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Old 25th February 2013, 11:17 AM   #1561
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What kind of glue will be good for this purpose?
i thought of those softer mats with two adhesive sides similar to: BERGQUIST - BG405793, just that i have a hard time finding something with two adhesive sides.

norway is a third world country when i comes to electronics distributors
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Old 25th February 2013, 12:04 PM   #1562
RCruz is offline RCruz  Switzerland
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BP100-0.005-00-1112 Bergquist Company | Mouser
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Old 25th February 2013, 12:09 PM   #1563
pdul is offline pdul  Denmark
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norway is a third world country when i comes to electronics distributors
So is Denmark, or though we just got Conrad.DK but at 10 times the prices of Conrad.DE unfortunatly
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Old 25th February 2013, 12:15 PM   #1564
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Plastic body of transistor stick vell with super glue cooper house around them also help but increase thermal impedance (time temparature take to setle)
point was raised by Salas a long while ago and also by me with implementation of larger heat sinks and reduced voltagge to suply.

Maybe new boards to alowd for current sources pairs to be glued togheter is one thing to consider
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Old 25th February 2013, 12:26 PM   #1565
pdul is offline pdul  Denmark
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Thermal Pad 120 x 20 x 1 mm 2 Sides Adhesive for RAM Notebook Consoles VGA VRM | eBay
This seems to be a lot cheaper than Mouser
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Old 25th February 2013, 12:26 PM   #1566
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Agreed I'd like to see the input stage in quads, spaced for those heatsinks.
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Old 25th February 2013, 01:18 PM   #1567
FdW is offline FdW  Netherlands
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He was just trying... Nevertheless, that points towards an interesting insight, that simply by isolating from air movement the drift reduces significantly. Have to try this at home....

great job heinz! let us know your listening experience...
I was expecting that, but just wanted to verify it. The point was brought up before, some while ago I did suggest (for testing) to place a little box (like a match box was suggested) over the transistors and then see what happens. Anyway, if it works (or not), one must take precautions not to isolate the transistors from the environment, they may/will get to hot! (just wanted to make this point ).
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Old 26th February 2013, 06:22 AM   #1568
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OK! Got the babys here on spot now.

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Then somethign else is wrong. Can you please check the voltage on both ends of R5? Should be +/- 0.6V
Checked the servo output again. -It is not 18V; it is +15,57V!

The voltages at R5 are -0,575V and +0,615V.
(At the "good channel they are -0,62 and + 0,563V.)
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Old 26th February 2013, 07:39 AM   #1569
JBdV is offline JBdV  Netherlands
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Potting compound
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Old 26th February 2013, 08:01 AM   #1570
hesener is offline hesener  Germany
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OK! Got the babys here on spot now.



Checked the servo output again. -It is not 18V; it is +15,57V!

The voltages at R5 are -0,575V and +0,615V.
(At the "good channel they are -0,62 and + 0,563V.)
The voltages at R5 look OK, considering the servo output voltage. I would imagine the output voltage of the amplifier is negative, correct? (Sorry I forgot). Could you please measure the voltage at the "Ext RIAA" connector?
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