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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: update 5 posted by vinnie2 on September 14, 2016 at 05:19:02:
A DC filament supply filter that is cap input will have some nasty looking ripple that sometimes can be heard even if the ripple level is low.A choke input supply filter for the DC filament supply will have only sine wave ripple that is not as easily heard.
Because the current draw is high and the voltage is low the needed Henry value of the input choke is low and won't break the bank.
Calculation for critical inductance Henry value for a input choke.
((voltage/current in amps) + DCR of choke) / 1000 = choke value in Henry
For my 300b I use the CH-2. It's 70mHy and that's overkill.
For a 26 critical inductance is going to be about 5mHy or something like that. Of course the supply voltage will have to be high to start with.
Tre'
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Edits: 09/14/16
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Follow Ups
- RE: update 5 - Tre' 07:41:07 09/14/16 (1)
- RE: update 5 - vinnie2 09:08:56 09/14/16 (0)
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