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Old 18th April 2013, 11:10 PM   #641
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Quote:
Originally Posted by jacco vermeulen View Post
Soldering a parallel resistor is tiresome.
Yes, and ugly too You can simply attach a trimpot, fine-tune, and replace it with a fixed resistor. This is how I did it, and it turned out quite easy to do. You don't even have to solder/desolder it: chose a piece of cable that tightly fits in the hole

(And you don't need to do it for both resistors. Either R9 or R10 will do).
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Old 19th April 2013, 02:11 AM   #642
BlueRob is offline BlueRob  Mexico
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Originally Posted by jackinnj View Post
It's simple -- Nelson used them in various First Watt designs -- they are inexpensive (availble from Digikey) and compare quite favorably measurement-wise with the more expensive variety. I claim no prize for originality.
Thanks for the comment Jack....I think I´ll use precision metal film since I have them handy, next time I order some components will include some metal oxide ones and give them a try.
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Old 28th April 2013, 09:33 PM   #643
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Just a general comment, I have had some problems getting the 2N5457 Jfet.
Mouser only have large quantity for sale and RS no longer stock them. I have found this little supplier who will do matched pairs or quads at a "reasonable" price and a very reasonable postage of just £1.95. They also have some good priced chrome LED mounts too.
http://stompville.co.uk/shop/
No not as cheap as can be got from the trade suppliers but then 2500 JFets is a bit over the top just to match a pair or two up. :-)
Martin

Last edited by Pingushome; 28th April 2013 at 09:36 PM.
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Old 30th April 2013, 09:13 PM   #644
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A quick update from above post;
2N5457 Jfets arrived from Stompville today 1st calss letter post all seem OK and very quick dispatch too.
LED mounts are OK ...good value.
Martin
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Old 16th May 2013, 05:17 AM   #645
RNMarsh is online now RNMarsh  United States
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Location: 2457 Cascade Trail; Cool, CA. 95614
How is the build and listening coming along?

-Richard
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Old 18th May 2013, 12:54 PM   #646
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Quote:
Originally Posted by RNMarsh View Post
How is the build and listening coming along?

-Richard
Hi,
I have got some of the transistors and am just waiting to get a min order amount to buy the othere bits from Mouser rather than pay thier rip off postage.
PSU's and JLH ripple eaters built and working.
I'll Keep you all informed when I get all the bits together
Martin
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Old 18th May 2013, 06:53 PM   #647
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Can any pls give me some advise,
The heatsinks CafeNoir suggests are Aavid 581002B02500G these are 17.4 K/W from Mouser however I can get some ML26AAG heatsink RS No712-4206 from RS but these are 17.9K/W will they be ok or should I go for a more efficient heatsink?
I will be able to mount these vertically not horizontally as they suggest in the data sheet.
How hot does this amp get I will be putting in an enclosure which may not be vented.... not sure yet have to see what is available
any advice appreciated
Martin.

Last edited by Pingushome; 18th May 2013 at 07:00 PM.
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Old 19th May 2013, 08:51 AM   #648
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Originally Posted by Pingushome View Post
Can any pls give me some advise,
The heatsinks CafeNoir suggests are Aavid 581002B02500G these are 17.4 K/W from Mouser however I can get some ML26AAG heatsink RS No712-4206 from RS but these are 17.9K/W will they be ok or should I go for a more efficient heatsink?
I will be able to mount these vertically not horizontally as they suggest in the data sheet.
How hot does this amp get I will be putting in an enclosure which may not be vented.... not sure yet have to see what is available
any advice appreciated
Martin.
OOOps,
Forget that last post I have just re read these posts and found the answer
But now I am on the way to sorting out the bits any guidance or thoughts on volume pots/attens would be helpfull. Alps Blue shunted a la World Desgns forum or ladder atten from FleaBay?
Regards Martin
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Old 19th May 2013, 09:04 AM   #649
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I was thinking of something like this

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Old 14th June 2013, 02:52 AM   #650
RNMarsh is online now RNMarsh  United States
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Location: 2457 Cascade Trail; Cool, CA. 95614
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Originally Posted by RNMarsh View Post
How is the build and listening coming along?

-Richard
?? awfully quiet out there... .
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