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C5A (BS variable) measures: 34-8pF. -- Emanuele (IU1KNR). https://egirland.blogspot.com

Hello Tom, I believe that the "bubbles" in the original choke encapsulation just came from when the coal tar was poured in during manufacture. There is no possibility that the part "overheated"

Just a note of appreciation for Walt Cates’ generosity In offering downloads of his SR 500 repair manual free of charge. I don’t own an SR 500 but sure appreciate his spirit. Hams like Walt make

So...the SR-160 can be converted to resemble an SR-500 by changing the finals to 6DQ5s, adding a cooling fan, and a few other changes. 1.? Could a similar QRO modification be inflicted upon an

Jim, that waveform is what I previously commented on. Looks like a base frequency of 60 with third harmonic. the 3rd harmonic is generated by the PT magnetizing current and it along with the 60 HZ

Jim, we were working on the same idea. Here is my resonance frequencies table give the measured values. I added 10pF to count for min capacitance of the BS variable (estimated) as per Don's

Jacques, it is not much maybe but where is the min cap of the BS? What is the dial frequency at the very top of the band [min cap] is !.6kc really min capacitance. Agree, even with a small change

Hi Emanuele, From your measurements: BAND 1: C7A = 450pF, L3(C&D) = 200?H Fr = 530.5kHz (1/(6.2832 x SQRT(L x C))) C7A = 50pF, L3(C&D) = 200?H Fr = 1591.5 kHz BAND 2: C7A = 450pF,

Hi Jim,? Well that's not what I wanted to hear, but I understand. I'm actively looking for a suitable replacement choke. The on I substituted in was all I had laying around and figured it would be

There is no socket conversion needed. The 6DQ5 is a direct "plug and play". Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A majority of acceptance is not proof of

*Jim* , great job! *Don* , remember: 1600-500=1100 so we have 110KHz/DIV; 1600-220=1380 .. close enough. So Jim's peak stay exactly where it should: dial @1400KHz !! peak at 1380KHz. His tank works as

Thank you Walt for your SR-160 and SR-500 information, weak points, and the finals. ?I think I've read an early post of yours talking about converting the 8236 tube socket to 6DQ5. ?I didn't have a

I replied to Bob privately. 73, Scott WA9WFA

Jim thanks from us! so both are similar, peaking too low Poor low band may be due to No “C 62” as in the S40B ?? Sent: Wednesday, February 19, 2025 9:51 PM To:

That's what I wanted to know. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

I am not sure that the problem is resolved.? CH2 was replaced with a similar value choke with less winding resistance so it will have higher Q.? Higher Q will affect the audio filter curve so there

Greetings to the Group: I attempted to replicate Emanuele's measurement of the RF tank circuit.?? This required that I construct an RTMA dummy antenna, which turned out to be a bit of a chore; I

In one test, I removed the original choke from the chassis, still wired in place though and still had the hum so connection to the chassis makes no difference. Tom Sent: Wednesday, February

Hello Emanuele, Did you see any part number on the Main Tuning Capacitor (C7) ?? It should end with 341… As you seems to have a LCR meter, can you also measure C7A (the section of the main

Emanuele Real good pics! The knowledge that it looks original helps reduce speculation that it has been modified and that is causing the problem.. good to know about that. The trimmers for band 4