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Mark, Those are dead ends.? Spoke to Bob the other day and he sold off his lot of extender boards years ago, but didn't remember who bought them.? Other avenues have also dried up. 73,? John

Thanks Pete,? ?Got to get it up on my bench and do a visual and mechanical inspection...hopefully that may reveal an obvious problem. 73, John

Thanks Dave.? I do plan to do a thorough mechanical cleaning before proceeding with troubleshooting board by board.? Just got to get it on the bench first. 73, John

Gary & Steve, Gary, 1) The 1st pic I sent is the drive disassembled. However, the only parts missing in the pic are the bearings and the Allen set screws. Compared to your drive, it does look like it

I don't think so.? Unless the shaft is worn like shown in the article I attached above. The non 90degree mounting shaft is just so it can fit the hole in the chassis and allow it to be bent as needed

Mark: Jim Shorney can check in later after work....but I do not believe he ever made TR-7 extender cards to sell to others....or even for himself. That link on Ron's page refers to extender card sets

Interesting and timely thread!? I'm working on a homebrew legal-limit antenna tuner that an old friend of mine started building years ago but did not finish before he passed away in 2018.? I need a

John, Have you checked with Jim Shorney?? He makes the extender boards. Go to Ron's web page here: Drake Membervellia (wb4hfn.com) ( http://www.wb4hfn.com/DRAKE/DrakePartsService.htm ) Mike Bryce,

That drive looks like it has been worked on before and not properly reassembled. There should be a second part that covers the bearings like in the first photo. These drives also need a pre-loading,

The bottom line was that this was not documented. One would need to insert the new layout of the switch onto the latest T-4X schematic. It would probably be simpler to take the B schematic and redo

If it counts up but eventually stops, it could be the transformer core (T2101) on the power supply regulator board.? Its a two piece core and I have had the top half fall out, which kills the +24V

Very interesting Steve. I happen to have 3 T-4X's here.? Each one has a different mode switch! They seem to be from 3 different production runs. 73, Gary WB6OGD

Bill, I just searched for "vernier". Look for this one: Repair and Fabrication of a Preselector Vernier Drive Shows how one guy fixed his which must have looked like yours. I am guessing that the

Bill, It looks like you are missing half of your drive! Your photo looks like mine when dissassembled and half is gone. Look in the Files section, there is an article on how someone fixed his by

Gary, Your drive is similar, but noticeably different. Yours appears to have the bearings enclosed in a shell that I am guessing provides the needed pressure to force the outer (larger) shaft to

Now I remember the research that I did. I compared schematics of the T-4X to the T-4XB and found there were quite a few differences in the keying circuit but it started to look doable. Then I noticed

Search the Files section, there are a few articles on fixing the vernier drives. Attached is another on I had on my disk. All rebuilding and adjustment is done on the drive itself ( the drive is shown

Here is one out of a T-4X. Is yours like this? Sent from my iPhone

The extender boards are the same as any of the other TR7 boards. The only exception is, of course, the DR7 jumper lard. Good luck with that board as it has active components on it. The actual height

Gary, I am suspecting that there is a crimp force part to the solution, but if so, I think that the crimp force has to be set with the long shaft attached. That is the shaft that moves the coil slugs.