07-08-2012, 07:34 PM
Hi, Codefox --
So, I tuned up the generator (RCA WR-50B) and installed the bridge -- had to add a series resistor to keep the B+ within spec. (I do have a digital counter, by the way, and the RCA is remarkably stable after a short warm up.)
Still no response on the output meter. So I used the 400 Hz modulation signal and peaked by ear. Found the existing settings were really not very far off at all. Someone who's had years of experience with this process and knows what to listen for (or how to get a readable meter response) could probably do this better. But the radio works really well, so I'm going to be satisfied for now. I'm leaving the RF compensators alone until I feel sure about the IFs.
But in the future I really want to know what is the correct / best way to do this. I will try connecting to the voice coil -- that may be what it takes, despite the Philco Service Bulletins. I just had a Philco model 16 in the shop, wanted to tune it in, had the same issue exactly.
Thanks for your suggestions!
David
So, I tuned up the generator (RCA WR-50B) and installed the bridge -- had to add a series resistor to keep the B+ within spec. (I do have a digital counter, by the way, and the RCA is remarkably stable after a short warm up.)
Still no response on the output meter. So I used the 400 Hz modulation signal and peaked by ear. Found the existing settings were really not very far off at all. Someone who's had years of experience with this process and knows what to listen for (or how to get a readable meter response) could probably do this better. But the radio works really well, so I'm going to be satisfied for now. I'm leaving the RF compensators alone until I feel sure about the IFs.
But in the future I really want to know what is the correct / best way to do this. I will try connecting to the voice coil -- that may be what it takes, despite the Philco Service Bulletins. I just had a Philco model 16 in the shop, wanted to tune it in, had the same issue exactly.
Thanks for your suggestions!
David
