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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:

Hello n7qmm25 and others YES; Depending on font etc and goobers in printing C and G look quite similar Let’s just say the C that I see in Dachis was a poor print of a G or my eyes are really tired

My 62 has 7H7 , and the 62a has 6SG7 in it's place

It was tired eyes and a transcription error. The 7H7 is the third IF. 73, Steve, KW4H From: <[email protected]> on behalf of n7qmm25 <n7qmm25@...> Reply-To:

My SX 42 has 6SK7, 6SG7 and 7H7. Clearly stamped into the metal chassis. Do you supposed one had tired eyes and thought he saw a C instead of a G?

Don, I just checked, and yes – there’s a third IF tube for the SX-42 – the 7H7. I overlooked that. FYI, my Osterman book is the fourth edition. 73 – Steve, KW4H From:

Scott, and Steve and the gang: I think Steve clarified a mistake re the sx-110 , but he listed IF tubes for others and never said anything about my comment on the sx-42 . he listed “SX-42 (1947-50)

Hi, I am wondering if my RF sensitivity control is working correctly, possibly it may have been modified? When you turn the gain down from the click, the signal seems to be muted from the bottom, as

A recent posting got me to looking through my archives. I found the following short discussion that may be of interest to some. In this discussion we will be looking at the high voltage bleeder

I may be in error, I have both the SX-62 and SX-62A, and everywhere I read, said there was a SX-42 version, so I "assumed" , yep there's that word.. there was a SX-42A, My mistake. The SX-62 and 62A