Aikido 9 pin board values
re: the resistors marked as 300E & 430E on the aikido B9A boards ... is this value regarded as definitive if building up the board using the valves specified? ie: 6N1P & 5687. ... these r not common values & there's not much room to be using resistors in series. Wouls 470 & 330 be close enuff/ ... anyone experimented here?
cheers .... cb
re: the resistors marked as 300E & 430E on the aikido B9A boards ... is this value regarded as definitive if building up the board using the valves specified? ie: 6N1P & 5687. ... these r not common values & there's not much room to be using resistors in series. Wouls 470 & 330 be close enuff/ ... anyone experimented here?
cheers .... cb
Aikido board parts
.... and one further B9A aikido board question .... does anyone have a source within australia for the 25kadjust pot - RV2 .. again this doesnt appear to be a standard value.
cheers .... cb
.... and one further B9A aikido board question .... does anyone have a source within australia for the 25kadjust pot - RV2 .. again this doesnt appear to be a standard value.
cheers .... cb
Ofcourse you may drop in. Do you have experience with building tube /valve amplifiers? Then you probably know which tubes you like...and the next step it to choose the board that will fit those tubes. You have a lot of choice these days. You could choose John Broskie's PCB's or ours. If you are interested in our boards. Just send me an email.
Octal boards.
Hello Bas,
The boards have arrived.Excellent quality and smaller than I imagined which will make for a better install.I'm grateful to you for the time and effort you have given us all.It may be a while before I get the project finished due to my hectic work schedule but I'll keep you posted with my progress.
Regards, Si.
Hello Bas,
The boards have arrived.Excellent quality and smaller than I imagined which will make for a better install.I'm grateful to you for the time and effort you have given us all.It may be a while before I get the project finished due to my hectic work schedule but I'll keep you posted with my progress.
Regards, Si.
Hi Bas,
The boards have arrived in perfect shape - thanks!
When do you start making the Loctal version? 😉
The boards have arrived in perfect shape - thanks!
When do you start making the Loctal version? 😉
Aikido PSU V 1.0
Hi Bas.I'm starting with the power supply first and I have a couple of questions.I need a B+ of 300V so can you suggest a ballpark figure for C1. I assume that the 250V secondary winding shown on the schematic is ok for a B+ of 300V. As I'm using one psu board per octal board can I omit R2/C4 from each board or would you leave them in. With regard to the heater bias, I'm using 6SN7's and I believe the maximum voltage difference between cathode and heater is 200V.Can you suggest values for R4/R5 that will give the required bias. Finally the heater bias take off point on the diagram goes to the centre tap of the secondary winding for the heater filaments, and I'm going to leave the heaters running ac.The 6X5 will have it's own heater winding and doesn't need biasing.Does that sound ok?
Cheers Bas, Si.
Hi Bas.I'm starting with the power supply first and I have a couple of questions.I need a B+ of 300V so can you suggest a ballpark figure for C1. I assume that the 250V secondary winding shown on the schematic is ok for a B+ of 300V. As I'm using one psu board per octal board can I omit R2/C4 from each board or would you leave them in. With regard to the heater bias, I'm using 6SN7's and I believe the maximum voltage difference between cathode and heater is 200V.Can you suggest values for R4/R5 that will give the required bias. Finally the heater bias take off point on the diagram goes to the centre tap of the secondary winding for the heater filaments, and I'm going to leave the heaters running ac.The 6X5 will have it's own heater winding and doesn't need biasing.Does that sound ok?
Cheers Bas, Si.
6DJ8 & 5687 Heat Connection for 6v ?
Hi Diyer,
I am using 6DJ8 & 5687 for Aikido Preamp. The heat filament is using 6V.
Is there anyone can tell how to connect 6V to the heat filament to 6DJ8 & 5687? (pin layout)
Thank you very much
Hi Diyer,
I am using 6DJ8 & 5687 for Aikido Preamp. The heat filament is using 6V.
Is there anyone can tell how to connect 6V to the heat filament to 6DJ8 & 5687? (pin layout)
Thank you very much
The 6dj8 is one wire goes to 4 and one wire goes to 5
For the 5687 ...connect pin 4 and 5 to each other and take one wire there...the other to pin 8
Here is a great program that you can use
http://tdsl.duncanamps.com/
For the 5687 ...connect pin 4 and 5 to each other and take one wire there...the other to pin 8
Here is a great program that you can use
http://tdsl.duncanamps.com/
5687 Heat Connection for 6v ?
Hi Bas,
For 5687 - 6v heat filament,
do you mean join Pin 4 & Pin 5 together and connect one heat wire to Pin 4 & 5.
another heat wire to Pin 8?
Thank you for your assistance
Hi Bas,
For 5687 - 6v heat filament,
do you mean join Pin 4 & Pin 5 together and connect one heat wire to Pin 4 & 5.
another heat wire to Pin 8?
Thank you for your assistance
build guide?
where is the aikido "building guide" that Bas posted previously (a pdf that was put up long time ago?) I downloaded it but can no longer find it.
where is the aikido "building guide" that Bas posted previously (a pdf that was put up long time ago?) I downloaded it but can no longer find it.
Another Aikido hits the tracks.
Hi Bas--just to report successful building of an Aikido with your boards. I used ECC85's and ECC88's as their fil draw was all my PS could allow. Bigger PS next step! Really want to use 6CG7/5687. [ECC85 gives a bit much gain for a line stage.]
But using cathode R's as per board, with well filtered 275V B+, I plugged in some ordinary tubes and away it went, first time. Great on the bench--1dB down at 65khz, 3dB down at 360khz(?), flat to DC, almost! Good square waves etc delivers over 40V, goes pearshaped about 45V. DC fils means no hum.....
But the sound! Amazing improvements all round--even bass seems better articulated; this is replacing the Conrad Johnson PV8 line stage--no slug as a pre. Transparency is what it's all about.
My grateful thanks again, to you, Bas.
Regards,
Ken.
Hi Bas--just to report successful building of an Aikido with your boards. I used ECC85's and ECC88's as their fil draw was all my PS could allow. Bigger PS next step! Really want to use 6CG7/5687. [ECC85 gives a bit much gain for a line stage.]
But using cathode R's as per board, with well filtered 275V B+, I plugged in some ordinary tubes and away it went, first time. Great on the bench--1dB down at 65khz, 3dB down at 360khz(?), flat to DC, almost! Good square waves etc delivers over 40V, goes pearshaped about 45V. DC fils means no hum.....
But the sound! Amazing improvements all round--even bass seems better articulated; this is replacing the Conrad Johnson PV8 line stage--no slug as a pre. Transparency is what it's all about.
My grateful thanks again, to you, Bas.
Regards,
Ken.
It is not finished yet...ask me whatever you would like to be put in there and I'll finish it.
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Bas Horneman said:
It is not finished yet...ask me whatever you would like to be put in there and I'll finish it.
Thanks, there were some threads about the power supply and how to make it; perhaps these could be added; and then the rest of the assembly?
Its really well written but just when I am getting into the story it ends! I don't want mine to end there!
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