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Unbelievable!!! Good work. It could be just a bad output/drive meter switch… with the VFO, I only get one bar on the drive meter. Joe (AJ8MH-Radio) Sent by Wireless!

Been there; done that about 10 years ago.? I got the recap kit from Hayseed Hamfest.? Link: https://hayseedhamfest.com/collections/hallicrafters-s-series/products/s-40b-re-cap-kit.? Also replaced

i have restored an S40 S40A and a S40B. all are EZ restores. first thing to do is replace all the Caps. then check for out of range resistors last thing is check the tubes. good luck the S40B is a

Joe, Thanks for the info from the mods. Had a break through early this morning. I kept staring at the function switch and something didn't look right, so I enlarged the photo of the function switch

Hello all, this being my first post here.? I recently acquired a Hallicrafters S40-B receiver from a dear friend who went SK.? I had promised to restore it for him, so even though he is gone, I'll

I found this info on the web.? It's from the document "HT-40 Preferred Upgrades.pdf".? You can search for it.? I think it's for the plain HT40 and not the Mark 1.? (I've still been trying to

TA1 Terminals 1&2 have nothing connected to them and 3&4 are shorted together. I'll try and find a youtube video demonstrating the HT40 and see if the neon bulb lights on CW. Next week if no one

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

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,

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