12dc ssr for chip amp problem

[DeanP]

Hey maybe you guys could help me out here.
I just installed a dc trigger ssr in my chip amp but it makes my transformers buzz badly, when I remove the ssr,of course it goes away. It is a CRYDOM SOLID-STATE RELAY D2440-10 dc controlled(3-32vdc, rated to 240v / 40 amps. My trannys are 2x 400va dual 25v. (The relay is in series with the power in to the trannies.) Is the ssr faulty or should I get a mechanical type?
Just a note, I tried it out on my shop radio and I didn't seem to get any buzz.

[halo0925]

Solid state relays can be sensitive to DC components on the AC line, most newer ssr that are optically isolated do not have this problem.
If the ssr is creating a triggered DC component via its internal switching your chip amp could be very sensitive to this depending on construction, bypassing ect.... I would check another ssr then try a standard relay.

[DeanP]

Okay, I guess I am understanding. Since the ac going through the ssr isn't pure due to the internal switch of the ssr.
I will probably go and get a mechanical type, although the town I live in doesn't have to much on the electronics front...back to the internet for buying.