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Old 22nd June 2010, 04:31 PM   #1
Giorgos3924 is offline Giorgos3924  Greece
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Default preamplifier

I search schematic of tube preamplifier for this amplifier.
http://mycaramplifiers.com/wp-conten...-amplifier.jpg
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Old 22nd June 2010, 11:05 PM   #2
aardvarkash10 is offline aardvarkash10  New Zealand
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to supply the line or high level inputs? And in what application? Are you going to be using it in a vehicle and so require a robust 12VDC circuit, or some other location?
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Old 22nd June 2010, 11:29 PM   #3
Giorgos3924 is offline Giorgos3924  Greece
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to supply this amplifier
http://mycaramplifiers.com/wp-conten...-amplifier.jpg
Not for car.
i want with tubes.

This preamplifier is good?
http://diyaudioprojects.com/Tubes/12...1schematic.jpg
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Old 23rd June 2010, 12:12 AM   #4
aardvarkash10 is offline aardvarkash10  New Zealand
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what source are you using? CD? Phono?
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Old 23rd June 2010, 01:46 AM   #5
Gordy is offline Gordy  United Kingdom
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Quote:
Originally Posted by Giorgos3924 View Post
No, not so good. It has poorly chosen tubes, lots of feedback that is only there because of the poorly chosen tubes, multiple signal line capacitors, and high output impedance.

For a good line preamplifier consider the Aikido design from TubeCad:
John Broskie's Guide to Tube Circuit Analysis & Design
Aikido All in One
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Old 23rd June 2010, 02:15 AM   #6
Wavebourn is offline Wavebourn  United States
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Quote:
Originally Posted by Giorgos3924 View Post
Yes.
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Old 23rd June 2010, 03:59 AM   #7
aardvarkash10 is offline aardvarkash10  New Zealand
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well then. It seems not only economists have this problem!
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Old 23rd June 2010, 08:41 AM   #8
ray_moth is offline ray_moth  Indonesia
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I'm with Gordy on this.
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Old 23rd June 2010, 09:56 AM   #9
suntechnik is offline suntechnik  Russian Federation
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For preamp I would go either for 6DJ8 (6N1P, 6N30P) or EF806 (EF86)

The E80F preamp
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Old 23rd June 2010, 04:52 PM   #10
kevinkr is offline kevinkr  United States
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Originally Posted by ray_moth View Post
I'm with Gordy on this.

Me too.. Early on I designed a generally similar circuit and found it sonically inferior to just about anything you could imagine..

Still other options to those listed above could include a simple amplifier stage using half of an ECC99 or 5687 per channel for a gain of around 22dB or so and fairly low source impedance with no fdbk.
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