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Old 11th June 2011, 11:15 PM   #1
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Default ebay TA2022 amp board w/tube pre ..opinions?

Just spotted this but I'm a novice so if anyone has an opinion on it I would appreciate it- it's kind of what I've been looking for and looks good value. I can't see where the volume pot attaches tho

TA2022 Class T Power Amplifier W/ 6DJ8 6922 Tube Preamp | eBay UK

Will
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Old 12th June 2011, 12:04 AM   #2
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As a novice: Keep your fingers off or you might get killed!!!

-Tube units have hazardous life dangerous high voltages. Board design and assembly need to respect this and take special preparations.
On the photo it seems to me that they have just ignored all the rules you need to obey dealing with high voltages. THEY MIGHT WANT TO KILL YOU!!!

This should be enough but there is even more:
-You might get probs with the high voltage power supply needed for the tube.
Quote:
Power supply: AC 9V-0V *1 , AC 22V-0V-22V *1 /4.5A
This might not be right.
-Looking at the shape of the PCB there is no doubt that the whole unit was originally planned to be mounted together with a toroidal transformer into a case.
The unit is a left over or even has beeb sorted out by original producer with quality issues.

All of you: keep away!
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Old 12th June 2011, 01:01 AM   #3
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It might not be a high voltage supply to the tube.
On my class d /SRPP tube amp design I use +/- 45 volts on the tube.
Not quite in the deadly zone.
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Old 12th June 2011, 02:32 AM   #4
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Eek, fair enough Ampit, you are right. I guess this board is similar? 5670 TDA7294 Tube Hybird Integrated Amplifier Assembled | eBay UK

I can get a friend who's a qualified leccy to help me out but yes, I don't want to give myself a deadly shock.
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Old 12th June 2011, 03:39 AM   #5
mikemac is offline mikemac  Australia
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I'd be more concerned about the quality of what comes out the end then how dangerous it is. My first impression is why bother with a tube in the first place. Looks gimmicky
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Old 12th June 2011, 12:32 PM   #6
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Quote:
Originally Posted by mikemac View Post
I'd be more concerned about the quality of what comes out the end then how dangerous it is. My first impression is why bother with a tube in the first place. Looks gimmicky
True, I don't know if there are real sonic benefits with a tube buffer or not, maybe some gain advantage perhaps? I admit that I'm also wanting the aesthetic of a tube; I had an idea for a design for the case with the tube showing through at the front.
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