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Old 11th March 2006, 03:49 AM   #1
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Default Ps Filter Cap or Choke?

I plan on building a se parallell 6v6 mono amp for primary use as a guitar amp. I have a salvaged Pwr Tranny from an old Philco console I am going to use as it is good iron for this project. It has taps for 5v rectifier windings and used a 5u4 rectifier in its orginal circuit. The circuit I am basing this amp on was posted on Angela Instruments site as a "super Se 6v6 amp". My question is what gives with the filtration characteristics between capacitor ps filters and choke designs? Is one type of filter better than the other? I thought about using both caps and a choke but do not know how you would configure such a design. I also wouldnt mind being able to switch in a solid state rectifier at will in place of the 5u4 I plan on using as a consideration to building this animal. Any food for thought will be greatly appreciated. Thanks!
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Old 11th March 2006, 07:25 AM   #2
lndm is offline lndm  Australia
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Chopping and changing is not so easy. It takes time to refine a ps and swapping choke/cap at will or rectifiers is a tremendous complication. IMO you will do better to choose one, go through with it, and if you don't like it, change.

Some would say that the 5u4 will present a cleaner power supply, but the solid state is much easier and can be made good with a little attention.

The capacitor input supply will give a higher output voltage, up to 1.4 times (what you need might make the decision for you). This is the most common arrangement these days.

The choke input filter can tame the inrush current and produce a cleaner ps but you should simulate your circuit as bad component values can give wild results.
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Old 11th March 2006, 07:36 AM   #3
Nordic is offline Nordic  South Africa
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I have recently started reading up on these to start to form some knowledge on the subject, I found this page quiet informative.

http://www.geocities.com/SiliconVall...40/supply.html
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Old 11th March 2006, 07:51 AM   #4
lndm is offline lndm  Australia
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Maybe I could add, that if you chose the capacitor input ps, a small value of series resistance before the first cap is one of several small tweaks that can fix so many small problems it is worth generalising about.
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