• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Poll..anyone interested in an Aikido linestage PCB group buy?

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#121
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.
 
#123
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.
 
#125
Bas Horneman said:
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.
Click to expand...

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
 
#126
:cop: Compromised URL removed by Moderation

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
Click to expand...


[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
Click to expand...

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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#133
Not bad. Is that the final board layout ?
Click to expand...

I'm not sure. ... our member bonny_kjs mailed me to say that he was having some made....probably got sick and tired of our discussions..a man of action! 😉

For instance I would have liked very small little tracks for the second tube filament...under the socket..about as long as the first one but then leading to the inside of the socket, not the outside....
 
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