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Richard and Jim, I got caught on the top paragraphs, and did not go thru it all.. but…!!! As I have seen it, at 10mfd, C44 is hopefully holding the “reduced B+” steady for both parts of the

Emanuele, very good that you did all this, you can let your brain cool off now nor a bit. First, do you have any idea if this is an early run, or a later one?. See what is in red first! Richard

Greetings to the group: I see I will have to go back and duplicate Emanuele's measurement setup exactly; I can do that but it will take a while. In the mean time, I have taken some more pictures with

Sweep of MIX tanks: Setup is the same as ANT but the injection point is V1pin8 and the probing point is V2pin8. The signal in band 1 is very low (effect of lack of coupling between V1 and v2). I had

I suppose I have to reply to each comment. The plate load is the impedance in the plate circuit between supply voltage and plate, that develops the signal output. In the half of the 6SC7 that the bass

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