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Hi Don I took off a few layers of insulation to get that far.? The small winding partly obscured by some clear tape near the top of the "gap" is the YEL 5.0 V winding.? The 6.3V winding covers about

Halden, a good and most interestion shot!! I guess you have pealed back the top layer of insulation, which we see at the top. I guess it was taken more from the left side so the right looks a bit

Rick, good to hear your furnace works in the summer, etc etc, But Re the switch, what is the obvious problem now, and what is causing it? I can imagine many reasons, but perhaps it boils down to

I am about to start restoration of an SX-23. ?It works but not perfectly. ?It was apparently recapped early in the plastic capacitor era but needs some cosmetic and mechanical help. ?I am asking

A note about the color code on resistors in the SX-23 and perhaps other receivers of this vintage. ?The colors stand for the same numbers as in current practice but the bands are read differently.

Rick, here's my source for inexpensive SSRs: 5 pcs G3MB-202P on Amazon for USD $8.49.? The ones that arrived are marked "Omron".? One is enough for my experiments with the zero-crossing and

The mic amp in the 44 is designed to achieve full power out with 0.005vrms at the mic input. To test the dynamic mic place a 100K resistor across the mic voice line and repeat the words 3, 4, 3, 4.

When I first got my HT-44 running, I was using a high impedance Heathkit microphone and had no trouble achieving full output from the HT-44 with a relatively low mic gain setting (around 3).? When I

Halden, Well, pretty much any relay would work well.? Several years ago, I used a relay out of a parted out microwave oven to replace the hot surface igniter (HSI) relay in a gas furnace.? Those

Hi Rick, Thanks for sharing your thoughts and the reference to the article about step starts.? Many years ago, I designed step start into scientific equipment I used to make.? It included a tungsten

My Viking Valiant is probably a 1956 vintage transmitter. I am thinking that if,? in 68 years,? the "Bong" didn't hurt anything, it probably never will. Tom Raush W8JI designed most or all the

Halden, good information. I have not yet tried to understand the finals, bias etc, but I guess you are saying when going to STBY it takes a bit of time to unload the power draw, and it takes longer

Hi Don, Yep, the filaments are still loading the transformer so the voltage on one winding shouldn't go haywire by itself. You ask the very important question:? "does it?"? I actually have the

Hi Halden, I’m blue inserted in your original black I noted your idea in the "Re-membered (new to me) HT-37" thread about turning the transmitter off suddenly, possibly leaving some current in L26

Thanks Halden. I can't take credit for the inrush current limiter idea.? Rodger SIngley, WQ9E brought this up in another forum, and also referred to an article in Electric Radio by Jim Garland,

Hi Don, I noted your idea in the "Re-membered (new to me) HT-37" thread about turning the transmitter off suddenly, possibly leaving some current in L26 with no place to go.? At first I was hopeful

OK then, Install an inexpensive delay relay and never worry again about the mythical pause delay off training. Just ram that switch to the OFF position and let the trusted delay board keep the rig in

Hi Paul, my emails inbox is quiet today.. so.. RE “Jim also mentioned the mechanics of the HT-37’s Operation switch. I’m glad someone finally mentioned it as a possible root (or contributing)

Jim, Re your “I would think that one would have to see what the OPERATIONS switch is doing in those first three positions. Based on the manual this seem a most obvious place to begin. Thanks to

PaulI see your point about the 516F-2.? What I had in mind was the KWT-6 which is also a commercial designation and it's high voltage power supply of 2kv @ 500 mA.? AFAIK, this is also a 1958-9