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Jacques, yes, but it just makes things harder to understand. I was originally focused on when and how each L3 coil shorts to ground or doesn't, and quickly decided them must be using the mutual

RichardComments inserted in the text below.Regards,JimLogic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

Oops, I overlooked the price. Sounds great. Tom

Hi Dwight, I have an observatory in Pie Town, New Mexico and plan a trip there as soon as it warms up a bit. I’m now sure exactly where you live but I would like to buy your receiver. What are you

Last night I was able to find another 4hy choke. I knew I had one around just couldn't put my finger on it. It was salvaged from an old R390A AF module.?Dawned on me last night at 8:30 to go check

Could be....? One other tid bit, whenever I switch between in/out there is a loud thump in the speaker - annoying to say the least.

Another coincidence - I just happen to have that book at the office! I quickly looked it up and there it is. Hopefully today is a slow day and I can spend some time reading. Also saw in the index a

Thanks - will try a couple more. I have tapped on it a few times with no change, but have not tried a different one - yet....

Funny, as I was driving into work I thought the same thing, now I have to wait until tonight to try it.......... Will update later

FWIW, I think the best manual for the SX-28A to be found on-line is the military manual TM11-874, which may be found on BAMA at: <https://bama.edebris.com/manuals/military/an-grr-2>

Ch2 and C-43 form a parallel resonant circuit, a tank, if you will. It is in the plate lead of the pre amplifier half of the 6SC7. When the switch is in the position marked IN on the diagram it is

So the hum in question might just be 60 cycle leakage instead of the originally stated 120 cycle?? I guess that this is possible but what is the explanation for the loss of the hum when SW10 is in

Not the right coils used initially, or was it made on a Friday 13 ? 73, Jacques, VE2JFE in Montreal De : [email protected] <[email protected]> De la part de don Root Envoyé :

Don, OK, understand what you mean by “L3 serve both bands” but that cannot explain why either coil cannot be tuned properly to the low frequency alignment value. 73, Jacques, VE2JFE in Montreal De

Emanuele Re Here is what I get: Band 1: main tune dial at 0.54MHz - the bottom of band 1 (C7A fully meshed - maximum capacity) cid:[email protected] ref only.I shriveled it..don

The 6SC7 is used as a "floating paraphase" phase splitter. At least in the fixed bias version it is very sensitive to hum in the bias supply. Maybe not in the self bias version as used here. However,

6SC7 tubes are renown for developing heater-cathode leakage and for developing inter-element shorts and leakage as well. Often, if you shake one near your ear, you can hear loose whatever rattling

Try another tube. Maybe heater to cathode leakageSent from my Galaxy

Hi Jacques, Took the grids to ground, no hum so it looks like it is coming from the 6SC7 area. Narrowing it down………. I appreciate all of the discussion going on – thank you everyone. We’ll

Jacques, yes or a mysterious additional capacitance. But it is fishy that both L3 and L6 exhibit the same thing and on both bands. Out the door Friday 5pm before Christmas?? From: