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ive had to replace the plate choke in two al811s over the years. both times the wire had just broken. LC

my thought would be that there is some ripple current that is causing the cap to heat up, but you said you tried it on an external DC supply right? if so, that would take my idea out of consideration for the most part. you could just say F it and replace the circuit with a 7808, but of course...

Ah how I love a good conspiracy theory post! I love to read about conspiracy theories, and i liken it to taking psychology in college. There is a well known phenomenon that happens to a great number of psychology students once they get to a certain point in their learning. At this point they...

dss56, you should also replace those three electrolytic caps. if they are on their way out (they have a lifespan) then they can take out other parts that are hard to find. replace the caps and that counter will last a long time. LC

Well AE575 at least we'll all know it's you if we contact you in DX land! JK! seriously though i do hope you recover quickly. bells palsy can last for months in some people. LC

How about calling it the 457 and doing away with the FM and PA functions? then the mode switch could be AM USB and LSB. turn the PA jack into an amp keying jack. would sell like hot cakes. LC

yeah neither did i. i did have the note about the 470uf cap, so that must've come from you. and thanks for all the diagrams! LC

Thanks for that 711! I might have that thread saved somewhere but i'll never find it. I was a bit surprised by Nomad's response to Ronnie's post because i remember him being in the original thread. Did anyone ever try this with a radio that also had an RFX unit on the back? that could be...

well ive got to try it next time i get a 29 or other AM transformer modulated radio through here. LC

Ronnie i've never actually built it. I just happened to be part of the discussion back when That one guy brought it to the group without part values. looks like i may have gotten the pot value wrong, as you say the one you built did indeed work well. did you find you had to add that 470uF cap...

This reminds me of something!

http://www.k0bg.com/static.html the first paragraph does a pretty good job of explaining the advantages to DC grounding a mobile antenna. LC

Pez, any chance we can get a list of these shops? I know a few people that are wanting warranty work done. thanks! LC

what i showed there was the most basic form of the NPC mod. This mod only has one purpose, and that's to allow a radio to swing to its max PEP (you won't gain any more PEP watts by doing this mod) from a low deadkey while keeping the scope pattern clean. unless you turned the deadkey down...

I have done this, and it is effective. i will say though that i have encountered knobs that required enough squeezing force that it deformed the knob slightly, even if it didn't make an impression. LC

I figured this was useful enough to share in hopes that it helps save the faceplate of at least one classic radio out there. As im sure many of you have experienced, removing the knobs from an old radio can really test one's finger strength, and patience. how many of us have reached for a...

well there ya go Willie! i'll only add to what Nomad posted that i have had luck reducing the noise further by placing a 470uf cap right across the power leads on the counter board. also, be careful as the wire colors will be wrong on one side. you'll see what i mean when you get the counter. LC

yep you sure can. I have used MANY of these for that exact thing. these are the counters i use when i put one in a madison. they have a great feature where you can program in your IF freq so they can be used with different radio designs. However! they are noisy as all get out and will put a...

Im pretty sure Nomad has retired more scopes than most of us will ever buy. Nomad, I noticed you volted the final as part of this mod. Was this just because that's what the customer wanted? I didn't think you were much of a fan of volting the final because it's no longer being modulated. LC

let's see here; square root of squirrel's head equals...