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Help required with faulty Darkvoice 337se

post #1 of 17
8/6/10 at 8:34am
Thread Starter 

My 337se has died on the R/H channel.Over the past few weeks there has been an intermittent hissing and crackling.

Tried swapping out the tubes and disconnecting interconnects but still same noise.

 

Yesterday i got a horrible loud crackling and then no noise from the r/h side.

 

Would like to know if anyone in the northwest of England would like to take a look at my beloved amp and see if they can fix it,of course i will pay for work carried out.

 

John

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post #2 of 17
8/8/10 at 3:41am
Thread Starter 

Actually,anywhere in England.

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post #3 of 17
8/8/10 at 3:29pm

Try Tony at Coherent

 

http://www.coherent-systems.co.uk/repairs.asp

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post #4 of 17
8/8/10 at 3:38pm
Thread Starter 

Thanks hawkhead,might just give them a try 

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post #5 of 17
8/28/10 at 3:54am
Thread Starter 

Found out it is the aluminium housed wirewound resistor which has blown (20w 430 ohm).

 

Was advised to replace these on both channels with Arcol 25w 470 ohm resistors,but within a few hours both of these blew.

 

Any advice would be greatly appreciated.

 

John

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post #6 of 17
9/3/11 at 9:58pm

Did you ever get your amp sorted out?

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post #7 of 17
9/9/11 at 10:07am
Thread Starter 

Hi Les

 

Yes I did, Yuking sent me some uprated high power resistors which I soldered in myself.

The amp never sounded better and has worked flawlessly since.

 

John

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post #8 of 17
9/9/11 at 10:21am

Glad it worked out John, thanx for the update!

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post #9 of 17
9/12/11 at 1:59pm
Funny, I was doing a bit of research regarding heat temperatures and wire wound power resistors. I came across another article where a DV amp had under speced power resistors.
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post #10 of 17
9/13/11 at 7:38am

A lot of those aluminium housed resistors are rated as being mounted on a heatsink, otherwise the power  rating is halved..

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post #11 of 17
9/13/11 at 10:14am

Here's the inside of mine.  I have the SE version(shortly to go on sale).

 

Should those big yellow resistors be mounted to a heatsink?

 

The PIC is Large!

 

http://www.turbonet.biz/misc/337seReview/AAA_1428.JPG

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post #12 of 17
9/13/11 at 12:58pm

John,

 

I hope you don’t mind me linking this here. It might be of help to others;

 

http://rockgrotto.proboards.com/index.cgi?board=m&action=print&thread=5703

 

Cheers

John 

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post #13 of 17
9/13/11 at 5:11pm

John,

   Do you have any pix of the amp post repair?

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post #14 of 17
9/14/11 at 12:02am
Thread Starter 

My friend has the amp at the moment Les, but I will take some pics when ( if ) I get it back.

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post #15 of 17
9/14/11 at 12:27am

Thanx!

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