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Thank you, Don. No, the set was not operating when I acquired it last year. It is dead on all bands. Over the winter I through it and replaced all resistors and capacitors, upgraded the power cord to

Thank you, Jacques. The problem is on all bands. I have replaced all the resistors and capacitors in this set except for a large mica cap buried under the oscillator coil assembly. I was hoping not to

A DMM and a VTVM are essentially the same. I prefer the term "electronic voltmeter". The voltages for the S-20R were probably taken with a passive VOM. I don't remember if the meter

Hello Tom Around the HF, especially the LO, I wonder if you can trust a DMM having only wires {no isolation probe } at some pins. It never did work while you have had it? Assume, you tried

Hi Tom, The triode section of the 6K8 is effectively not oscillating, and that explain all the voltage readings you got. There should be an open coil somewhere, or an open capacitor in the

Newish member of this group, first time posting. I have an S-20R in need of repair. I am not a trained technician and am not particularly good at interpreting symptoms. However, I do have the chassis

Ok Dwight, I’m planning a trip to the observatory in the next few weeks pending weather. I’ll need to get contact and address from you. Do you want a deposit to hold the receiver (and possibly

No, you are the first one to claim it. So I will wait until you are in the area to hand it over to you.? The other Collins radios in the photo are also up for sale.

BTW, have you sold your R-274? Tom ?N5AMA

Well, you and I seem to differ on the value of that thread. I learned several things from folks here who have a wealth of knowledge. 73, Maynard W6PAP

So new thread started on the same dead horse. how many weeks will this one run? 52 HOPE IT BEGINS TO WORK

So new thread started on the same dead horse. how many weeks will this one run?

Hi Jim , and all; revising numbering makes it tough to compare things !!!! So the Halli C62 function remains despite our communication inability. I guess that it one reason I often take a snip

Maynard FYI S-40 [no suffix] https://bama.edebris.com/download/hallicra/s40techman/s40techman.djvu This seems to have no C62 and looks like “your” 40A at first glance ..SO maybe you have

The S-40B Photofact Folder that I copied calls it C7 but it is still a 2.2 pF cap just as is C62.? Sam's has a format that they follow so their component designations are not the same as

Maynard, yes wording is tough. “C62” had been started.. then it moved To me it showed that it was thought to be needed for a simple coil, but not for a transformer .. A version Then

And my S-40A schematic is from Sam's Photofacts (via the Web) and it doesn't have C62 as in your schematic nor does it use independent designation of each component, but labels them with numbers

Hi, Don, When I said that there is no C62 equivalent in the S-40A, I meant that there is no capacitor like C62 that is connected around the switching and resonant circuits so that it is completely

Maynard on the S-40A, C62 is in use on band 2 only but connects V1 and V2 like in the B version …I think. We need somebody to LRC a sample switch. Sent: Thursday, February 27, 2025 11:16

Note that the S-40A uses an entirely different arrangement of coils and capacitors and has no equivalent to C62 in the S-40B. So why is the S-40B equipped with C62? Maybe switch S1B in the S-85