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Stax SRM-1/Mk2 Re-cap - Page 3

post #31 of 38
2/19/13 at 1:15am
Quote:
Originally Posted by spritzer View Post

Have you replaced the capacitors in the SRM-Monitor yet, John?  It would be well worth doing and you can even upgrade the size a bit to boost performance. 

No, Birgir - I guess I'm very wary of letting anybody touch it and I figure if it ain't broke, I'm not gonna get it fixed.

The Quad ESL989 repair fiasco nearly drove me mad. 

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post #32 of 38
2/19/13 at 6:52am
Quote:
Originally Posted by loligagger View Post

 

Apparently it was to take the pro bias voltage off the trafo (and thus to compensate for that). I could ask for more details / take more pics if you want.

 

That makes no sense as the voltages in these amps are nowhere near what the Pro bias requires.  What you need is a voltage doubler off the B+ which is then trimmed to +580VDC with a voltage divider. 

 

Quote:
Originally Posted by John Buchanan View Post

No, Birgir - I guess I'm very wary of letting anybody touch it and I figure if it ain't broke, I'm not gonna get it fixed.

The Quad ESL989 repair fiasco nearly drove me mad. 

 

If I'm ever down under then I'll gladly to the swap.  smily_headphones1.gif

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post #33 of 38
2/19/13 at 11:14am

To be fair I did ask him about an amp he hasn't had for about two years now. Who the original owner is isn't much of a secret when you can look through my feedback to find out, but you can try asking padam about it.


Edited by loligagger - 2/19/13 at 11:36am
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post #34 of 38
2/23/13 at 2:00pm

Well I finished recapping my own srm1/mk2, also took a pic of the bottom in case you can see what's going on, spritzer.

 

 

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post #35 of 38
2/23/13 at 2:20pm

Still doesn't make any sense.  You need a voltage doubler (two caps and two diodes) to double the B+ voltage and then trim it down again with a voltage divider.  Just get some 100nf/1000V caps, 1N4007 diodes and the correct resistors and refill the correct slots. 

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post #36 of 38
2/23/13 at 4:41pm
Quote:
Originally Posted by spritzer View Post

If I'm ever down under then I'll gladly to the swap.  smily_headphones1.gif

Birgir,

you would be welcome to come and just say hello. Plenty of stuff to see and do in Perth. 

John

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post #37 of 38
2/23/13 at 9:23pm
Quote:
Originally Posted by spritzer View Post

Still doesn't make any sense.  You need a voltage doubler (two caps and two diodes) to double the B+ voltage and then trim it down again with a voltage divider.  Just get some 100nf/1000V caps, 1N4007 diodes and the correct resistors and refill the correct slots. 

 

Do you have the values of the four resistors (R301-R304) off hand? I'll probably do this after I finish building the amp which will replace it, just in case.

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post #38 of 38
2/24/13 at 2:00am

R301: 51K

R302: 390K

R303: 2.2M

R304: 2.2M

 

The latter two can be substituted for one 4.7M resistor that can handle 600V+.  All the resistors are 1/2W metal film. 

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