Trigger relay add needed to turn on power of ST-120 from my pre-amp

Hi, I saw somewhere on here a small relay circuit board and mini jack to wire output. This was so that the trigger voltage output from my preamp could power on my new St-120 , like it did my original PS Audio SS amp. I am searching but now I am unable to find that post. Can someone show me what I need please. It would be appreciated. Thanks! Scott

smoorenc wrote:Hi, I saw somewhere on here a small relay circuit board and mini jack to wire output. This was so that the trigger voltage output from my preamp could power on my new St-120 , like it did my original PS Audio SS amp. I am searching but now I am unable to find that post. Can someone show me what I need please. It would be appreciated. Thanks! Scott

This is what you need :
https://www.mouser.se/ProductDetail/Crydom/LND4450C?qs=xZ%2FP%252Ba9zWqYUASw9UR3BIQ%3D%3D

It may be installed inside the amp, connected in parallell with the circuit breaker and
with a connector for the trigger signal.

The really good thing with these is that they break and make in the zero crossing of AC,
thus eliminating most of the sharp "bangs" that a conventional relay creates.

peterh wrote:

smoorenc wrote:Hi, I saw somewhere on here a small relay circuit board and mini jack to wire output. This was so that the trigger voltage output from my preamp could power on my new St-120 , like it did my original PS Audio SS amp. I am searching but now I am unable to find that post. Can someone show me what I need please. It would be appreciated. Thanks! Scott

This is what you need :
https://www.mouser.se/ProductDetail/Crydom/LND4450C?qs=xZ%2FP%252Ba9zWqYUASw9UR3BIQ%3D%3D

It may be installed inside the amp, connected in parallell with the circuit breaker and
with a connector for the trigger signal.

The really good thing with these is that they break and make in the zero crossing of AC,
thus eliminating most of the sharp "bangs" that a conventional relay creates.

Thanks! It is a very nice looking relay!

This is what you need :
https://www.mouser.se/ProductDetail/Crydom/LND4450C?qs=xZ%2FP%252Ba9zWqYUASw9UR3BIQ%3D%3D

It may be installed inside the amp, connected in parallell with the circuit breaker and
with a connector for the trigger signal.

The really good thing with these is that they break and make in the zero crossing of AC,
thus eliminating most of the sharp "bangs" that a conventional relay creates.
[/quote]

Thanks! It is a very nice looking relay![/quote]

It all worked like a champ! I Got a Crydom LND2425 relay and a MJ-3502 female jack from Mouser. I mounted to the rear. The relay fit "sandwiched" between the main transformer and the bottom of the chassey perfectly. Thanks!