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131.161.149.184
In Reply to: RE: Tube Rush and Tube Hiss Different Channels posted by Berrell88 on February 21, 2023 at 06:38:19
Did you swap the R&L input from the tuner to see if the noise is coming from the tuner?
Follow Ups:
I did not swap the ic's on the tuner. I will, thanks. There is a problem with one particular station, a classical music station and my favorite station, that is close by and presents noise in that one channel. That problem persists to a lesser degree using another tubed pre. Other stations further away with equivalent wattage come in much clearer. Go figure.
But let me return to my main point. When you turn on the DHT preamp regardless of the line stage employed, there is normal rush in the left channel and a shrill hiss in the right channel.
Tubes can generate extra noise, a rushing or hissing, Microphonics, and other sounds deemed 'extra' and not desirable -
This is what started the Tube Testing practice.
Unfortunately, some of the sounds are 'normal' others are a result of age, and others still are the result of the circuit-
and Interconnect cables
Assuming that the unit was once quiet, and the interconnects have a ground shield that IS connected at each end, then we are down to tube age -
(Sounds like you have a Shindo Preamp - so I will presume that the circuit is good)
Do you have a spare set of tubes?
If yes, try them out if it regains its quiet condition - then that is the issue...
Happy Listening
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