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Old 7th December 2009, 01:51 PM   #1
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Default 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
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Old 8th December 2009, 04:42 PM   #2
redkid is offline redkid  United States
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I have purchased one but have not yet had time to hook it up and listen to it.
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Old 6th January 2010, 11:41 PM   #3
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I'm also interested in one of these tube pre amps, any feedback (pardon the pun) on these units?
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Old 9th January 2010, 01:00 PM   #4
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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.
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Old 10th January 2010, 03:03 PM   #5
redkid is offline redkid  United States
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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!
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Old 14th January 2010, 09:47 PM   #6
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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?
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Old 16th January 2010, 12:38 PM   #7
Ipanema is offline Ipanema  Malaysia
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The board has a NE555. How does it work as a booster?
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Old 16th January 2010, 07:31 PM   #8
Bone is offline Bone  United Kingdom
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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 07:34 PM.
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Old 17th January 2010, 01:41 PM   #9
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Quote:
Originally Posted by Bone View Post
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!
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Old 18th January 2010, 11:40 AM   #10
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Default ne555

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