I was listening to my ST 70 the other day with my brother and all if a sudden thus constant quick popping noise started coming from the right speaker. Has anybody ever heard of or experienced this? I have no clue. I have a recording of it but I dont know how to post it. Any help would be greatly appreciated.
3 posters
Popping Noise
Zimmer64- Posts : 123
Join date : 2013-01-29
Age : 60
Location : Switzerland
What you describe could be tube arching. Look on Youtube. There are samples to compare with what you are hearing.
Bob Latino- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
It could be a bad 7199 driver tube (on an original type Dynaco ST-70) on that channel ... Try swapping the driver tubes from one side to the other to see if the popping noise changes sides. If it does ... Just replace the bad 7199 ..
Bob
Bob
AMCjeep- Posts : 8
Join date : 2013-05-04
Oops I should have mentioned that it is an upgraded driver boatd from Triode. I have a 12bh7 & ef86 tubes not 7199's. I looked on youtube but couldnt find anything like my problem. I have moved my tubes from one side, however i think i fixed it. I basically opened it up and literally resoldered every joint. Found some questionable ones (this was my first ever build), reflowed all resistors and caps on the driver board, and swapped out all driver board tubes. So far so good, and she sounds so much better. Thank you all for your postings, this forum has always helped me out. Thanks
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