Originally Posted by Torqdog
OK, so I replaced my RCAs from my C-2 to my newly acquired(used) A-51 with XLRs and happily reported here that the no good nasty hum noise be gone........so I thought. After a couple of weeks of closer analysis, I've come to discover all is not as I thought. Here's my problem...... when I first power up my system, there is virtually no hum noise eminating from the speakers hooked to the A-51. HOWEVER, once the A-51 warms up, the hum returns though no-where near as loud as it was using the RCAs. Weird huh?!!! The level of noise is tolerable and only heard when I put my ear up close to the speaker but knowing that it exists is buggin me.
The other thing I'm beginning to notice is that the A-51 runs quite a bit warmer than the A-31. Case in point, last night I was listening to two channel CDs with no signal going to the A-51. After a couple hours, the A-51 was considerably warmer to the touch than the A-31. It seems strange to me that the amp receiving an audio signal (A-31) was running cooler than the amp(A-51) that was only powered up but not receiving a signal. Weird huh?!!!
I know there's a few of you out there with similar setups. I'm curious to hear your thoughts and experience.
My first question would be...why do you have the A51 on if you're only listening to a stereo source, and not running that source thru DPL, dts neo-6. No point having the A51 on. But even sitting idle, the A51 is still a 5 channel not a 3 channel, so there has to be more heat generated.
When I have my Citation amp connected to the L/R mains, I don't turn on my HCA2205A, if I am only listening to a stereo source. And when the 2205A is on its not that hot.
You say you bought the A51 used, maybe that was the reason (the hum) is why the first owner decided to sell it.
Then again, maybe its still something to do with your circuits in that garage.