09-24-2008, 04:10 PM
Dave,
Re: 29A and 29B, I can only refer to the John Rider alignment instructions that are on Nostalgia Air. Those instructions say to adjust 29A and then 29B in that order. I assume you have downloaded these free pages from Nostalgia air: http://www.nostalgiaair.org/PagesByModel...013533.pdf
It is very hard to read, but it looks like 29A is an adjustable inductor in the transformer # 29, and 29B is an adjustable capacitor on the secondary side. As Chuck mentioned, the Philco factory alignment instructions might differ. I don't have access to those instructions for this radio.
Assuming compensators 34A, 31A, 29A, and 29B are adjusted properly in that order, with a signal generator, then you should get the best sensitivity with any given antenna. If your sensitivity is still not good, try the loop antenna in the cabinet, and then I'd suspect a tube or other component in the chassis.
Did you replace the 41 tubes that you already think are bad? The AES tube sale goes through Sept. 30. I might buy a couple of 41s myself.
Re: 29A and 29B, I can only refer to the John Rider alignment instructions that are on Nostalgia Air. Those instructions say to adjust 29A and then 29B in that order. I assume you have downloaded these free pages from Nostalgia air: http://www.nostalgiaair.org/PagesByModel...013533.pdf
It is very hard to read, but it looks like 29A is an adjustable inductor in the transformer # 29, and 29B is an adjustable capacitor on the secondary side. As Chuck mentioned, the Philco factory alignment instructions might differ. I don't have access to those instructions for this radio.
Assuming compensators 34A, 31A, 29A, and 29B are adjusted properly in that order, with a signal generator, then you should get the best sensitivity with any given antenna. If your sensitivity is still not good, try the loop antenna in the cabinet, and then I'd suspect a tube or other component in the chassis.
Did you replace the 41 tubes that you already think are bad? The AES tube sale goes through Sept. 30. I might buy a couple of 41s myself.
John Honeycutt
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