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Old 30th September 2010, 11:01 PM   #31
nige838 is offline nige838  United States
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Thank you for finding the datasheet...

I'm going to tie the left out into the right in, bridging the amp for mono so that i can use it as a guitar preamp...

I still plan on bypassing the step up and just using 110v. for the plates from a cheap DC-AC inverter...
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Old 1st October 2010, 05:23 PM   #32
nige838 is offline nige838  United States
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So, I just got done putting my 3rd one together and I used the bridge idea...doesn't work. I think that it's oscillating. Tonight I'll take it back down and undo the bridge and see if I can't get something better out of it..

-Nick
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Old 18th October 2010, 10:32 PM   #33
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Hi, I'm totally new to tubes... I'm interested in modding this pcb so I hope this thread will grow up.
Today I've connected the buffer to a Ta2024 Helder amp, I had a nice feeling after a couple of hours of burn in.
I've noticed some hum particularly while touching the pot, maybe it will disappear when in a metal case with proper grounding.
The 7805 regulator runs terribly hot... I'm planning to desolder it and screw it with some thermal grease on the metal case.
Tonight I bought a Jan 5670 GE tube on eBay.
Also I wonder if different diodes and better resistors could give some improvement.

Last edited by Calamaro; 18th October 2010 at 10:36 PM.
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Old 19th October 2010, 12:06 AM   #34
nige838 is offline nige838  United States
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I don't think so. If you examine the schematic, you'll notice that there is a gain of.....wait for it......ZERO. THis is a cathode follower and doesn't produce any gain what so ever. I found that you absolutely have to use a transformer, not a wall-wart. The heaters need to run on AC power, not DC...Plus it does go up after you rectify it...

I turned this into a guitar "pre"amp. It distorts nicely, and doesnt interfere with anything else. I'm currently building a true tube amplifier, the AA4 (or All American 4)...

Peace,
Nicholas
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Old 19th October 2010, 04:28 PM   #35
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Hi Nicholas, zero gain do it means that it's a buffer and not a preamp? My purpose here is to improve detail and soundstage and to have a more analogic/tubee sound.

Someone recommends Schottky diodes in a heater PSU, it seems that 1N4007s switching noise get into the music.

I'm planning to use a toroidal transformer (12v - 150VA) for both the buffer and the TA2024 amp (the latter after rectification).

Last edited by Calamaro; 19th October 2010 at 04:39 PM.
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Old 19th October 2010, 07:01 PM   #36
nige838 is offline nige838  United States
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Yhea, the one that I had was just a buffer. I think that if you run it off of that transformer, you'll be fine, just be sure that you have a good filter before you give that power to the TA2020...

Peace,
Nicholas
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Old 19th October 2010, 09:36 PM   #37
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Can I take off buffer output capacitors as I have TA2024 amp input capacitors?
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Old 20th October 2010, 02:32 AM   #38
nige838 is offline nige838  United States
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I'm not sure, as I don't have the circuit handy...I would think that it would be ok though...

I really like Mr. Helder's wares, espically his TA2024, it doesn't get any cheaper for a HiFi system...

Peace,
Nicholas
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Old 20th October 2010, 06:54 AM   #39
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Keep in mind that the voltages are much higher in tube gear, so if there is a DC component on the output and you remove the capacitor it has the potential to destroy your amplifier real quick-like.

Always measure first.
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Old 28th November 2010, 07:06 AM   #40
nige838 is offline nige838  United States
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Any chance anybody could tell me if it would be hard to convert this to a Class A SE Amplifier?

Thanks,
Nicholas
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