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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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Old 16th May 2019, 09:08 PM   #1321
Hicoco is offline Hicoco  France
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by redjr View Post
I fitted some MUR820G diodes to DS series regulated PS (blue board) and all is well. Instead of temps of 140F, I'm getting more respectable temps of between 75-85F. Both regulators at around ~78F. And these temps are under load. I've adjusted the trim pots to get +-14volts ouput. Everything is cool to the touch. I'm happy and the sound of my DAC output stage is great!

Thanks Hicoco for suggesting the 820Gs.
Great !!!! i did not work on it yet..Did you change the 47nf??
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Old 17th May 2019, 01:46 AM   #1322
redjr is offline redjr  United States
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Hicoco View Post
Great !!!! i did not work on it yet..Did you change the 47nf??
No.
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Old 4th June 2019, 01:02 PM   #1323
AMPMAN is offline AMPMAN
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Default carl huff

hi carl do you still have parts for doug self preamp regards. richard woollcott aka ampman..rwoollcott97@gmail.com
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Old 4th June 2019, 05:11 PM   #1324
Carl_Huff is offline Carl_Huff  United States
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Quote:
Originally Posted by AMPMAN View Post
hi carl do you still have parts for doug self preamp regards. richard woollcott aka ampman..rwoollcott97@gmail.com
Richard,

Please check your private messages here on this forum and/ or your gmail account. Thanks!
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Old 5th June 2019, 04:47 AM   #1325
AMPMAN is offline AMPMAN
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Hi carl i seem to have lost 3 pots from my original order so do you 3 you can sell me regards ampman.
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Old 5th June 2019, 06:12 AM   #1326
Carl_Huff is offline Carl_Huff  United States
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Quote:
Originally Posted by AMPMAN View Post
Hi carl i seem to have lost 3 pots from my original order so do you 3 you can sell me regards ampman.
Richard,

I should have some on hand. Please email me your shipping details.
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Old 7th June 2019, 05:31 PM   #1327
Hicoco is offline Hicoco  France
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Carl_Huff View Post
The bubbles at the top are the rail voltage adjustment pots and the large bubble at the bottom is where you select input AC voltage. Once assembled you will have a premium grade series regulated adjustable power supply
Click the image to open in full size.
Hi Carl, i just plug all the part together for the first time today (PSU, Preamp, I/O, selector) no music yet, just oscilloscope with 1000Kz/150mV at the input.
I noticed after 10 minutes that the PSU is warm at the BD139 (61℃) and BD140 (50℃). I have 200mA (17V+) and 180mA (17V-) with the selector at 1er input (XLR).
With no load @ the PSU, i don't have this issue.
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Old 7th June 2019, 05:50 PM   #1328
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
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Quote:
Originally Posted by Hicoco View Post
Hi Carl, i just plug all the part together for the first time today (PSU, Preamp, I/O, selector) no music yet, just oscilloscope with 1000Kz/150mV at the input.
I noticed after 10 minutes that the PSU is warm at the BD139 (61℃) and BD140 (50℃). I have 200mA (17V+) and 180mA (17V-) with the selector at 1er input (XLR).
With no load @ the PSU, i don't have this issue.
Hmm, did you put a dab of thermal grease under the BD139/BD140 devices and their heatsinks?

It sounds to me that you are not getting a good thermal couple between those transistors and their respective heatsinks.

Please note that some BD139/BD140s have an exposed metal mounting surface that must be electrically isolated from it's respective heatsink using a mica or silicon insulator.
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Old 7th June 2019, 06:45 PM   #1329
Mark Tillotson is offline Mark Tillotson
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Silicone insulator perhaps, not silicon!
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Old 7th June 2019, 07:25 PM   #1330
Carl_Huff is offline Carl_Huff  United States
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Quote:
Originally Posted by Mark Tillotson View Post
Silicone insulator perhaps, not silicon!
Ha, ha ... Yes! I should proofread what write.

Here is an example: TO-220 Silicone Insulator 10 pcs.
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