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Old 4th December 2005, 01:28 PM   #1
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Default Need Help for Power Supply for gg Preamp

I am a new B in DIY tube amp.
I have built a gg pre amp with power supply using LCRCRC filter.
I use chok input instead of capacitor input to avoide too high a volatge come out from the rectifier with capacitor input (~330V @ no load which already cause me lost 1 out of 4 ziner diodes across the capacitor in the middle).
The power supply circuit is now as in the upper figure.
However, later I find that there is a critical minimum value for load current in chok input filter circuit. The load current in GG (about 8mA) seems to require a chok with at least 30H in my chok input filter circuit. If I do not replace my existing gears, can I rearrange my filtering circuit as in the lower figure. (i.e. RCLCRC? or even RCRCLC?)

Does it work and is there any drawback?

Thanks for helping me
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Old 4th December 2005, 01:31 PM   #2
Zen Mod is offline Zen Mod  Serbia
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just use appropriate shunt resistor on end of PS
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Old 4th December 2005, 02:55 PM   #3
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Thanks

It seems that the current have to be increased several times to meet the minimum current for the chok.
Will noise be introduced by adding this shunt resistant to the output of the PS to increase the current?

Thanks
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Old 4th December 2005, 05:29 PM   #4
poobah is offline poobah  United States
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go to www.duncanamps.com

They have have FREE power supply design/modeling program that is very well done.
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Old 5th December 2005, 12:10 PM   #5
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My power supply was originally based on "ducanamp", it told me nothing about critical inductance required for the chok I am using.
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Old 5th December 2005, 12:26 PM   #6
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Quote:
Originally posted by vangogh-hk
Thanks


Will noise be introduced by adding this shunt resistant to the output of the PS to increase the current?

Thanks

no.
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Old 6th December 2005, 11:01 AM   #7
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If I add a shunt resistant to the power supply circuit output to increase the current.

It seem that I have to change other resistors to higher rating due to higher current (several times) flow.

Could I rearrage the circuit to that in the lower part of the power circuit I shown above. (i.e. using resistor input instead of chok input).

Will that solve the problem?

Thanks
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Old 8th December 2005, 03:00 PM   #8
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