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Old 2nd January 2006, 04:19 AM   #1
amp_guy is offline amp_guy  United States
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Default 6BQ5\EL84 line amp

with all this interest in using unusual tubes for line stages, 12B4's
6C45's and so forth I was wondering if anyone hadany thoughts on using
6BQ5 or 6V6 in triode mode. they should be able to drive most any power amp.

Idid find a line amp using an 6AQ5 in an srpp online at

http://audiotropic.netfirms.com/proj...inepre6AQ5.gif

but I have a bunch of 6BQ5 laying around.
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Old 2nd January 2006, 06:27 AM   #2
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404 on the link
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Old 2nd January 2006, 03:28 PM   #3
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http://audiotropic.netfirms.com/Proj...inePre6AQ5.gif
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Old 3rd January 2006, 02:49 PM   #4
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Default Re: 6BQ5\EL84 line amp

Hello,

the EL84 makes for a great preamp tube but it needn't be SRPP.

You can use a normal anode follower configuration with a nice wirewound plate resistor (like a Mills) of around 7500 ohm (use two 15K in parallel) running at 30-35 mA to give very low distortion and an output impedance of around 1500 ohms.

Alternatively and even better still you can use a special output transformer like the Sowter 9040: http://www.sowter.co.uk/specs/9040.htm which is perfect for the job and gives you an ouput impedance well below 600 ohms.

Both options are sonically and especially musically far superior to the SRPP configuration.

Best regards
Michael
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Old 3rd January 2006, 08:19 PM   #5
amp_guy is offline amp_guy  United States
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Hey thanks for the encouragement michael.
what you described is very close to what I figured up.
I cosidered using some iron but For now I think Ill build it up.
on the cheap.


regards Dave
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Old 3rd February 2010, 06:26 PM   #6
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Quote:
Originally Posted by leadbelly View Post
I wonder why he uses different kathode resistors (82 and 100 Ohm) in a SRPP.
I like the idea though..
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