| 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 #334870 is a reply to message #334757 ] |
Sat, 19 April 2008 05:51  |
Bill Urick
Messages: 498
Registered: March 2005
Location: Atlanta |
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More likely to be component failure or bad connections on that channel. Not familiar with that machine.
Slap it around a little (while calling it bad names).
If it responds, could be bad solder, dirty connectors.
Are there any channel specific cards you can swap to localize
the problem?
Can you swap the head wires? (tricky, last resort)
Three head machine? Monitoring off the PB vs Rec head could tell you something.
I think the last thing I would suspect would be the heads.
Let's get one thing straight-I'm not an audio engineer and never said I was. I've just got some things I have to record.(IS)
Announcement: Since smilies are frowned upon by the ACS and it is difficult to detect subtle humor in their absence I will be substituting "(IS)" (implied smiley) where appropriate.
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| Re: Vintage Sony Reel to Reel, bad play head? [message #335418 is a reply to message #335276 ] |
Mon, 21 April 2008 18:02 |
Bill Urick
Messages: 498
Registered: March 2005
Location: Atlanta |
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If it's OK till it warms up it could be a transistor or IC. If you can get to the boards and let it warm up into failure mode you might try hitting the components with freeze spray and see if it kills the noise. If you can reproduce this consistently it might direct you to the culprit.
Anyone else feel free to chime in here....
(IS)
Let's get one thing straight-I'm not an audio engineer and never said I was. I've just got some things I have to record.(IS)
Announcement: Since smilies are frowned upon by the ACS and it is difficult to detect subtle humor in their absence I will be substituting "(IS)" (implied smiley) where appropriate.
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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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| Re: Vintage Sony Reel to Reel, bad play head? [message #336741 is a reply to message #334757 ] |
Sat, 26 April 2008 05:42 |
Bill Urick
Messages: 498
Registered: March 2005
Location: Atlanta |
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Are there any numbers on the chip?
Let's get one thing straight-I'm not an audio engineer and never said I was. I've just got some things I have to record.(IS)
Announcement: Since smilies are frowned upon by the ACS and it is difficult to detect subtle humor in their absence I will be substituting "(IS)" (implied smiley) where appropriate.
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| Re: Vintage Sony Reel to Reel, bad play head? [message #337236 is a reply to message #334757 ] |
Mon, 28 April 2008 06:00 |
Bill Urick
Messages: 498
Registered: March 2005
Location: Atlanta |
Active Member |
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I don't believe that is an IC.
It might be best to find a repair tech at this point.
Is there a local shop you could turn this over to?
Let's get one thing straight-I'm not an audio engineer and never said I was. I've just got some things I have to record.(IS)
Announcement: Since smilies are frowned upon by the ACS and it is difficult to detect subtle humor in their absence I will be substituting "(IS)" (implied smiley) where appropriate.
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| Re: I need a 10Mf 10V capacitor [message #338049 is a reply to message #337978 ] |
Wed, 30 April 2008 19:49 |
Bill Urick
Messages: 498
Registered: March 2005
Location: Atlanta |
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Betcha' it's 10 micro-farads.
Just a guess.
Let's get one thing straight-I'm not an audio engineer and never said I was. I've just got some things I have to record.(IS)
Announcement: Since smilies are frowned upon by the ACS and it is difficult to detect subtle humor in their absence I will be substituting "(IS)" (implied smiley) where appropriate.
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| Re: I need a 10Mf 10V capacitor [message #338442 is a reply to message #338164 ] |
Fri, 02 May 2008 05:03 |
Bill Urick
Messages: 498
Registered: March 2005
Location: Atlanta |
Active Member |
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| Jay Kadis wrote on Thu, 01 May 2008 10:35 |
| MagnetoSound wrote on Thu, 01 May 2008 03:54 |
| J-Ho wrote on Wed, 30 April 2008 21:34 |
a billion...billion...billion...billion microfarad....wow.
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Yes, wow!
10 Megafarads. That's going to be, what, about the size of a coffee table?
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A 1 F capacitor is about the size of a coffee can. A 1 MF would be about the size of Rhode Island.
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Not really.
http://www.solarbotics.com/products/cpag1.0f/
1F caps have been used as an alternative to batteries in volatile memory apps for a while now.
Let's get one thing straight-I'm not an audio engineer and never said I was. I've just got some things I have to record.(IS)
Announcement: Since smilies are frowned upon by the ACS and it is difficult to detect subtle humor in their absence I will be substituting "(IS)" (implied smiley) where appropriate.
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