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Old 18th July 2006, 06:31 AM   #1
Mrpong is offline Mrpong  Thailand
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Default Look for tube buffer for inverted LM3875

I'm looking for a schematic used as tube buffer (6DJ8 or 12AU7)input for my inverted LM3875.

And yes..I did searched the chipamp section and found bunch of related threads. Thank you !!
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Old 18th July 2006, 09:54 PM   #2
Nuuk is offline Nuuk  United Kingdom
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1 Google for a pre-amp design using one of those valves.

2 Build a basic GC.

3 Decide on how much gain you need in total and then how much you have in the pre section.

4 Adjust the gain in the GC.
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Old 20th July 2006, 04:21 PM   #3
5150ed is offline 5150ed  Thailand
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6DJ8
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File Type: jpg 6dj8 gainclone.jpg (23.0 KB, 623 views)
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Old 21st July 2006, 09:43 AM   #4
5150ed is offline 5150ed  Thailand
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http://rexdiy.itpart.net/smf/index.php?topic=1973.15
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Old 24th July 2006, 08:09 AM   #5
Mrpong is offline Mrpong  Thailand
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Thank you krub khun 5150ed.
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Old 26th July 2006, 06:52 AM   #6
Luck is offline Luck  China
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Smile Try this one please

6DJ8 OR 6922 OR ECC88 can work so nice in a very low voltage such 60V .....the buffer is very easy to make as the pictures..
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Old 26th July 2006, 06:52 AM   #7
Luck is offline Luck  China
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Smile Or try this schamatics

I had made an sample as in the schamatics, i used 58V....
the resistors i changed to 270_ohm and 3.3k .......
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Old 26th July 2006, 08:18 AM   #8
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Try this.
There is a better version that operates at +/-85V.

Shoog
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