers . The modification was under the receiver and the tube was mounted 
on a bracket at a 90 degree angle to the chassis.    The SCR-522 receiver is 
very similar to the BC-639.
----- Original Message ----- 
From: "Robert Flory" <robandpj at earthlink.net>
To: "milsurplus" <milsurplus at mailman.qth.net>
Sent: Wednesday, September 09, 2009 5:25 AM
Subject: [Milsurplus] BC-639 modification


| Hello,
|
| Does anyone know of a modification to BC-639 that adds a 6H6 tube?  My 
example, in Air Ministry paint job, has one.  It shares MFP treatment with 
the rest of the radio so I think a factory job.
|
| Rob
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