| Vintage Sony Reel to Reel, bad play head? [message #334757] |
Fri, 18 April 2008 17:08  |
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 J-Ho
Messages: 7
Registered: April 2008
Location: Tucson, AZ |
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I recently picked up a Sony TC350 from a haul-away guy, and it has a little problem. I cleaned it up on the outside and in, made a couple mechanical adjustments to tighten up its movement, revitalized rubber components, cleaned the heads, and let her rip. All works great, but after an undetermined amount of time in 'play' the left channel meter will begin to (what I can only describe as) bounce rapidly, which looks to be at 22Hz on a spectrum analyzer, but it renders audio on that channel useless. I suspected it was built up charge on the heads from the unit being approx. 40 years old, so I de-magged it, and it seemed to be fixed, but after more time in play, it comes back. If I let the machine sit off/unplugged over night, it doesn't show up again for a while. It happens whether there is a tape threaded or not, and only while monitoring from tape, in play.
I'm out of ideas, can anyone help?
Josh
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| Re: Vintage Sony Reel to Reel, bad play head? [message #336465 is a reply to message #334757 ] |
Fri, 25 April 2008 04:06  |
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J-Ho
Messages: 7
Registered: April 2008
Location: Tucson, AZ |
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so, i haven't been able to find freeze spray anywhere in town...and i really hate waiting for things in the mail...so i haven't tried that yet.
i poked around on the repro card to try to shake things up a bit, no change, but i noticed an opamp that is just before the play head, and started poking at it, and it makes all kinds of noise when i touch the contacts and affects the "wobble" quite a bit (doesn't really stop it, just...replaces it...?...with different noise). i'm wondering if it could be this opamp causing the problem.
does that sound possible?
if so, it would be a snap to replace, but i have no idea where to get a replacement, and in the event that the exact part is no longer in production, how do i decide what would be analogous to it? (oh yeah, i dropped the analog reference. booya.)
let me know
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