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I picked up a Palomar 300a not working it is a amp with transformer in separate box. I replaced Keying transistors and amp was working but on just key up in power operate mode transformer has a hum. I replaced all capacitors and power rectifier diodes but on key up in power operate mode still...

BBB I will check but I believe he said one channel transmits. I am reading the site you posted and it is very interesting. I think he was hoping to hook up a VFO on transmit and do away with PLL he has taken to some tech around here and he did some work but did not fix. Jerrys CB in Toledo...

I have a local here who has a Mark IV and transmitter not working right he was told he could use a VFO to transmit on and asked me what model or number would work and I do not know. Does anyone know what VFO he could use to hook up and transmit on his radio. Thanks Jimbo

I would not worry about sticking with one type for easier repair because if bought right the radios will be a if they do not work you throw it away because of the cost of repairing them. Any 40 channel mobile will do just fine with a power supply because of cost but base wise any 40 channel...

Found problem one of the 100mfd 150v capacitors was bad replaced both and now amp has almost no hum when keyed. I had did a quick check when they were in line but the one did not show bad until I removed and checked it out of amp. Thanks for the help. Jimbo

I am working on this amp for a friend when I received amp had a bad vibrating type hum from transformer when just turned on I replaced power rectifier diodes and amp has no hum and is very quiet when power on. Amp is working fine power output wise also but when keyed has a small hum coming...

Thank You for the info. Jimbo

I picked up a SB220 and during cleanup of amplifier the resistors on top of capacitors look like they got hot so I want to replace them . They are a 30k 7 watt resistor not sure of voltage required , there are 8 to be replaced. I googled them and nothing came up and have not been able to find...

Alan said that The OB2 is a 100 V regulator for the oscillator. It keeps the oscillator stable so it doesn't drift during power line fluctuations. So I ordered one and will install it when it get here. Thanks Alan

Put the relay in and radio keying like it should. Wavrider I did also found a problem with microphone it was a powered D-104 and causing radio to have a squeal during keyup .Thank you wavrider and others for your help. Jimbo 165

Picked up another Golden Eagle 2nd one in a month but unlike last one this one seems to be working ok. The only thing is the OB2 tube is missing in the Sams Photofact book this is a voltage regulator tube but radio seems to be working without it my other Eagle has this tube does the radio...

Thanks Atlasta I checked voltages and seen that wondered if that was to high the Sams book on it shows no voltages and that looks like what is going to side of relay coil is that to much?. Wavrider I just jumpered two wires from old relay still hooked up to new one and it works on keying mic so...

I checked relay coil put multimeter on ohm setting touched coil in and out and meter showed nothing so I think it is shorted out. Thanks wavrider you have always been a great help here on this forum.

I checked mic wiring all looks ok have a Sams book. I have ordered a relay for it will be here this weekend hopefuly that will the cure.

I hate to do it also space cowboy but we have no techs close and the others will charge more than radios worth. I have quite a collection of old radios on shelf waiting to get fixed. I am still learning and sometimes pull one off and fix it after getting help here or other forums. Thanks Jimbo

Thanks Radioman for the info I believe I will put it on the shelf until I learn more trying everyday. I may part it out also everything looks good and works except for above problem. I thought maybe someone could steer me to final or cap that could be causing it because they may have had same...

I just got a Golden Eagle and I have no key up on transmitter, checked tubes, Microphone and do not see anything burnt or fried. It has a 110VDC relay but I do not know how to test it have no 110vdc supply. Any ideas on what to look for?? Thanks Jimbo

I have a GE Super base model 3-5875a when I key up no power output for about ten seconds then it will have power out put for 20-30 seconds and then go back to no output. When I put it into sideband mode I get no output at all. This is a very nice looking radio no real techs in my area. Any...

Thanks for all the great comments. Jimbo165