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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: Yamamoto A-08S Repair? posted by kgturner on January 12, 2012 at 15:31:15:
So I decided to do some in depth checking today. I inserted a pair of shorting RCA's so that only the amplifier is connected to the speakers. My preamp and other sources are all off and out of the loop entirely.
With the A-08S on and a new pair of Shuguang 2A3C's inserted, I hear popping out of the left channel. I turned the A-08S off and inserted a pair of EML 45's and I still hear popping out of the left channel.
I turned the A-08S off and reversed the speaker cables and now the popping is coming out of the right channel speaker (which is connected to the A-08S left channel).
I turned the A-08S off and returned the speaker cables to their correct position and the popping is coming out of the left channel again.
I turned the A-08S off and replaced the 80 rectifier tube and the popping is still coming out of the left channel.
I turned the A-08S off and replaced the 717A driver tubes and the popping in the left channel stopped, but I hear it ever so faintly in the right channel. I have several pairs of 717A that I purchased several years ago. I'm starting to wonder if they weren't as "NOS" testing as they were proclaimed to be. I turned my preamp on and noticed that when I'd insert a pair of the 717A's, some times the left channel would cut out, but if I reversed the tubes, both channels played fine. ???!!!
As a last ditch effort, I put a new speaker cable on just the left channel and the popping is still present though significantly more silent. When the preamp was on using the old cable, I could hear the popping across the room. Now I have to put my ear against the tweeter to hear the popping even with the preamp on.
I put the old left channel cable on the right channel and there was no popping. I then put the old left channel cable back in place and the popping sound remains more silent than before. I guess I'm gonna run some contact cleaner across all the connections and see what happens. This is confusing me to say the least.
Kevin T
"religion is the opiate of the masses"
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Follow Ups
- RE: Yamamoto A-08S Repair? - kgturner 11:41:08 01/14/12 (4)
- Now you know why I'm considering an ALL SS system.... - Rod M 19:52:27 01/15/12 (3)
- I know the feeling... - kgturner 08:32:24 01/16/12 (2)
- this may have already been suggested - FenderLover 07:34:13 01/20/12 (1)
- RE: this may have already been suggested - kgturner 08:07:14 01/20/12 (0)
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