Tube Buffer for gain clone.

huangyong · 22nd December 2004, 04:28 AM

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.

Franz G · 22nd December 2004, 07:12 AM

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

huangyong · 23rd December 2004, 01:27 AM

i got this from a CHinese website and they claim that is MF X10-D tube buffer schematic.

chipco3434 · 23rd December 2004, 02:14 AM

Quote:

this is an preamp, not a buffer!

Nuub question...

What's the difference?

digi01 · 23rd December 2004, 02:34 AM

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).

joensd · 23rd December 2004, 11:18 AM

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).

I´m 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?

wim · 23rd December 2004, 02:33 PM

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).

Franz G · 23rd December 2004, 02:38 PM

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

wim · 23rd December 2004, 02:42 PM

Thanks for your quick reaction Franz. Thats a clear explanation.

digi01 · 23rd December 2004, 11:16 PM

Quote:

Originally posted by joensd
I´m 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

22nd December 2004, 04:28 AM	#1
huangyong diyAudio Member Join Date: Sep 2003 Location: Singapore	Tube Buffer for gain clone. 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.

23rd December 2004, 02:33 PM	#7
wim diyAudio Member Join Date: Sep 2003 Location: Nootdorp, Netherlands	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). __________________ Als er "X" artikelen benodigd zijn, blijken er "X" - 1 in voorraad te zijn.

23rd December 2004, 02:42 PM	#9
wim diyAudio Member Join Date: Sep 2003 Location: Nootdorp, Netherlands	Thanks for your quick reaction Franz. Thats a clear explanation. __________________ Als er "X" artikelen benodigd zijn, blijken er "X" - 1 in voorraad te zijn.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Inv Gain Clone with on board PSU	anbello	Chip Amps	65	7th May 2008 01:32 PM
Adding gain to this buffer....	theAnonymous1	Chip Amps	12	3rd August 2007 05:17 PM
Unity Gain Tube Buffer	AKSA	Tubes / Valves	41	2nd January 2004 10:11 AM
What is a Gain Clone exactly?	Lars Clausen	Chip Amps	33	26th November 2003 05:33 PM
Opamp + buffer, how to bypass buffer at HF for unity gain?	Christer	Solid State	10	29th October 2003 06:50 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

22nd December 2004, 07:12 AM	#2
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	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

23rd December 2004, 01:27 AM	#3
huangyong diyAudio Member Join Date: Sep 2003 Location: Singapore	i got this from a CHinese website and they claim that is MF X10-D tube buffer schematic.

23rd December 2004, 02:34 AM	#5
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	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).

23rd December 2004, 02:38 PM	#8
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	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

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read