Arjen's tube buffer for pre-amp

Josephjcole · 7th December 2009, 02:51 PM

Has anyone given these a try? I planning on ordering a couple sure tripath boards to try a Passive Line-Level Crossover with my speakers. I've always built integrated amps before but I'm thinking a separate preamp would be good. Maybe a passive preamp would be alright, but Arjen's buffer stage is fairly cheap and runs off of 12volts so it would be easy to power. I've searched around the forum and found lots of people saying they were going to order one, but one on mentioned actually listening to one. Anybody able to offer an opinion.?
Joe

redkid · 8th December 2009, 05:42 PM

I have purchased one but have not yet had time to hook it up and listen to it.

S.Spielbergo · 7th January 2010, 12:41 AM

I'm also interested in one of these tube pre amps, any feedback (pardon the pun) on these units?

S.Spielbergo · 9th January 2010, 02:00 PM

C'mon redkid, is it that bad!? Over in the tube forum there generally isn't much love for low voltage tube applications because of the distortion but it looks as though the B+ of 12v is stepped up to ~ 43volts on board which should be much more useful.

redkid · 10th January 2010, 04:03 PM

Sorry,,I still have yet to hook it up and try it out. As soon as I get to it I will give it a listen and I am hoping that it sounds good!

robygom · 14th January 2010, 10:47 PM

I'm interested in opinions too, please let us know as soon as you have the chance to try it! (maybe with a different ECC82, the original chinese tube is bad)

Anyone has the scheme of the tube buffer?

Ipanema · 16th January 2010, 01:38 PM

The board has a NE555. How does it work as a booster?

Bone · 08:34 PM

The 555 is configured as an oscillator and the output fed to a "Cockroft-Walton voltage multiplier.
See < Voltage multipliers : DIODES AND RECTIFIERS > for an explanation. I think about 8 stages are used. Does anyone know what frequency the 555 is running at?

Tony

robygom · 17th January 2010, 02:41 PM

Quote:

Originally Posted by Bone

The 555 is configured as an oscillator and the output fed to a "Cockroft-Walton voltage multiplier.
See < Voltage multipliers : DIODES AND RECTIFIERS > for an explanation. I think about 8 stages are used. Does anyone know what frequency the 555 is running at?

Tony

i wouldn't bet on it but the Cond is a 103J100, the two resistor are 1.6 Kohm so it SHOULD work with a frequency of 30 Khz. I only see the top side of the PCB so i hope i picked the right resistors!

tubesteve · 18th January 2010, 12:40 PM

works somewhat around 40KHz depending a bit on tolerances of R/C connected

7th December 2009, 02:51 PM	#1
Josephjcole diyAudio Member Join Date: Jun 2004 Location: Wisconsin	Arjen's tube buffer for pre-amp Has anyone given these a try? I planning on ordering a couple sure tripath boards to try a Passive Line-Level Crossover with my speakers. I've always built integrated amps before but I'm thinking a separate preamp would be good. Maybe a passive preamp would be alright, but Arjen's buffer stage is fairly cheap and runs off of 12volts so it would be easy to power. I've searched around the forum and found lots of people saying they were going to order one, but one on mentioned actually listening to one. Anybody able to offer an opinion.? Joe

16th January 2010, 08:31 PM	#8
Bone diyAudio Member Join Date: Jun 2004 Location: Dorset, UK	The 555 is configured as an oscillator and the output fed to a "Cockroft-Walton voltage multiplier. See < Voltage multipliers : DIODES AND RECTIFIERS > for an explanation. I think about 8 stages are used. Does anyone know what frequency the 555 is running at? Tony Last edited by Bone; 16th January 2010 at 08:34 PM.

18th January 2010, 12:40 PM	#10
tubesteve diyAudio Member Join Date: May 2009 Location: since 1998 in China as an electronic consulting design and testing engineer	ne555 works somewhat around 40KHz depending a bit on tolerances of R/C connected

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8th December 2009, 05:42 PM	#2
redkid diyAudio Member Join Date: Jan 2009	I have purchased one but have not yet had time to hook it up and listen to it.

7th January 2010, 12:41 AM	#3
S.Spielbergo diyAudio Member Join Date: Jul 2007	I'm also interested in one of these tube pre amps, any feedback (pardon the pun) on these units?

9th January 2010, 02:00 PM	#4
S.Spielbergo diyAudio Member Join Date: Jul 2007	C'mon redkid, is it that bad!? Over in the tube forum there generally isn't much love for low voltage tube applications because of the distortion but it looks as though the B+ of 12v is stepped up to ~ 43volts on board which should be much more useful.

10th January 2010, 04:03 PM	#5
redkid diyAudio Member Join Date: Jan 2009	Sorry,,I still have yet to hook it up and try it out. As soon as I get to it I will give it a listen and I am hoping that it sounds good!

14th January 2010, 10:47 PM	#6
robygom diyAudio Member Join Date: Nov 2009	I'm interested in opinions too, please let us know as soon as you have the chance to try it! (maybe with a different ECC82, the original chinese tube is bad) Anyone has the scheme of the tube buffer?

16th January 2010, 01:38 PM	#7
Ipanema diyAudio Member Join Date: Jun 2004 Location: KL	The board has a NE555. How does it work as a booster?

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