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Old 23rd November 2012, 09:30 AM   #1
Gost22 is offline Gost22  Bolivia
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Question The Best tube/valve sound!?

Hi all!
What is the best tube/valve for preamp or line-stage i.e. that gives the best sound?
Is this a good schematics?
Why are the (1/2-6DJ8 + 1/2-6DJ8) tube/valve in this configuration (schematics) connected in parallel?
(1/2-6DJ8) + (1/2-6DJ8) in paralle.
It can be replaced 6DJ8(6922) with PCC88 and who changes that are needed in the schematics?
thank you!
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Last edited by Gost22; 23rd November 2012 at 09:53 AM.
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Old 23rd November 2012, 09:38 AM   #2
AJT is offline AJT  Philippines
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define "best".....
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Old 23rd November 2012, 09:58 AM   #3
Gost22 is offline Gost22  Bolivia
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Quote:
Originally Posted by Tony View Post
define "best".....
Hi Tony!
Give an opinion on this schematic or a suggestion for pain tube/valve preamplifier, line-stage or buffer.
thank you!
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Old 23rd November 2012, 09:59 AM   #4
DF96 is online now DF96  England
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That was going to be my question too!

The circuit looks like a good example of how not to do a line stage. For example, choose a valve with a low output impedance then put it into a circuit which increases it dramatically.
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Old 23rd November 2012, 10:25 AM   #5
AJT is offline AJT  Philippines
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Quote:
Originally Posted by Gost22 View Post
Hi Tony!
Give an opinion on this schematic or a suggestion for pain tube/valve preamplifier, line-stage or buffer.
thank you!
what is best for me may not be best for you, we are not the same person...

a Broskie CCDA works fine for me, i can hear no difference between it and the Aikido, both Broskie's....

the scheme shown below has a B+ of about 130volts, you can replace the diodes in the cathode of the input tube with 82 ohm resistors...
tube can be ECC88, 6922, 6dj8, etc...

Click the image to open in full size.
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Old 23rd November 2012, 11:02 AM   #6
tinitus is offline tinitus  Europe
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wow, a working curcuit looks 'appealing'
why the 1K5 att input pot ?
how can you use such small one ?
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Old 23rd November 2012, 11:14 AM   #7
DF96 is online now DF96  England
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What is the purpose of the common-mode choke L1? It appears to be in the wrong place to attenuate rectifier spikes, and it will have little effect on smoothing.
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Old 23rd November 2012, 11:25 AM   #8
tinitus is offline tinitus  Europe
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don't know, but is it good to have a choke in the grounding line ?
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Old 23rd November 2012, 11:47 AM   #9
SY is offline SY  United States
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I want to know why the OP keeps opening thread after thread asking the same question.
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Old 23rd November 2012, 12:04 PM   #10
DF96 is online now DF96  England
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Perhaps he doesn't like the answers he gets, so like a politician keeps asking the same question again and again hoping for a different result. Or maybe he has poor memory?
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