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I miss Tom Kneitel. Here's one to make you think twice. https://www.ebay.com/itm/375106990323?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5336136228&customid=&toolid=10001&mkevt=1 73

Never heard of Metrosound. If I interpret the date code right, looks like 1985. Maybe. The Korean CB radios from that era weren't all that special. Midland models from Korea in that era were famously terrible. The name "Metrosound" doesn't show up at Wikipedia. The Howard Sams index 1946-2001...

Seems to me I posted this some time in the last ten or twelve years, but here it is again. This is just faster than sifting through a forum search. N O M A D R A D I O 1615 Bardstown Road Established 1975 Louisville KY 40205 (502)...

If one transformer is big and the other one is small, this is the grid-drive version that requires a high negative DC voltage to control the driver tubes' control grids. The big one provides B+ and heater/relay voltages. The small one is for the negative grid bias supply. If it has two identical...

The Maco 300 isn't a product name, it's a product line. It would get redesigned every production run, seemed like. Five, tubes, six or seven. One power transformer or two, two fat Foster's Lager-size filter caps or three skinny ones. Grid-driven driver tubes (grounded cathode) or cathode...

Back in the 90s, when someone brought us a Uniden-made SSB radio with a failed final we adopted the habit of asking "You didn't key it into a Palomar 300A, did you? If the answer was yes, they got told not to put it in line with that radio until the 300A got fixed. Only had to have a couple of...

The newest Cobra 2000GTL you can buy has passed the "awkward age" of thirty years old by now. If the mileage is low, the need to re-cap could be a few years down the road. And if it was run 24/7, it's probably overdue for that treatment. 73

If I had to guess, I'd predict that nobody on that list is still doing business, and few if any are still with us at all. Charley's daughter Cheri was selling off remaining stock of parts and kits until a few years ago on fleabay. Used the username "charleythree-cheri". She hasn't had anything...

There's yer problem. If it was powered from a wall outlet with serious voltage drop this causes the temperature of the thoriated-tungsten filament to fall while keyed up. Pulling power from that kind of filament with a reduced temperature will make the tube prematurely weak. There are two...

Just wish I could remember what year the name on the front of that Grant model shown above changed from "President" to "Uniden". Some time in the early to mid 1980s? 73

Got that right. Always wondered what became of Justin DePolis. He seemed to have a clue about the technical stuff, or maybe he just talked a good game. Hasn't popped up once that I've seen since he got run out of town on a rail, as it were. You forgot Billy D. Ward. Definitely a strange stop...

So here is your problem. The transformer boosts the audio voltage from about 12 Volts peak-to-peak up to about twice that, 24 Volts peak to peak or more. One end of the step-up secondary winding has the 12 Volt DC power supply feeding into it. What comes out the other end of that winding is that...

JJ points out something I overlooked. A restored radio that was built better than the new models is a good deal if you value performance. Had a friend who would install an updated radio in DAK Mark X cabinets. His hearing was damaged in Vietnam serving as an artillery officer. Said he couldn't...

This is where a 'scope pays for itself If you can hear your signal on a monitor radio, this chip is almost certainly okay. It fails VERY rarely, and you transmit signal is most likely being lost downstream from that chip. Having a way to "follow" the signal downstream stage by stage would be...

The question of recapping a solid-state CB is as much an issue of mileage as age. If it's a tube radio, there is no question. It's just too old. 40 year old capacitors that were never used usually check okay. But once it gets installed, the life you'll get won't be another 40 years. It will...

Yes, I sell stuff on fleabay. Mostly I restrict hawking it here unless it serves to answer someone's question, or to announce a new toy. This falls in the latter category. A shameless plug, if you will. Maybe that's what I should call this set of four RF load resistors, the Shameless Plugs...

Knock knock! Who's there? Elvis. Elvis who? How soon we forget. Been 8 years since the last one of these we fixed up, pretty sure. Had forgotten now many relays that one has in it. There was no preamp in the one below, but this model has more relays than you would expect. Didn't snap a...

The original sure is an "ice cube" package relay. The original Potter and Brumfield prefix for this style was "KH". Literally dozens of vendors have made that style relay. Finding a new-fangled LED in a 1/2-inch hole fixture might be easier than an incandescent light like that one. A longer...

A gargle search for K4DPK peak adapter turned up reviews, this thread on this forum, and one site that has his VFO stabilizer, but no peak adapter. His page on qrz.com says this: E-mail k4dpk at comcast.net Might be worth a try. 73

Probably. For a while. Pretty sure the contacts in that one are rated for about half the current of the original. The MY4 has 5 Amp contacts. The old one is probably rated at 10 Amps per contact. The full-size relay I use is TE Connectivity type KUP-14D15-12. Mouser stock number is...