Hi guys!
I made this ACF (John Broskie's) with valve/tube 12au7 under this schematic (circuit), but the ACF is not gonna work?! 😕😀
There is a ton of buzz.🙁
Please tell me what could be the problem?🙁
Thanks for your help!
I made this ACF (John Broskie's) with valve/tube 12au7 under this schematic (circuit), but the ACF is not gonna work?! 😕😀
There is a ton of buzz.🙁
Please tell me what could be the problem?🙁
Thanks for your help!
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I would guess you have a cold solder joint. Also, I don't think you need the 510 resistors in the heater bias, just attach it to one side of the heater.
Hi,
Are you sure you need this?
Where do I connect GND=??🙁
thank you!
Are you sure you need this?
Where do I connect GND=??🙁
thank you!
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Do you have 125V B+ and -125V B+ (same?)?
What is bottom resistor under 180k? Should be bigger than 180k, I think...
What is bottom resistor under 180k? Should be bigger than 180k, I think...
The 180 k and 47 k makes a voltage divider for filaments. From 160 volts it puts heaters on 33 volt potential
With 10mA of plate current those 6.8K resistors really need to be 3.3K to get the voltages listed in the schematic. It seems needlessly complicated for what it is doing, and I wouldn't DC couple it to anything as you can't guarantee the output will be close to ground potential.
I think there is a fundamental flaw in the design relating to the floating supplies.
Your proposal on the filament supply is fine.
Are you doing two for stereo?
I think there is a fundamental flaw in the design relating to the floating supplies.
Your proposal on the filament supply is fine.
Are you doing two for stereo?
Your proposal on the filament supply is fine??😕
I think there is a fundamental flaw in the design😕😀
Is the cathode resistor 470R is OK? for 10mA of plate current.
What should be the design?
Thanks!
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Without knowing you have taken a conceptual discussion schematic from glassware and tries to implement it. Conceptual schematics takes some working usually irl.
Neither is it an aikido follower. Nor a white follower. Some direct coupled experimental discussion schematic I would say. You cant trust dc output.
Neither is it an aikido follower. Nor a white follower. Some direct coupled experimental discussion schematic I would say. You cant trust dc output.
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See ACF-2 with tube 12au7.
http://www.tubecad.com/2012/02/07/ACF-2 9-Pin.pdf
http://www.tubecad.com/2012/02/07/ACF-2 9-Pin.pdf
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