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Check this out, I've seen this before on another old am radio, but an alignment of the band pass area straightened it out. Is anyone familiar with this, what could be causing it? It was worse, shaped like 2 halves of two different measurements put together. This was a scrap/parts radio that I...

I've added talk back to a Grant classic (almost identical inside to the Grant DX), using the modulation meter switch to bypass the diode in front of the audio chip. I use a small amount of reverb sometimes and thought it would be cool to monitor at the radio. In SSB it sounds terrible (with or...

I like my older radios, most were discarded by someone else and snatched up for parts and experimentation. Mine always end up as living breathing functioning works of love. Even after freshening up, some of my radios drift with temperature. Being in the Cleveland area, my mobiles can see...

I think I know where the problem might be, but thought it would be cool to share as I undo a few audio cap changes that I thought would "open up" the audio a little more. The issue is with the ALC and AMC adding weird distortion and oscillation that will continue without any added audio while...

Hi everyone, I smoked L39, the .47uH inductor near the finals in one of my PC409 Grants. I'm sure someone else may have been, or will be in this situation. Without any HG 2SC1969, or similar for replacements onhand, I installed the IRF520 and related components. I have a few others that...

I like these old PC66s and grab them up when they are cheap or "for parts". This one has a channel mod that was installed improperly. It wouldn't transmit or receive when I first tried it out. The ground and input were reversed on the "switch/xtal" board to the add-on "tune board". After...

I know these are considered "throwaway radios", but I just can't leave anything alone! I feel like I've searched everywhere that I could and can't find any information on this thing. A schematic would be great. (I'll add the board number tonight, when I get home from work, It might "jive" with...

I'll try to keep it short. Uniden PC122 I tried a diode in series with R186 to lower the AM deadkey to use with a small amp. On the meter It worked great, with 1W deadkey, 9W Avg/18W PEP. On the scope I can remove all negitive carrier pinch but, even with the limiter all the way up I still...

Hello everyone, this is my 1st thread, it's going to be more question with a small introduction. All of my radios were either given to me, or purchased for a few dollars. They were mostly basket cases that were replaced by something more modern and some from retired Truckers. Every time I...