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Update:? I connected my other T-4XC to the setup and discovered that pin 7 of Mixer v3? of my other rig is 240 Volts in stand-by (RX) mode.......? I swapped the 6AU6 but to no evail.? WIll

Is perhaps VOX being tripped ? Is there bias current showing on the transmitter meter? Hopefully some smart people will be along soon with better questions :-) John wrote:

Hi John Thanks for thinking with me. Yes, I have another one, a Sure, but that is shortened when the PTT button is not pushed. Then no signal in SSB is generated, however when switching to AM of

Do you have another microphone to try with this setup? John wrote:

Dear all A small addition: the unwanted signal does not appear when the MODE is switched to CW (of course again in stand-by (RX) mode) of the T-4XC 73 Rob PA9Z

Dear all, A happy new year to everybody on this marvelous group! For weeks I am trying to tackle a weird problem in a recently acquired T-4XC.? In stand-by (or RX) mode, with the TRANCEIVE switch in

Hi Tim So the humming comes from the speaker?? Is it a 60 Hz AC hum, you recon? KR Rob

Hi Rob and thanks for the response. Yes the T-4XB is connected to a R-4B receiver. The hum is present with the receiver turned on or off. I tried as you suggested unplugging each cable one at a time

Yes, but the subject was the neons. Those are the ones that are soldered. Also, I pointed Stan to exact replacements on Mouser. They are still available under the original OEM part number. 73 -Jim

Sent email

It uses two #1850 incandescent lamps. Mark, WB0IQK

Interesting. I have serial 336, I believe, and it doesn’t have the calibrator. I wonder if the rest of yours agrees with the commonly distributed schematic. 73, Steve Wedge, W1ES/4 Time flies like

Dear Tim Interesting problem. Where do you hear this hum? In the R-4B speaker? Assuming you are operating the T-4XB as Twins? Have you decoupled the connecting cables on by one and monitored any

Those are neon lamps. 73 -Jim NU0C "Stan Gammons via groups.io" <buttercup11421@...> wrote: -- 73 -Jim NU0C

I didn't think I'd ever sell this, but a new-to-me shiny (Collins-flavored) object entered my shack last week, so something has to leave, and so... For sale: 1A receiver, S/N 368. 80-10 meters, + WWV.

As the title suggests my T-4XB has a hum when keyed up in cw mode. At first I thought it was sidetone and tried a couple of replacement 6EV7 tubes hoping that was an easy fix but it was not. The more

Well the pointer follows the capacitor, not the knob. 73, Jim W7RY

Carol, All the L4B amps ?I've owned or serviced had a plate tune vernier drive with red pointer that is attached to the vernier, not the knob. 73, Evan, K9SQG

Hello, I recently acquired an L4B that is in great shape electronically and cosmetically, I have refurbished it and installed the Harbach boards in the Amp and PSU.??It appears to function "as

Hi Mark, Thanks for sharing the file. Undecided if I'll try the repair. Seems as though I got things a bit tight when I worked on the plate cap a few years back. Loosening the tension nut and screw