One more piece of information. The hissing doesn't start until about 1 minute after the input is anything other than SSP. Assuming the starting point was the SSP or coming out of standby. This happened every time after I swapped out a tube trying to diagnose the issue earlier in the week. The previous instances were after powering the pre, this time the same thing happened after switching the source from SSP(HT passthrough) to the CD player. The pre has been running for a few hours so it's nice a warmed up. It seems more and more relevant considering it's a consistant issue after about a minute.
preamp tube hiss from my SF Line 1
I'm trying to diagnose a very audible hissing sound that recently showed up. The symptoms are, hissing sound coming from the right speaker. Its very noticable from my chair. It does not get louder as I turn up the volume. The sound is there regardless of which input I select. It does go away when I switch on the HT Passthrough. I thought I had a bad tube and have tried swapping out each of the three tubes ont the right channel and it makes no difference. All the tubes are NOS Amperex and I've been using them for a while now without any issue. This all started when I swapped out the bottom pair of tubes with some better ones that I had. All my tubes were recently tested so I know they still have plenty of life in them. Any ideas? I find it unlikely that I have multiple noisy tubes, but of course I could try putting the stock ones in all three right positions. Any insight would be appriciated.
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- 20 posts total
- 20 posts total