AN/URM-25D or -25F Signal Generator Repair Hints and Comments

These units are still excellent today, but after 50 years or so could stand a little work and many which supposedly work correctly, don't. I'm told Dallas Langford published an excellent "URM-25 Notes" article in the Hollow State Newsletter which is mandatory reading for those wanting to really restore their URM-25 signal generators.

Manuals for both the URM-25D and URM-25F (and a heck of a lot of other stuff) are available from me on the HBR Receiver CD for $10 postpaid in the US or $12 Worldwide.

If you have a non working unit, these are some things I look for (after working on about 10 generators). The HBR Receiver Site has additioanl tube equipment debug: