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Author Topic: Sunn Alpha four  (Read 6222 times)

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Offline David Hicks

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Sunn Alpha four
« on: March 20, 2013, 12:51:28 pm »
Grier Communication in Alabama.  I am new to this site.  Have a customer that brought us a Alpha Four amp.  Input 3 is not working.  Was looking for a schematic.  Saw a post by Don T from 2002.  He said that the diagram was in the service manual area as AlphaPA.  Being new to the site, I don't see the service manual area.  Need a little help.  Thanks.  David Hicks
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Offline Isaac

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Re: Sunn Alpha four
« Reply #1 on: March 20, 2013, 02:00:50 pm »
A lot has changed since 2002, and much of it not for the better.

Seems to me, though, that if you have three working inputs, it shouldn't be that difficult to troubleshoot the fourth.
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Offline loudthud

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Re: Sunn Alpha four
« Reply #2 on: March 20, 2013, 04:11:12 pm »
The Alpha 4 mixer is posted below. The power amp is the same as the Alpha Slave posted in this thread: http://sunnforum.ampage.org/index.php/topic,4634.msg17638.html#msg17638

Keywords: Alpha four mixer schematic
« Last Edit: July 10, 2013, 06:28:02 pm by loudthud »
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Offline Isaac

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Re: Sunn Alpha four
« Reply #3 on: March 20, 2013, 05:03:27 pm »
What good is that going to do him? It doesn't show channel 3! ;)
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Offline David Hicks

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Re: Sunn Alpha four
« Reply #4 on: March 21, 2013, 08:45:15 am »
Thanks for the reply.  David
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Offline Don T

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Re: Sunn Alpha four
« Reply #5 on: March 21, 2013, 03:59:10 pm »
Hello,
CH 3 & 4 are identical to 1 & 2 so It's especially easy with good channels right next to #3 to double check readings. 99% of the time it will be the jacks on the back panel or broken solder joins some where along the pan > volume > main mix bus.

Don T
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It's the ear not the gear.

Offline Isaac

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Re: Sunn Alpha four
« Reply #6 on: March 24, 2013, 07:08:45 pm »
There's an alpha six for sale locally on craigslist. Is there anything "magic" about these mixers?
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Isaac
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