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The one you really want is the "Jumper" board. It is by far the one I have used the most. It allows you to do tests on the radio without the DR7 installed. I rarely use any of the other extenders.

The PLATE meter also went from 400 to 500 mA full scale. Mic jack moved to the side. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from Proton Mail for iOS

John, I scanned a full set of original Drake extender boards as well as the DR-7 jumper board and a NB-7 jumper board. Hopefully this provides what you need. I'll leave them in a Dropbox folder for a

I could do that but where would you put yet more radios? And the postage would knock another hole in your bank account. -- Richard Loken VE6BSV : "...underneath those tuques we wear, Athabasca,

Here is link to pictures of the switch.? Wish they were better pictures but that is all I have.? Ignore the paint finish pictures at end.? I also refinished the cabinet.

Richard Loken writes: Gee, Richard, you could just box it up and send it back to me :-) --lyndon

I have experienced dirty pushbuttons and small electrolytics that failed miserably in my RV75. They were Capar branded. If you have those replace them. 73 -Jim NU0C "Rick Boswell"

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