Bad Tubes, Bad HotPlate...or?

[jmpatrick]

I recently picked up an 8ohm HotPlate to use as a dummy load on my D.R. I use the slave out on the amp and it works great. I tried using the HotPlate as it was designed, between the speaker out and the cab, but I'm getting a howling sort of feedback. Same thing when I set the H.P. to load and use it's line out. As I mentioned, it's an 8ohm HotPlate, and I'm using an 8ohm mesa cab.

Any ideas?

jp

 

[fdesalvo]

Can you feel any of your tubes vibrating in tandem with the howling noise?

~F

 

[jbird]

I'm not familiar with Hot Plates, but slave outs are to be used with another power amp! Were you still using one of the speaker outs with a load on it, while using the Hot Plate from the slave out?

 

[jmpatrick]

I should have been more clear. I run the slave out to a solid state power amp. That works fine. It's when I run the HotPlate between the D.R.'s speaker out and the cab that I get the noise...

jp