Iím stumped and I need some ideas. I sent my Odyssey Stratos stereo amp in to be converted to Dual Mono last summer. When I received it I connected it to my HT for 16 hour per day burn in, and then back into the big rig. After the conversion it ran warm to hot in the HT which has no SDA speakers.
When I put it back into the main system I connected both SDA cables to the AI-1, which was brand new and just assembled from the group buy conducted by fjross. Everything sounded really good, though there was a little more SDA effect on the right side than the left. I attributed this to the room layout.
From July to January everything worked as it should, and then around mid-January I was playing music one Saturday am and I heard a pop. The left channel stopped working, and when I touched the amp it was hot! So hot I couldnít leave my hand on it. Popped the top and saw two blown fuses, which I replaced. Powered up the amp and the left channel played at about Ĺ the volume of the right.
Called Klaus at Odyssey and he said send it back and weíll get it fixed. Also decided to do some more upgrades while he had it: had him swap out the standard power supply caps to the reference grade (a review coming).
Received the amp back Monday, connected it in the usual way using the AI-1 transformer, and things were great Ė for about 45 minutes. I kept checking the amp temp and it was fine at first. Then it slowly began to get warmer. It then became very hot as above, and all of a sudden a loud hum developed from both speakers. Called Klaus and described the situation to him and he was dumbfounded as he had run it for 4-5 days straight to be sure it was working properly. For him the heat sinks/outer case temp never rose above warm.
I checked all my cables (speaker, ICís from linestage to amp, SDA cable) to be sure that there were no shorts and found nothing out of the ordinary. So at Klausí suggestion I powered up only the left channel (right channel off) and played music for 45 minutes: no hum, the music sounded good and the amp stayed cool to the touch. But . . . I thought it odd that I could hear the SDA signal coming out of the non-powered up right channel (is this a key piece of information?). Though the SDA signal is passed by the AI-1 wouldnít the right channel need to be powered up for the SDA mwís to make sound?
Repeated above with only the right channel powered up with the same result. Now Iím really scratching my head.
On a hunch I removed the AI-1 and left the SDA cable disconnected. Voila! Perfect sound except no SDA effect. Fantastic stereo image, amp ran flawlessly for over two hours at ďwife driven from roomĒ volume. Temp barely warm.
I double checked the connection of the wiring of the AI-1to the BPís and itís correct.
I donít want to get rid of the amp and Iíd like to get the SDA effect back., but I donít know what else to look for, trouble shoot, etc. Any suggestions on how I can proceed, what to check, measure, etc.?
BTW, kudos to Klaus Ė he has been a total gentlemen through all this. I really appreciate good customer service. He was in the process of building a new chassis for me so that when I returned the amp he could convert to mono blocks at no additional cost to me. That is until I discovered that the amp seems fine.