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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

I just uploaded a procedure written in 2005 by Gary, W8PU to repair a Vernier Drive that might help. Microsoft Word - Vernier Drive Repair - W8PU.doc (groups.io) (

The following files and folders have been uploaded to the Files area of the [email protected] group. * /Vernier Drive Repair - W8PU.pdf (

Bill respond to me direct and maybe we can work out something.? email is bobk6oxn at gmail dot com. 73? Bob K6OXN

Did you notice that four pin connector layout was designed to be impossible to accidentally reverse the polarity? It plugs in either way with the correct connections. It's a little subtlety that I

Thanks Jim, Appreciate it. 73 Bill W4WCS

Thanks Jerry, 73 Bill W4WCS

Tanks Steve, Appreciate it. 73 Bill W4WCS

Thanks Bob, I do have an RV-75. It is the roughest of all in condition. Untested by me. But probably the only one I would sell stand alone. Will advise. 73 Bill W4WCS

Stan, If I remember correctly, I ran into the same problem a couple of times. ?Soldered a piece of brass tubing from the True Value hardware store and it worked fine. 73, Evan, K9SQG

There's a four-pin connector for power on that board. Only two of the pins are used. But power and ground are also brought to the other - unused - pins. I got a new connector, and wired up all four