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Old 1st July 2007, 02:39 AM   #1
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Default 24V Aikido --> 6GM8 with Buffer

I'm going to build this as a first tube project:

http://www.tubecad.com/2006/06/blog0067.htm

See the BUF634 section.

So far, I haven't come across anyone who has built this schematic yet.

Question is, do I just build the entire amp as per:

http://www.tubecad.com/2006/04/blog0059.htm

And then add the buffer section?

Or can I ignore the orginal 6GM8 pre amp schematic altogether? It seems like a lot of capacitors, etc, will be missing if it's built as per the schematic with the buffer.

Cheers for any tips.
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Old 1st July 2007, 09:35 AM   #2
MRupp is offline MRupp  Germany
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Well, the output caps from the standard Aikido have been moved behind the buffer stage, other than that I do not see a major difference. The "standard" schematics has caps from the tube's internal shielding to ground , they were omitted in the buffered version, I believe, to simplify the diagram and show the fundamental circuit. So build the buffered version and consider including the caps for the shielding.
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Old 1st July 2007, 10:54 AM   #3
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Okay that makes a little more sense.

As far as I can tell;

R1 on buffer schematic = R7 on the original 6GM8 preamp schematic
R2 " = R12 "

But just above R1 on the buffer schematic, there's a capacitor which isn't on the Aikido board.

How would I wire this into the circuit?
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Old 1st July 2007, 11:20 AM   #4
MRupp is offline MRupp  Germany
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Quote:
R1 on buffer schematic = R7 on the original 6GM8 preamp schematic
No, look again! And better still, read thru the wole set of articles and try to understand in more detail how the Aikido works.
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Old 1st July 2007, 11:55 AM   #5
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hahah back to the drawing board I think -- time to understand first how my electric toothbrush works......
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Old 3rd July 2007, 08:07 AM   #6
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Is there any particular reason Broskie recommends *only* using the T0-220 package (ie. BUF634T)?
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Old 4th July 2007, 08:52 AM   #7
MRupp is offline MRupp  Germany
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Do you mean this sentence "Be sure to get the TO-220 package and put a good heatsink on it." ???
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Old 4th July 2007, 10:39 AM   #8
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Yeah - I've noticed that particular BUF634 is very rare. Also, a lot of posts on this buffer find people not using heatsinks at all.

ie. one could probably use any BUF634 (P,U,T) without a heatsink?
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Old 4th July 2007, 12:03 PM   #9
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Depends whether you really bias it into class A as indicated and on how much power your headhpone will need but I would say it is a risk not to use the T0220 version with heatsinks.
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Old 4th July 2007, 12:07 PM   #10
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Cheers mate!
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