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Old 22nd March 2014, 07:50 PM   #1
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Default PSU for 6N6P

Hello,

I am developing a simple cathode follower with 6N6P tubes.

I would like to create a stable and low noise PSU for the anodics, which should supply about 70mA in total, with a not very high budget.

I designed a simple but functional schematic, do you think there something I could do better?
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Old 22nd March 2014, 08:42 PM   #2
maton00 is offline maton00  Mexico
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you could try lowering the HV with some 50 to 100 volts with a resistor and a Cap, before the regulating circuit.
It will also reduce the ripple = noise.
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Old 23rd March 2014, 01:20 AM   #3
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Hi,

Quote:
I would like to create a stable and low noise PSU for the anodics, which should supply about 70mA in total, with a not very high budget
Where does this 70mA come from?

Ciao,
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Old 23rd March 2014, 08:58 AM   #4
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Quote:
Originally Posted by maton00 View Post
you could try lowering the HV with some 50 to 100 volts with a resistor and a Cap, before the regulating circuit.
It will also reduce the ripple = noise.
Thanks Maton00 for the suggestion. I was actually thinking I could use a RL//C network before the regulator instead of a R//C, so I could lower down th HV and filter the ripple at the same time. I could dimension the wire I use to build the L, in order to get the 1KOhm series resistance I need to lower down the HW with 70V.
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Old 23rd March 2014, 09:03 AM   #5
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Originally Posted by fdegrove View Post
Hi,

Where does this 70mA come from?

Ciao,

Ciao Frank ,

70mA is a conservative evaluation of the load current.

I am planning to power up two tubes, each one biased at 20-22mA, so the total DC current should be 40-45mA.
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Old 23rd March 2014, 11:08 AM   #6
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If C2 in your schematic is really 1660 F, it is a total overkill.
After Q1 the ripple is already gone. Some 47...100 F would be quite sensible.
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Old 23rd March 2014, 08:26 PM   #7
maton00 is offline maton00  Mexico
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You could do something like this and it will also reduce a lot the ripple
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Old 23rd March 2014, 11:35 PM   #8
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Thank you a lot for your suggestion guys. I come from a decent experience into discrete-components electronic design but this is my first design of tube-related stuff so your suggestions are really precious!! Luckily we have massives electronic labs at work so I have the opportunity to try and compare more configurations

I will try the last circuit using a 4H inductor, then I'll post the measurements from the scope.
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Old 24th March 2014, 08:35 PM   #9
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...dont forget a low value resistor on the emitter..it may help..
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