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How much capacitance should i use for pse kt88 mp

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Posted on August 12, 2014 at 21:14:23
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 Almost finished with the power supply for my PSE KT88 stereo amp and am wondering what amount of capacitance I should use for the CLCLC PS. The power supply will use a pair of 5AR4 which are then connected to an 80uf x 550v ASC film cap. Then to a 4H x 400ma x 28 DCR inductor, then I can go with 160uf or 100uf film cap to a 5H x 300ma x 29DCR inductor then to either 100uf or 200uf film caps. The power supply is on a separate chassis so I plan to use it with other amps in the future. I have OPT from a HK citation2 and also some DYNACO A430. So, I want this PS to cope with both SE and PP amp designs. thank you for your suggestions, Dak

 

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RE: How much capacitance should i use for pse kt88 mp, posted on August 12, 2014 at 23:59:59
danlaudionut
Audiophile

Posts: 5480
Location: Schenectady
Joined: June 6, 2002
 DAK

You are going way overboard here.
I am assuming about 200mA draw.
80uf film cap - 5H - 300uf film cap
Will give you everything you want.
16mV ripple (Quiet)
No oscillation or overshoot
Fairly quick recovery (.1sec)

DanL



 

RE: How much capacitance should i use for pse kt88 mp, posted on August 13, 2014 at 01:38:03
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 Exactly what I was aiming for. A power supply that would not compromise any of the upstream devices or any future amp that I decide to build, within the voltage range. thank you for checking. best regards, Dak

 

RE: How much capacitance should i use for pse kt88 mp, posted on August 13, 2014 at 06:54:33
rage
Audiophile

Posts: 793
Joined: December 17, 2010
 I'd see if that 4h choke will hold up to choke input duty, then run the 100uf-200uf caps.

something like 4h, 200uf, 5h, 200uf

 

RE: How much capacitance should i use for pse kt88 mp, posted on August 13, 2014 at 22:12:58
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 Yeah, I wish I could run choke input but my transformer's B+ is just barely adequate for a capacitor input. With cap input I will be getting around 420 maybe 430vdc. thank you for your input. cheers, Dak

 

RE: How much capacitance should i use for pse kt88 mp, posted on August 17, 2014 at 04:22:35
hifipaul
Audiophile

Posts: 735
Location: NY
Joined: December 22, 2008
The first cap should be no more than 20uf. This will extend the life of the rectifier.

 

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