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On Mon, Mar 13, 2023 at 06:06 PM, John K5MO wrote: While it's not easy to determine the exact size of that switch wafer in the photos, I have successfully repaired similar elements by transplanting

Paul Kraemer 5:56pm #69934 ( /g/DRAKE-RADIO/message/69934 ) Peter et al I got the message(s) and I can help with that switch replacement.? I was able to find an inexpensive switch on

While it's not easy to determine the exact size of that switch wafer in the photos, I have successfully repaired similar elements by transplanting contacts from an avaialable switch after carefully

Peter et al I got the message(s) and I can help with that switch replacement.? I was able to find an inexpensive switch on ebay and "adapt" it to repair the MN200 to "better than new".? The switch

I see now that both sides of the switch are tied together (presumably to enhance the power capability of the switch) which may complicate finding a replacement. I think someone mentioned using two

Well that is interesting. That explains why a casual glance at the photographs on eBay do not show any differences. I have a T4XB so, by your desription, it is the better bargain. I also have a C line

I do believe it is one of their wafers but difficult to find the exact. I was in touch with an Ebay seller who sells this type of thing and in all his inventory he had no match. Thanks for the input

Isn't that just a ceramic Centralab wafer? Those can often be found as individual wafers on eBay, etc., with the correct shaft hole and contacts/wiper configuration. The trick is getting the proper

The major change was 8-pole TX filters instead of 4 pole. Then the T-4XC came out with "locked transceive" which had never existed previously. (Meaning there was not an RX vs. TX frequency error.)

Hi Bill, It was possible to get the MC1496 mixer to work as far as conversion gain. The later chip options were simpler to implement. Assuming the Drake AGC circuit hasn’t been changed, most of the

For sure Peter!!? Thanks for the correction.? I worded that wrong. I'll contact Paul and ask for some guidance on that. I do have alternatives now to this unit but I don't want to part it out

The subject says it all: what did Drake change when they went from the T4X and the T4XB? Was there a T4XA? -- Richard Loken VE6BSV : "...underneath those tuques we wear, Athabasca, Alberta Canada :

Yes, with both Fixed Feq buttopns out. RB

Hi Rick Do you have the pushbutton in the TUNE position? When I do (and with both fixed freq buttons OUT) the tuning on my RV75 is slower than the TR7 itself....I'd say maybe 10 degrees of knob motion

Greg, Thanks for your detaioled reply. I did find what looks like to correct connector on eBay. Rick K8EZB

I began checking out a new-to-me RV75 this AM and am seeing some issues I dont yet understand. These are: 1. While the RV75 seems to be working in a basic fashion, the frequency displayed on the TR7

Hi Folks, Can anyone here write back and tell me the height of TR7 boards.? I am building sets of extender boards and need that dimension. Also, if there are technicians here willing to test my

Peter: First...a small correction...not *THE *previous owner...but *A *previous owner. Contact Paul Kramer, K0UYA, for his picture set on how he replaced that switch with a stripped down multiple

Rob, Thanks for sharing your insights on this. What I think you are saying is that AGC attack distortion is a “feature” of some of the designs in the receivers by Collins and Drake, and that this

There is a company on the east coast of ?the US that rebuilds switches. ? Not cheap though. ? Can't ?recall the name of the company.