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Turns out that octal base tubes were introduced by General Electric when they introduced metal tubes, 1935. My memory was incorrect about Locktal base, it was introduced by Sylvania. Don't have a

DonBy "big pin" I was referring to tubes that were common before the arrival of the octal tube around 1935.? The hallicrafters 5T uses all pre-octal tubes found in the RC-11 RCA tube manual (circa

I always understood "big pin" tubes to be those made before octal sockets were introduced. Many octal tubes are essentially the same as earlier "big pin" tubes except for the sockets and

Hi Jim, I have been trying to reply but keep getting diverted. One problem is understanding the definition of a “big pin” tube. How big is “big”? I can find no definition. the 4,6,and older

I did the mod according to the sketch you mentioned, which I happened to see stuck inside the manual when I bought the old HT37. It didn't work for me, so I took it out, So far I haven't been able to

EdThis is surprising.? The maximum service line voltage is 126 volts per ANSI C84.1.? This maximum line voltage has not changed at all since it was first published in 1954.? This is when the 120

https://www.ebay.co.uk/itm/146473408194?_skw=hallicrafters&itmmeta=01JQ8JB30925MVVX5SYTK2T5NM&hash=item221a7ed6c2:g:gl8AAOSwuHVn4pNT&itmprp=enc%3AAQAKAAAA0FkggFvd1GGDu0w3yXCmi1cB%2Bx7DNiyx9Ej9vvogalp

Goes back quite a few years so not that relevant for this discussion. Did have Edison out back then and they verified my readings and said it was due to their tweaking the voltage for other customers

Very nice! BobWA9JIB = = = = =

TU for sharing…..! STAY SAFE AND STAY WELL! Respectfully, Thomas K. Lanieri, NU2W NJ DOH Licensed EMT; PHTLS, AMLS, PHPEC Millenium EMS ARC N.E. BioMedical Services ARC N.E. Disaster

Forwarded from another group, enjoy!https://www.youtube.com/watch?v=-RDRrty9WPQ JimLogic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

EdOut of curiosity, what voltage do you measure on the 240 volt service line, hot to hot at the circuit breaker panel?? You should read close to 240 volts.? Over 250 volts or so is a problem for

Hi Ed, I think I remember something here about someone building an HT-37. I'll have to go back and see if I can find it! Thank-you very much for the suggestions. C85 should be good as I replaced all

Sorry for so long on the reply but a lot going on here. Went back through all my notes on my HT-37 build (yes, did build one, another story). My only problem with my build occurred with original

Wow, I have not heard of Max (4U1UN) being mentioned in a long time. Used to know him well since he used to attend the Canandaigua AWA meets. I was not aware of his passion for Hallicrafters radios.

AFAIK, all of the hallicrafters listed below have metal front panels and are housed in metal cases.? The S-10 / SX-10 did have an optional mahogany?case that the metal case slipped into but I doubt

Richard, now that you mention “curb appeal” at which model did Halli begin to emphasize appearance? Here are some features, looking at Dachis’ book: Early cabinets were wooden, dials seem to

Hallicrafters appealed to a very wide market, from broadcast receivers to professional communications equipment. They made much low cost gear that appealed to those who were just entering ham

It’s also contagious, so be even more careful! Sent: Sunday, March 23, 2025 9:49 AM To: [email protected] Subject: Re: [HallicraftersRadios] New to Group Welcome to the group

Welcome to the group Dan, There is an amazing wealth of information on this group but be careful, collecting can be dangerous. ?I currently have 28 Halli radios on the shelf waiting to be restored.