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Re: Need help with HT-40 MK 1 troubleshooting


 

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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!


On Apr 6, 2025, at 11:40?PM, Larry - WA2DGD via groups.io <wa2dgd@...> wrote:

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[Edited Message Follows]

Joe,
Thanks for the info from the mods. Had a break through early this morning.
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I kept staring at the function switch and something didn't look right, so I enlarged the photo of the function switch for the Mark 1, which is different than the standard HT40.
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I thought this was a factory assembled unit, all the tube sockets and terminal strips are riveted with lock washers. But in it's 60 year life someone else was in there. The function switch had one wire about 3 terminals off in the wrong direction. At 2 am this morning I fixed that wire and all the voltages fell into place.? I went to sleep.
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Just got back from days activites. I put a new 6CX8 and new 6DQ5 in the rig. Oddly it still shows no grid current in tune but when I went to AM or CW I have power out. On CW I get about 55 watts out and can modulate the rig and hear myself on AM. The Drive control does function to peak the output, just have to figure out why it's not showing on the meter.
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Thank you for all your help.?
Larry
WA2DGD
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PS:? found a ground missing on the meter switch, now I can read Grid Current. Now to get it on the air.

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