Here's a picture of Jim's board in my T-17.

73 Mark K3MSB

On Thu, Apr 30, 2026 at 10:49 PM ac2eu--- via MRCA <mrca@mailman.qth.net> wrote:

Yes, you wouldn't know it had any mod at all , except that it would produce strong clean modulation.

I used to have a 1 inch square pcb that fit into most T-17 designs, but I sold out of them..

I've modified and simplified the design since then, so I'd have to re-design the pcb. anyway.

It's not a big demand item, so I make them on a proto board as needed for restorations.

On Thursday, April 30, 2026 at 10:12:44 PM EDT, Jason WA6BBQ <w6iee.73@gmail.com> wrote:

Of the finished product? It’ll just look like a normal T-17!

On Thu, Apr 30, 2026 at 19:07 B. Smith via MRCA <mrca@mailman.qth.net> wrote:

Perhaps you could take a photo and copy the diagrams- I could post it to my web page with due credit of course.
73 k4che

http://k4che.com/T-17/T-17.htm

On 4/29/2026 8:46 PM, ac2eu@yahoo.com wrote:

There also more "electronic" mods using an electret microphone.

I made a stable two transistor self biasing carbon mic replacement and also a less stable but very  simple single transistor type.

They both will produce clearer modulation than a NEW T-17 ever did . Carbon has very poor frequency response and they justt get worse over time.

On Wednesday, April 29, 2026 at 08:06:21 PM EDT, B. Smith via MRCA <mrca@mailman.qth.net> wrote:

The Air Show and Military Rally season has started. Perhaps it is time to consider an overhaul or repair of your T-17. There are several mods for more consistent output unless you enjoy banging the T-17 on the side of the table. That black taped telephone button repair is kind of tacky.
Z

http://k4che.com/T-17/T-17.htm

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