[Vintage-Audio] preamp troubleshooting

[Rudy Rutenber]

You may be reading too much into this... sounds to me like a bad tube or
dirty socket.
Rudy

----- Original Message -----
From: "Rick Larson" <rick@mnbrewers.com>
To: <vintage-audio@mailman.qth.net>
Sent: Wednesday, August 21, 2002 8:11 AM
Subject: [Vintage-Audio] preamp troubleshooting


> My McIntosh C26 preamp started cracking, poping, hissing, ...
> in the left channel.  Praying, turning it off and on again, and
> crying didn't seem to help.  Finally, no sound in the one channel.
>
> Earlier in the year, I replaced two power supply caps to remove
> a hum from both channels.
>
> I want to get this working again.  Tools I have include: DVM,
> soldering iron, c26 service and owners manuals.  I can read a
> schematic.
>
> I can get access to a scope and function generator if needed.
>
> The service manual has voltage test points that I can test.
>
> Should I short the inputs first?
> Would simple voltage checks be enough?
> Other ideas?
>
> I could scan in the schematic if someone would like to help
> "if the voltage is not V at this point, part Y might be bad..."
>
> If anyone hasn't seen the inside of a Mac, it is beautiful.
> After working on old tube gear and other 'kits', I'm in awe in the
> detail and neatness of the workmanship (craftmanship?).
>
> Anyone in the Twin Cities want to stop by? :-)
>
> BTW, I swapped in my trusty Hafler 101 to the joy of my 8 year old
> "I love that one Dad" he said.
>
> rick
> --
> mac, marantz, dynaco, bozak, magnapan, fisher, hafler, leach, swtp,
> teac, jbl, plus some new stuff
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