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Ahh Jim , yes I guess it means that too many. I use pre-octal [it doesn’t sound so demonstrative], but I am trying to confirm that I was really sending what the AI experts know. Do you agree with

Richard, loctal / loktal ..s were spoken about in this 1938-12 article: https://www.worldradiohistory.com/Archive-Radio-Today/30s/Radio-Today-1938-12.pdf pdf 20 ----- but March 1939 revealed some data

Are the SR-160/SR-500/SR-150 control knobs the same size as the HT-44/SX-117 knobs? Thanks. 73, Scott WA9WFA

I wouldn't worry abut the secondary voltage.? However, I have bucking transformers on my outlets to lower the commercial AC down from 120v. Question...? You wouldn't happen to have something

I tend to agree with your feeling that the voltages are high because no current is being drawn. Here are the measurements you requested. These were done with the original 6CX8 and 6DE7. I also

No lamp in tune or AM.? Only CW.? Just checked. -- Joe Hutchens AJ8MH - Radio Marquette, MI

I still feel like V1 isn't doing much.? Have you tried a new 6CX8? Have you checked the heater voltage?? How about any tube socket grounds to the chassis?? If all the voltages are high, current

The -50 vdc on the grid is the effect of grid leak bias. It is developed across R9 and R10. It will only reach -50vdc with proper drive and normal power output. Walt Cates, WD0GOF

Hi Joe, Thanks for the reply. I left a few things out in my first post. As you suggest, I have RF at V1, same as the crystal frequency, 7.125. I can trace the rf signal all the way from the

Sounds like you don't have any RF at V1.? I'm assuming you're using xtal control.? S1 should be in XTAL.? I have a jumper across? TA1 3 and 4 and a key plugged into the key jack.? You should be

Since you state you cannot get any grid drive probably is the root of your problem.? Troubleshoot backwards and find out where you lose the grid drive.k6lr

Hi all, New member here and recently retired, have been a ham since 1967 and started to fix/refurb old ham radio equipment in my leisure time now. So far successful with some old receivers..Knight Kit

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 date

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 dimensions of

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 7

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

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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