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Old 25th July 2005, 11:59 PM   #121
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As I think of it I would also like to use seperate triodes for either the input or output. 417A or 5842 or 6C45Pi for inputs for a Phono stage. And 12B4A's instead of the 5687. Maybe triode 6BQ5's.

OR, to save cost, we use only the 9 pin variations which I'm guessing 80% - 90% of the DIY'ers would use.
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Old 26th July 2005, 12:02 AM   #122
agent.5 is offline agent.5  United States
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Quote:
Originally posted by Bas Horneman

Could you be more specific?

It is same as my rant above about using mother and daughter boards. Maybe grid resistors connect directly to the tube sockets. Maybe p2p cathode resistors as well.
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Old 26th July 2005, 12:18 AM   #123
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A pcb for the circuitry with pads for p2p sockets might work and be the best approach. Grid resistors could be mounted directly to the socket. Leave the filament connections for P2P? This also allows one to mount the socket in a "normal" manner on the chassis. Best flexibility so far.
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Old 26th July 2005, 02:49 AM   #124
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I think there are too many variations to use 2 pcb's connected by an edge connector. 9,7,octal or seperate triodes for input and/or output. Add in various pinouts.
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Old 26th July 2005, 03:08 AM   #125
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by Bas Horneman
The gnd bugs me as well...but I thought it's enough of a bus so that it might just work..but when thinking ground...apparently one has to think current...and both cathode resistors dump the current through the bottom part and has to go all the way past the input "all the way" too the gnd part up north. (Excuse my pseudo tech babble) Some kind of star earth would be nice.
You might get most of the way there by moving the ps ground connection to middle of the ground trace at the bottom of the board and have the signal ground connect at that same point.

Sheldon
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Old 26th July 2005, 08:32 AM   #126
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Click the image to open in full size.

Latest version. And remarks by Bonny_kjs


I have done two changes as suggested by "Sheldon" and " Agent 5".

>You might get most of the way there by moving the ps ground connection to middle of the >ground trace at the bottom of the board and have the signal ground connect at that same >point.
>Sheldon


>[1] 6.3V filament power. Can the power input pads be placed between the two tubes? >Put .the pads where J2 and J3 are and eliminate J2 and J3.
>agent.5

Another point by Agent5

2] If we do [1] above, we have to move R12 and C1 south of the tubes. This will eliminate the long trace underneath J2 and J3 and also the long trace on the right side of the board, connecting R10 and C1.

R12 is also connected to C2 and R8. The track has to go to these components also.

I can design and make available boards for LOCTAL and OCTAL tubes separately, instead of designing mother and daughter boards.

Double side board is 2.5 times the cost of single side boards. I can do double side board also.

BTW does someone know about any study as to which board is better for tube audio SS or DS? technically not cost wise ?

Regards

JP
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Old 26th July 2005, 08:05 PM   #127
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I think SS with one side left solid for a ground plane..
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Old 30th July 2005, 11:32 AM   #128
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Aikido beta pcb Click the image to open in full size.
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Old 30th July 2005, 11:35 AM   #129
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Do I see a few shorted tracks, esp. the top left area?
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Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
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Old 30th July 2005, 11:36 AM   #130
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based on this layout..
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File Type: pdf aikido13.pdf (39.8 KB, 343 views)
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