[Ron Ramirez]

Those brown slide switches break a lot more often than the regular black ones. Replacements go for a premium on Pay-Bay.

Yes indeed. I consider myself very fortunate to have that 175-T junker chassis. As I see it, it finally proved to be good for something.

You know, if I had to do it over again, I might have tried what Arran suggested. It was probably more work to add those push-on terminals to the 400's wiring than it would have been to switch (no pun intended) the terminal boards, or to put the 175-T switch sliders into the 400 switches. That is, assuming the sliders and actuators were compatible with one another. I've seen two different types of Fisher actuators and they are not compatible with one another.

DO NOT plug in any of the Russian replacements. They will ruin the sockets.

Russ is absolutely right. The pins of the new Electro-Harmonix 7868 tubes are larger than the originals. Once you get them in (and from what I have read, they will go in but it isn't easy the first time due to the larger pins), you are then forever limited to using E-H 7868 tubes in those sockets.

OTOH, if you want new 7868 tubes, you are pretty much limited to using the Electro-Harmonix tubes unless you can stumble across a set of NOS American made 7868s.