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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

Hi Jim, Loosening the tension nut seems to have helped a lot.? Think I'll leave it where it is now. May get around to replacing the red and amber panel lamps tomorrow. 73 Stan KM4HQE

Most likely it is oxidation on the connector contacts. It is also possible that one or more of the female contacts has lost tension for some reason. It's easy to remove the contacts from the connector

Here ya go. /g/DRAKE-RADIO/topic/102134063#74026 And other vernier hits. /g/DRAKE-RADIO/search?p=created%2C0%2C%2C1%2C2%2C0%2C0&q=vernier

Hi All, I finally got around to taking my L4B off the bench and work on replacing the vernier drive on the plate cap.? Looks like the one referenced in the doc on the WB4HFN site

Bill, check the wires going into the crimp. If this connector has been moved a lot, you may have one conductor that's breaking from the crimp. If that's not the case, try the DeOxIt. 73, Steve Wedge,

It is most likely some of the deoxit will work on those connectors as well. I found some very small brushes at Harbor Freight near me. I think they are used for cleaning spray paint nozzles so you

First, I accidently posted this on a different Group. Hope that is not a terrible? break in protocol. I have owned this Drake TR7 for probably 15 years or more. I loved the radio. Even when I had to

I added a few comments to the OpenSCAD source code and tidied up the file a bit. New versions have been uploaded. I also renamed them to mn4c-rangeswitch.{scad,stl,gcode}. --lyndon