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Old 22nd December 2004, 04:28 AM   #1
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Default Tube Buffer for gain clone.

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Can i use this buffer for my gainclone?
my plan is to remove all the power supply section, and feed in +/-24V or +/-30V. any amendment that i should make?

Thanks.
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Old 22nd December 2004, 07:12 AM   #2
Franz G is offline Franz G  Switzerland
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Not very suitable for a gainclone:

this is an preamp, not a buffer!

This amp is working with some gain eg. voltage amplifier.

The input and output impedances are too high, for todays use.

And: there is a frequency dependent feedback in this circuit (including an electrolytic :-( notabene in the signal path). Maybe it is a phono preamp?

Franz
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Old 23rd December 2004, 01:27 AM   #3
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i got this from a CHinese website and they claim that is MF X10-D tube buffer schematic.
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Old 23rd December 2004, 02:14 AM   #4
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Quote:
this is an preamp, not a buffer!
Nuub question...

What's the difference?
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Old 23rd December 2004, 02:34 AM   #5
digi01 is offline digi01  China
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Simple understanding, the buffer is unity gain or small gain.
the pre-amp has certain gain and the level of output is adjustable,+0dB max. or +4dB max(such as mixer console).
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Old 23rd December 2004, 11:18 AM   #6
joensd is offline joensd  Germany
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Quote:
Simple understanding, the buffer is unity gain or small gain.
A buffer has unity gain or slightly less.

Quote:
+0dB max. or +4dB max(such as mixer console).
Im not sure what you mean but a preamp with 0dB gain is a buffer
and 4dB a rather low gain that is quite uncommon in preamps.
Maybe you are thinking about vu-meters and reference input line level signals?
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Old 23rd December 2004, 02:33 PM   #7
wim is offline wim  Netherlands
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Like chipco 3434, the exact difference between a buffer and a pre-amp is unknown by me. They both are amplifiers i.m.o.?

Can anyone clearly tell the difference between buffer and pre, in simple words (becouse i am Duch).
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Old 23rd December 2004, 02:38 PM   #8
Franz G is offline Franz G  Switzerland
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The purpose of a buffer is impedance matching, not amplification.

Gain of a buffer is normally = 1, so no amplification, the input signal is not smaller than the output signal.

A preamp does some amplification (gain >1), the output signal is stronger than the input.

Franz
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Old 23rd December 2004, 02:42 PM   #9
wim is offline wim  Netherlands
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Thanks for your quick reaction Franz. Thats a clear explanation.
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Old 23rd December 2004, 11:16 PM   #10
digi01 is offline digi01  China
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Quote:
Originally posted by joensd
Im not sure what you mean but a preamp with 0dB gain is a buffer
and 4dB a rather low gain that is quite uncommon in preamps.
Maybe you are thinking about vu-meters and reference input line level signals?
Yes,I mean that 0dB/4dB is the reference voltage level.Franz's explanation is more clear

rgds
digi
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