Yogi
Screenwriter
- Joined
- Jul 25, 2002
- Messages
- 1,741
Its been over a month I have been living with an ASL 2004DT tube linestage in my system. Its connected right before the SS amp. The sound is wonderful and dimensional but I still have this nagging hum issue. There is hum from both speakers when the tube pre is on. This hum is independent of volume level. I have tried cheater plugs, wiring the amp and the preamp chassis together, change of interconnects and change of power cords but that hum remians. Last night I noticed a funny thing and thats when I decided its time to get professional help.
I usually turn on the preamp and let it warm up before turning on the amp so I dont let any spikes and DC surges associated with tube warm up go thru my speakers. Last night I turned on the amp and there was a hum thru my left speaker even with the preamp turned off. Yes you heard it right even with the preamp off there was hum from my left speaker and left speaker only. The right speaker was dead silent. I disconnected everything else from the preamp and the hum was still there. I swapped the interconnects going to the amp and the hum came back on the right speaker. So it was definetly coming from the left channel of the preamp. Next I disconnected the power cord on the preamp and there was dead silence in both channels.
So here is the situation that prompted me to seek out professional opinion as its beyond me as to what could cause this: hum from the left channel of the preamp even when its turned off with the power cord connected. With the power cord disconnected there is no hum from any channel. What could be going on guys?
Sorry for the long post, but I need some professional help here.
Regards,
I usually turn on the preamp and let it warm up before turning on the amp so I dont let any spikes and DC surges associated with tube warm up go thru my speakers. Last night I turned on the amp and there was a hum thru my left speaker even with the preamp turned off. Yes you heard it right even with the preamp off there was hum from my left speaker and left speaker only. The right speaker was dead silent. I disconnected everything else from the preamp and the hum was still there. I swapped the interconnects going to the amp and the hum came back on the right speaker. So it was definetly coming from the left channel of the preamp. Next I disconnected the power cord on the preamp and there was dead silence in both channels.
So here is the situation that prompted me to seek out professional opinion as its beyond me as to what could cause this: hum from the left channel of the preamp even when its turned off with the power cord connected. With the power cord disconnected there is no hum from any channel. What could be going on guys?
Sorry for the long post, but I need some professional help here.
Regards,