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I do not think they do, much. I think you will get a general degradation due to aging capacitors and resistors (especially electrolytic caps and carbon resistors). My experience with semiconductors is they tend to go away pretty much all at once, whereas tubes lose it a little at a time, faster...

Thanks Hey Loose Cannon, I owe you a Beer ! I just got 3 of these on FleaBay and the first 2 I tried no transmit ! Flung open the cover of the prettiest one and changed c95 and it transmits ! I might have found this eventually myself because I am replacing all the Electrolytic caps in all 6 of...

On behalf of everyone who uses those frequencies, TV RADIO, thank you. Those are trap coils. Excellent explanation.

Follow up: Hi Dr_DX, $80.95 got me the 3 tech vol tec. special, + $40 odd through eBay got his : UNDERSTANDING & REPAIRING CB RADIOS, I already have his PLL book, soon I will be "Book Smart" and "Butt Stupid !" Ha Ha, I just got a message from a seller who sold me one of these export radios...

I have a Function generator (wavetec) a scope (Tektronix's) and 2 frequency counters (HP) God bless eBay ! The thing is, my function generator does not seem capable of modulating the signal. I have ordered parts, I am going to replace all the Electrolytic caps before going any farther, seems...

Follow up: Thanks Bionic Chicken for the info. you sent me. I have President Grant's Bootprints all up by backside ! I found a cold solder joint, fixed it and viola it transmits, but has NO ears. Lots of hiss on FM, mouse quiet on AM/SSB, if I touch the detector I get the local AM news...

Towel is a good idea, teens always forget to bring one to wipe off the prints :D

He posted the PCB files if you want to order them from the supplier, I just started looking at this today, to see what he did, got it in mind to roll my own using a PIC, might have to Faraday cage it for noise though.

Hello Bionic Chicken, I have an SWR meter, no watt meter, waiting on a coax jumper to hook it up. Red xmit light comes on when keyed, but no RF to speak of, unless I touch the SO42P mixer circuit, then Power comes up, my computer screams from it's speakers and the field strength meter pegs...

Hi everyone, I'm a new member, thank you for this forum. About 8 years ago a coworker gave me this President Grant Export radio. I have not played with radios in some 30 years, so I did not have an antenna, and like a MORON loaded it with a light bulb, and made it not work. Stupid !, so I put...

All good responses listed above. Last note, sometimes a transistor gets noisy as it says goodbye, also check to make sure the ceramic filter has not been, oh pick your adjective, fixed, molested, modified, removed . . .bypassed, enhanced.:bdh: Oh and thanks MisterFatty for the Sam's EDIT: I see...