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Thanks for the replies, kc8adu. I wish we were in the same city - that'd be handy. I'd definitely buy you a case of beer and or some lunch! Would be cool to learn a thing or two from someone about this stuff too. The radio looked 100% stock when I got it. I don't think anyone has done...

I just spoke with the owner and he said he's got a Hickok tester and I can drop my tubes off with him in the morning and he'll test them thoroughly for 25 bucks and let me pick them up. I think that's worth it, I've got about 25 tubes for this radio. 1$ a tube. Much cheaper than finding a...

I have the terminals of the original two cans completely disconnected electrically. Falcon, The hum doesn't necessarily go away when I turn up the volume, it just is easily drowned out. If you only turn the volume up so far (hearing static & other transmissions) you can still hear it...

Could V13 also be the culprit?

Thanks for the reply. Pretty sure I've swapped V12 with another that I have on hand. Not certain the other tube is good. What are some other tubes that are used in tx/rx like V12? I'm going to the radio shop this weekend to have all of my tubes tested again. I know last time I was there...

This is frustrating. I've taken my replacement (brand new, from the package) caps out and recapped 3 times now and double checked my work each time. This radio only has 10 electrolytic capacitors. (4 in the biggest canister, 3 in the smaller canister and 3 other stand alone caps). Hum...

Thanks for the replies. I guess its possible the ground connections to one or more of the replacement electrolytic capacitors I installed isn't so great. under the 4-part canister cap I installed 4 separate caps and had to get creative with getting all of their ground leads back to the...

Hi all, I'm working on an old Sonar FS-23. I have the TX and RX working very nice. There is a hum that comes from the speaker when the volume is turned down, it's pretty loud. Once you turn the volume up and hear static/signals it somewhat drowns the hum out. The hum is very prominent in...

I absolutely would. Sounds like a great deal. Excellent radios...

Old cap: New cap:

Some progress... Found a shop to test all of the tubes. 1. V4 - 6EA8 (service manual labels it 1st Synth Mixer - 4MC Osc.) is shorted 2. V12 - 6AU6 (server manual labels it "Buffer") was giving kind of erratic readings on the tube tester. Every other tube tested excellent. He also...

Just tried replacing V6 and V7 (6BA6's) with two NOS RCA 6HS6 tubes since I had them laying around. I let the radio warm up, connected an antenna and I actually get a "little" bit of static/noise floor when the receiver is powered on now. My CB walkie talkie pegs the needle on the Sonar now and...

Had a little more time to tinker around with it today. Receive is dead on all 23 channels. Radio transmits (connected to load/watt meter) strong modulation with the Turner plus three. Keys a few watts and swings almost 10 (PEP). I don't have a freq counter or any special test equipment but I...

Know where I can get a replacement set of crystals? I see most of the tubes in this radio are available on ebay. I ordered a replacement relay already. Can someone tell me (with this particular radio in mind) the best way to discharge all the lethal HV inside before working on it? I...

Thanks Marconi, I've rolled the channel selector through all 23 channels 4-5 times now. I turned it on today and it's doing the following: no static like you'd expect from a receiver, just a hum that becomes louder and louder as the volume setting increases. Then at about 75% turned up on...

I just picked up a Sonar FS-23 w/ matching BR-21 amp and Turner Plus Three mic. The FS-23 is very dusty inside, bought some compressed air today to clean it out really good tonight before proceeding further. Turned the radio on last night just to see if it would receive (didn't intend to...