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Old 20th March 2017, 10:52 PM   #1
tubo is offline tubo  Philippines
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Default 6n16b buffer on a nakamichi cdp

hello guys,

i just got a nice condition nakmichi cd player 3. i would like to put a 6n16b buffer from this site: Mao Audiophile Modifications: Nakamichi CD Player 3 Lampized with 6n16b tube

my question is about the C1 capacitor which is 100uf on the attached schematic. is that a typo? i tried asking the author but with no response.

thanks
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Old 21st March 2017, 01:33 AM   #2
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Sure. 100nf is enough. 56k resistor is bootstrapped. 100nf / 1 Mega Ohm is good.
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Old 21st March 2017, 01:41 AM   #3
tubo is offline tubo  Philippines
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Thank you very much wavebourn...i very much appreciate your response. Will order parts for it now...

Thanks again
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Old 21st March 2017, 03:55 AM   #4
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Also, no reason for 56k2 resistor. You can use 470k there.
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Old 21st March 2017, 10:20 AM   #5
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by Wavebourn View Post
Also, no reason for 56k2 resistor. You can use 470k there.
And also no reason for Rload
Come to think about it, no reason for the hole circ(us)uit
Mona
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Old 21st March 2017, 10:26 AM   #6
DF96 is offline DF96  England
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Quote:
Originally Posted by Ketje
Come to think about it, no reason for the hole circ(us)uit
My thought, too. Adding this circuit adds a little noise, hum and distortion and probably raises output impedance (so it may be an anti-buffer).
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Old 21st March 2017, 10:28 AM   #7
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Quote:
Originally Posted by Ketje View Post
And also no reason for Rload
Come to think about it, no reason for the hole circ(us)uit
Mona
The reason for "rload" is to discharge the cap, i.e. a bleeder actually. I would use all 3 resistors: on input, output, and grid leak of the same value, like 220k, to save money.
The reason for the circuit is, the majority of modern designers think of "voltage amplification" forgetting about power transfer. As the result, input/output impedances are non-linear, so a tube buffer "mismatch" them pretty well isolating power-wise from each other.
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Old 21st March 2017, 10:37 AM   #8
DF96 is offline DF96  England
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C4 should be omitted. Adding a capacitive load to a follower can cause instability.

Nonlinearity of impedances may not matter if they are large/small enough (as appropriate). A cathode follower is likely to have an output impedance which is higher and less linear than a correctly designed opamp circuit.
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Old 21st March 2017, 10:38 AM   #9
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by Wavebourn View Post
The reason for "rload" is to discharge the cap, i.e. a bleeder actually. I would use all 3 resistors: on input, output, and grid leak of the same value, like 220k, to save money.
The reason for the circuit is, the majority of modern designers think of "voltage amplification" forgetting about power transfer. As the result, input/output impedances are non-linear, so a tube buffer "mismatch" them pretty well isolating power-wise from each other.
As i understand it the thing has to be mounted inside the cabinet, the caps will discharge on the ins and outs.
If you lik to "isolate power-wise", put a j-fet in between
Mona
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Old 21st March 2017, 10:43 AM   #10
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Originally Posted by Ketje View Post
If you lik to "isolate power-wise", put a j-fet in between
Yes, one more option.

Why are you so strict in respect to people who are starting their DIY activity?
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Last edited by Wavebourn; 21st March 2017 at 10:46 AM.
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