Parts Rolling in SSE

[allentodd]

I am building a second SSE that I can use to test whether or not I can hear the difference between various components -- mostly the coupling caps and cathode resistors. I seem to recall one of George's test rigs having a screw-in holder soldered into the pcb in place the cathode resistor to make swapping quick and easy -- any idea what that part is called? Havent been able to figure it out on Mouser or Digikey.

Alternatively I thought I might put in a 5 position switch to be able to quickly flip between different coupling capacitors since I am not sure I could remember the subtle differences if i had to shutdown and swap parts. I am a little worried about leaving multiple charged capacitors disconnected from the circuit though.

Thanks for any help.

Allen

 

[pso]

Digi-Key Part Number: 8737K-ND

 

[allentodd]

excellent! Thank you.

 

[rknize]

I used Mouser 534-8730, which is roughly the same thing except that it lacks the leaf spring that keeps the screw from vibrating out when it is not tightened.

 

[allentodd]

great, now I can order some no matter where my next parts order ends up...

Anyone care to comment on any safety issues inherent in hot swapping between different coupling capacitors?

 

[rknize]

Given the subtle differences between coupling caps, I'd seriously question the utility of such a function. However, if I were to do it I can see two ways.

One would be to leave one side of the caps in the circuit and switch the other side. It would be unwise to throw such a switch while the amp was on. A 250VAC rated switch would probably be able to handle the momentary high voltage, since there is no sustained current involved.

A more elaborate way would be to completely switch out the caps and keep them precharged when not in use. This would make hot switching possible.

Probably not worth it.