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Old 26th February 2013, 08:40 PM   #1
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Default Parts Rolling in SSE

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
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Old 26th February 2013, 09:53 PM   #2
pso is offline pso  Spain
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Old 26th February 2013, 10:50 PM   #3
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excellent! Thank you.
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Old 27th February 2013, 02:34 AM   #4
rknize is offline rknize  United States
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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.
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Old 27th February 2013, 03:14 PM   #5
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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?
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Old 27th February 2013, 04:45 PM   #6
rknize is offline rknize  United States
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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.
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