I am just guessing here but it’s a calculated guess. It appears that the problem is likely in the AGC circuit as it is active at the start of the record. If the capacitors have been replaced properly and all the resistors have been confirmed within tolerance then about the only thing left is the tubes, I would start by substituting these with new ones or at very least test them with a tester that has a very sensitive shorts and gas test capability. I believe in this model they are 6bj6 tubes. On second thought I’d try just removing them altogether and see if it makes a difference as this should disable this circuit. Now, as I’m thinking I recall some other components like diodes in the circuit of these stereo amplifiers. I’d try removing the 6bj6 tubes as a first step. Most people run without them anyway. Mauro
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On Dec 23, 2024, at 11:51 PM, Henrik Niinimäki via Jukebox-list jukebox-list@lists.netlojix.com wrote:
The Seeburg DS160 amplifier makes a special hiss for about 15 seconds every time a new record starts playing. There is a hiss, even if the needle doesn't even hit the disc. If the needle is raised to the beginning of the record after the record has played for a while, the hissing will no longer be heard. In other words, it seems that the hissing somehow comes after the change in the state of the mute relay. New capacitors have been replaced in the amplifier and it works fine after the initial 15 second hiss has subsided. Where could the fault be? _______________________________________________ Jukebox-list mailing list -- jukebox-list@lists.netlojix.com To unsubscribe send an email to jukebox-list-leave@lists.netlojix.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s Searchable Archives: http://jukebox.markmail.org/