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Good morning all , I've completed the replacement all the components in the selectivity? RC Circuits, tested associated tubes, and confirmed all is working, except the .5 kc selectivity. No

I think I would just leave it alone. You will find the two ground symbols going back to the S-38A at least. The spade symbol is for the B-. In earlier receivers this is the chassis, the other

Hello Richard After reading your comment I do see that the B- and Chassis are two different wiring “ground symbols”. so I need to ask the question about an article by John Fuhring concerning

I was specifically speaking of the power supply interface and safety. Around then, few house circuits were polarized, and I think they were first polarized only if they also had the ground pin[but

Well, partly regulation but the manner of accomplishing it. Also, not all changes in their products were due to regulations. Partly they were fighting competition, some from established U.S.

Re “Hallicrafters re-design is often quite innovative, perhaps new engineers” ya due to the UL imposing that or those captive sockets on the back cover Not only Halli had to change. Sent:

On some S-38 versions the chassis is hot, used as the B- return but in all the cabinet is NOT hot. In earlier versions the chassis is isolated from the cabinet by mounting it and switches, etc, on

Chassis is not hot.? Neutral and hot are floating.? No transformer to keep cost down.? You may have some AC on the chassis due to leaking capacitors. Lee, w0vt

Thanks for that info Glen Please note that my comments here might sound a bit snarky, but are well intended, and come from my own bad assumptions. RE “How did the Hallicrafter's engineers EVER

Don, The link to BAMA site for the Mark 2 page, that I had not found earlier, does have a very nice .jpg image of the re-worked and cleaned up schematic. I'll get that one printed out large for

Hello to the group and thanks to the owner for allowing me to post. Today when visiting a Vintage wireless meeting, I picked up a battered Hallicrafters TW 2000 from the estate of a deceased

Hello Don and others, I have a S-38E Mark 2 and it has the rear mounted potentiometer. I also just received the Haystack capacitor kit and will install these.? Ill FIRST change out the AC wiring to

My experience with Hallicrafters is to keep things wired "as is" when working on Hallicrafters if the receiver was never tampered or worked on in later years. I'd keep the resistor values the same

Ed and all, I’m a bit unsure about who said what to who, and maybe I added some confusion. So to go back, the original post said [in part] “So, why would it have an attenuated sig on 0.5 kc

“the adjustment” means a pot or?? , I might look later at BAMA. Sent: Saturday, October 26, 2024 10:54 PM To: [email protected] Subject: Re: [HallicraftersRadios] Wanted:

"Don Root" <drootofallevil@...> wrote So why would it [notch filter] have an effect on 0.5Kc only? <snip> Hi, Don The other SX-115 IF selectivity positions are not symmetrical with

Would help to know the version. However, it appears that the first E does not have the adjustment on the back panel. not sure what the difference between the Mark 1 and Mark 2 are but both are in

So Glen first needs to find out which version he has? https://bama.edebris.com/manuals/hallicra/s38emk2sch/ on bama is clear , another manual isn’t Sent: Saturday, October 26, 2024 8:47

Richard ,now I see there is quite a bit of overlap in the BAMA splitting of schematic, so my wafer count was probably wrong. I tried to patch the selectivity area together [see ATTACHED ]. I am now

A note: looking at the various handbooks for the E version I find a major difference in the first E and the Mark1 and 2 versions, namely the arrangement of the BFO. In the first one an arrangement