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Old 18th March 2011, 11:55 PM   #131
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Quote:
Originally Posted by azazello View Post
Анатолий, amazing!!
Thank you Никола!
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Old 19th March 2011, 01:14 AM   #132
kmaier is offline kmaier  United States
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Quote:
Originally Posted by Wavebourn View Post
I wonder, how good is adhesion of mirror finish to Lexan: I think about gluing the plastic mirror between hot toobs and transformers, so no bolts would be visible...

Any experience?
Try this stuff: 3M Transfer Tape 467MP

I use the 2.0 mil stuff (200MP) to apply anti-rattle plates to brake pads. They haven't moved yet.

3M? Adhesive Transfer Tape 467MP

Regards, KM
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Old 19th March 2011, 01:24 AM   #133
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Thank you KM! I will save this information. For the current project Velcro works better; in case I need to replace some transformer I will need to remove the mirror.
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Old 21st March 2011, 01:52 PM   #134
hihopes is offline hihopes  South Africa
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Quote:- "Now I need to make that +12V stabilizer, and increase voltage of the negative stabilizer."

How about using 7 x cheap red LED's @ around 10mA?

Also, do you have an updated schematic and if so, would you please post it?
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Old 21st March 2011, 07:15 PM   #135
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Quote:
Originally Posted by hihopes View Post
Quote:- "Now I need to make that +12V stabilizer, and increase voltage of the negative stabilizer."

How about using 7 x cheap red LED's @ around 10mA?

Also, do you have an updated schematic and if so, would you please post it?
The schematic is still the same, except 6J9P trioded instead of 6N16B paralleled, and one more 4P1L in parallel to the existing one (including filament voltage drop resistor and bias control resistor), and 2K4 transformer instead of 5K transformer.
Speaking of 3'rd grid bias, I decided to go without it, since 1'st drive by cathode follower is adequate.
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Old 21st March 2011, 08:08 PM   #136
hihopes is offline hihopes  South Africa
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I thought you said 3rd grid bias increased linearity? Or was it an insignificant difference?
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Old 21st March 2011, 08:12 PM   #137
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Quote:
Originally Posted by hihopes View Post
I thought you said 3rd grid bias increased linearity? Or was it an insignificant difference?
It increased linearity with less positive 1'st grid drive needed, but requires higher negative bias of the 1'st grid. The amp sounds nice without this trick, so I decided not to deal with such complications: I have limited negative voltage supply. May be I will try it later, carefully measure and compare results.
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Old 21st March 2011, 08:32 PM   #138
hihopes is offline hihopes  South Africa
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OK, thanks for the explanation. Will you run measurements on the amp eventually?
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Old 21st March 2011, 09:21 PM   #139
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Quote:
Originally Posted by hihopes View Post
OK, thanks for the explanation. Will you run measurements on the amp eventually?
Yes!

But before that, I have to finish input selector, attenuator, remote control, and phono stage.
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Old 24th March 2011, 04:02 AM   #140
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By the way, here is a rear panel: speaker outpurs, 4 switchable inputs in the left corner, and in the right corner inputs for MC and MM, with a switch between them. I decided to use a 5-pin female XLR for MC input. MC input will be balanced.

Do you know if some standard for XLR inputs for MC phono exist?

Click the image to open in full size.
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