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Randy, I’ve been working on a SX-110, which uses the same type of instruction, and it’s confusing and seems counter-intuitive for peaking the first IF transformer. Once you’ve identified the

New to the forum and restoring an SX-71. I'm trying to go through the alignment procedure in the manual. I'm stuck at Step 2 adjusting the IF coil associated with the 455 kHz crystal (adjusting tank

The links were to worldradiohistory.orgThis site has a perfectly enormous collection of stuff on it .? I suggest exploring.? QST is on the ARRL site but I believe one must be a member to access the

Hi Richard and friends too I don’t know where they reside other than somewhere in the clouds. I just put “qst 1946” into google and that’s what I got …Oct came first and amazing there was

The last one has 8 pages on the receiver and I didn't count but at least 30 cooperative dealer ads featuring it.? Hallicrafters was really pushing it.??BTW a really thick edition? A reaction to

Steve; and dedicated followers; I see no indication of variations or changes to the 42 in MY second edition Ostermans or in MY Dachis 1996 printing. They managed to find the later revision info to

Per the Osterman book, the SX-42 was on the market from 1947 – 1950. However, information on another site shows that it was advertised as far back as the December ’46 issue of Radio News (see

When did the SX 42 come on the market?? Hallicrafters advertised it as the first really new post war receiver.? FM broadcasting began experimentally in 1936 according to FCC records .? By 1946

On the SX-42: Osterman’s book indicates that there were several circuit changes during the production years of this model. One of the back stories appears to be what happened with FM radio. From

Jacques; Holy Moly! as we used to say, no wonder we are in no-mans’ land. Continuing the SX-42 diversion…I saw some of the detailed changes sheets on the BAMA site too, and they seem to address

Yes, you understand correctly i guess the pot was replaced, and works as you describe. The tone pot was also replaced with the switch type, and it switches in an aftermarket calibrator. I am not sure

The RF gain pot on the SX-71 has no "click", unlike the volume control/a.c. power switch. On the SX-71 and other receivers, the S-meter works properly only when AGC is on and the RF gain control is at

Hi Don, The different produced versions of the SX-42 made me scratch my head big time… Let’s say that in the first versions (according to the schematic 89D210) the first 7H7 is identified as a

I have a suspicion that Hallicrafters, seeking their necessary profits, sought to design the best receivers they could using the most economical parts available to them, which may have varied from

Made me wonder too.? The 7H7 is a remote cut off tube similar to the 6SG7.? One would expect a sharp cut off tube as an FM limiter.? And how is it used as the AM detector? I am stuck with the

Jacques and the gang Do you/we believe that an early version of the schematic was much the same as later versions BUT the old drawing was in error by calling the 7H7 a Limiter, when all the time it

Greetings to the Group: I have given up on the original Hallicrafters PS-500 design.?? If you look at the various documentation, the SR-400 Cyclone (the radio that it is supposed to power) specifies

Hi all, There is no 6SC7 in the SX-42. The tubes used are (from the 89D257 latest schematic). 1st RF and 2nd RF: 6AG5 Local Oscillator & Mixer: 7F8 1st IF: 6SK7 2nd IF: 6SG7 3rd IF: 7H7 Limiter & AM

Depend on WHICH diagram… I.E. which production version of the SX-42… 73, Jacques, VE2JFE in Montreal The SX-42 schematic shows a 7H7 as the third IF, printed on the diagram. 73 – Steve, KW4H

The SX-42 schematic shows a 7H7 as the third IF, printed on the diagram. 73 – Steve, KW4H From: <[email protected]> on behalf of don Root <drootofallevil@...> Reply-To: