Author Topic: Need Good Sunn amp Tech, Please Help  (Read 3834 times)

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Offline mratcliffe

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Need Good Sunn amp Tech, Please Help
« on: May 17, 2007, 10:52:25 am »
Hi,

Second request for a good amp tech in the Houston area to service my Sunn Sonaro.

I'm getting desperate so I would settle for any recomendations on service anywhere, even if I have to ship it to a good shop.

TIA

Mark

Offline Soundmasterg

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Re: Need Good Sunn amp Tech, Please Help
« Reply #1 on: May 17, 2007, 07:42:45 pm »
Beware of shipping heavy tube amps...the shipping companies will destroy them because they literally throw the boxes around. The burdon of shipping something safely is on you to package it in a sufficient way to withstand the abuse the shipping companies subject every package to. Double boxing, shipping tubes in a seperate package, adding hard foam to the box so the amp can't move around at all inside of it, etc., are all good practices.

As far as a tech down your way.....I have no idea who is down there. You could possibly look up Gerald Weber, though I don't know if where he is located is at all close to you, plus I hear he is having health issues lately, plus he is expensive.

I could probably do the work myself if I wasn't so busy with other things. There are three good amp techs up here locally besides me who could do the work but you would have to ship the amp to Portland Oregon. Conrad Sundholm is also up here but I don't know if he is into doing repair work.

What is wrong with the amp?

Greg

Offline mratcliffe

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Re: Need Good Sunn amp Tech, Please Help
« Reply #2 on: May 18, 2007, 08:19:44 am »
Hi Thanks for the advice.

It make mysterious clicking noise. I am not sure if it is power tubes or a cap arcing. It powers on and plays, but I'm not pressing it.

I got it off ebay so no telling. It looks real clean on the inside but the output transformer is not the original one so I'd just as soon have it checked out and the pots cleaned etc.

I did some searches and I think I might have some good leads. I don't think I am going to chance shipping it and run the risk of damage by shipping. It is in too pristine condition.


Offline Soundmasterg

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Re: Need Good Sunn amp Tech, Please Help
« Reply #3 on: May 18, 2007, 06:25:43 pm »
Does the power transformer show any signs of overheating? Wax on the top of it or something? The clicking is either an oscillation of some sort, or the power transformer or output transformer could internally be arcing a bit, or it could also be a cap as you mentioned. If it is an oscillation, it can be very hard to track down.

Offline mratcliffe

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Re: Need Good Sunn amp Tech, Please Help
« Reply #4 on: May 18, 2007, 07:07:41 pm »
No, the power transformer shows no signs like you mentioned. It looks fairly new, quite clean andvery large. Like the size I had in my sorado.

Offline po-mo preschool

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Re: Need Good Sunn amp Tech, Please Help
« Reply #5 on: May 19, 2007, 10:52:58 am »
Soundmasterg, that's really interesting. My Sorado was oscillating when I got it and had a couple blown OTs in its past -- do you think they were related? That would put my mind at ease, since the oscillation is now fixed.

Offline jaywalker

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Re: Need Good Sunn amp Tech, Please Help
« Reply #6 on: May 20, 2007, 06:31:52 pm »
Give Ross a call at 210-521-2677   http://www.ampmonster.com/   San Antonio

John :-D

Offline Soundmasterg

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Re: Need Good Sunn amp Tech, Please Help
« Reply #7 on: May 21, 2007, 01:11:27 pm »
po-mo, the OT failures and oscillations could be related. The stock Sunn layout is prone to oscillations unless everything is just right. It breaks some layout rules like running wires in parallel with each other for long distances, and having the OT close to the preamp. That said, it usually isn't a problem with most of the Sunn amps.

Offline Sparks

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Re: Need Good Sunn amp Tech, Please Help
« Reply #8 on: June 07, 2007, 02:29:31 pm »
If you need any help with it shoot me an e-mail. I have been through mine from top to bottom and she sound great now.