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MONTHLY REMINDER--Our Amateur Radio Groups Below are our amateur radio related groups. Some may be new enough there are only a few members. If one of those interests you, join it and give it some

Sorry I don't have one, but my Elmer W1LHY did in 1955. I wondered, how did it come to be? Aha, an engineer designed it! I will be an engineer! And I did! First job out of school was National. 73

... but I have a NC-125 and I am having trouble getting the Pitch Control (BFO) to work. If anyone has one (NC125)? I'd ask you to pull the plastic knob & measure the resistance from chassis ground

The only thing I’ve done, in my case with my NCL-2000 amplifier which uses two 8122 tubes, is to install a series glitch resistor in the B+ line. By the way, 8122 tubes are plentiful as surplus,

Hi, Anyone modified their NCX-1000 output section to better protect the expensive 8122 tube? Several expert source provide direction how to extend the operating life of the tube and to reduce SSB

Can not figure out how to edit message so posting reply to my own message:? FOUND - no longer searching for these.

I’m finally getting around to working with my SW-3 receiver (type 36 & 37) and it doesn’t use the normal 4 pin “plug & play” supplies. Looking at the schematic tells me there is 135v and 67v

I just obtained a HRO-500 that is wired for 240v operation. It had been sold to and used by an European owner. The manual describes a power terminal board and how to change the wiring for 120v

Hi all.? I'm just new to this particular group.? I'm finally getting through some of my 40+ year hoard and working on some receivers, and I've uncovered the National pile!? Among the hoard are some

Hello All, Looking for plug in set for HRO-60T. I have found 50T packs for sale, but nothing for a Sixty.? Can 50T coils be used in a sixty? Thanks! K5AKM

Coil packs come in bandspread and non-bandspread versions.? Can the bandspread coil packs be quickly tuned, in general, and then fine tuned using a bandspread function, or does their use restrict

Hi all, I am looking for one or more *dead* Penta Labs 8122 tubes. Must be Penta Labs specifically. Bob,? K7DYB

Thanks Bob, I’ll check it out. 73, Doug/WA1TUT

Hi All, Here is a writeup that I posted on the Hallicrafters forum that may be applicable here... For several months, I have been trying to get the blower to start reliably at power on. Because the

Grainger should have shaft adapters to adapt one size to another. Donald KX8K <sparks06524@...> wrote: ---------------------------------------------------- Some ham radio groups

Has anyone figured out a good substitute for the blower motor? I’ve seen suggestions that Grainger might have one but none in their catalog would seem to work. I think the original motor shaft is

Vintage National Speaker For Sale: This speaker is a National speaker, with the National logo on it. I think the model number of the speaker is MCS-8. It looks very close to the NC-46 TS but without

Vintage National Speaker For Sale: This speaker is a National speaker, with the National logo on it. It apparently was made to go with the NC-46 receiver, but I am sure could be used with others as

Hello Jack, Thanks for your input. I’ve got two NCL-2000’s. For one I bought “Radio Dan’s” kit of an external keying box with a design similar to what you suggest. It works fine and

Doug - I just saw this post and you may already have a solution. If not, then you could use a triac to switch the ac relay and a PNP transistor to switch the triac. The transistor would be turned on