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Old 25th June 2009, 03:55 AM   #1
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Default About an hybrid LM3886 amp using 12AX7 tube

Hello

Here is an hybrid LM3886 inspired by an ideas from the Tube Cad web site.

Which value would you suggest for the two RK resistors ?

Any suggestions or modifications ?

I include the schematics.

Thank you

Regard
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Old 25th June 2009, 05:46 AM   #2
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I'm using something like this- sounds very clear!


tube is ECC88 ?or you can see it:
http://cgi.ebay.com/E88CC-6DJ8-6N23P...3A1%7C294%3A50
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File Type: jpg mainn amp schematics.jpg (70.6 KB, 1554 views)
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Old 25th June 2009, 09:37 PM   #3
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Hello

Nice schematic your 6N23P hybrid amp.

I have lot of new old stock 6N2P-EV tube from Russia, same than 12AX7 but with a different filament connexion.

So I would like to use my 6N2P-EV in a hybrid LM3886 amp.

Do my schematic are good ?

But I would need suggestion of values for RK resistors.


Thank

Bye

Gaetan
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Old 26th June 2009, 05:26 AM   #4
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the amp is very goood !(about my schematics ,you can try it)

as i know 12ax7 and 6n23p have different characteristics and not only the filament conection is not like in 6N23P
your schematics is good too but is beter if you use 4,7u cap as input capacitor

this is my pcb for my amp
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Old 26th June 2009, 02:18 PM   #5
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Hi guys, which ps you use for this ampli.
Bye
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Old 26th June 2009, 10:35 PM   #6
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Hello

Looking at the spec of the 6n2p-ev, maby (in my schematic) 90 volt of anode voltage are a bit low ?

http://www.drtube.com/datasheets/6n2p-ev.pdf


Thank

Bye

Gaetan
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Old 27th June 2009, 08:07 AM   #7
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no, it's not too low.
i'm using it at 45 volts and everything is OK(see me scematics)
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Old 28th June 2009, 12:12 PM   #8
piero7 is offline piero7  Italy
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Quote:
Originally posted by jazzman06
the amp is very goood !(about my schematics ,you can try it)

as i know 12ax7 and 6n23p have different characteristics and not only the filament conection is not like in 6N23P
your schematics is good too but is beter if you use 4,7u cap as input capacitor

this is my pcb for my amp

Very interesting pcb, show us also the psu please
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Old 28th June 2009, 03:25 PM   #9
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there is the schematics
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File Type: jpg psu.jpg (27.4 KB, 1147 views)
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Old 28th June 2009, 03:32 PM   #10
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psu pcb
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File Type: jpg psu 1.jpg (22.2 KB, 1033 views)
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