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Old 30th June 2004, 10:20 AM   #1
jogas is offline jogas  Italy
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Default PSE 6550 schematic needed

Dear all

I am still seeking for my new amp schematic.
Does anybody have a link or a jpg for a 6550 PSE (i.e. Audio Note kit two?)

Thanks in advance
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Old 30th June 2004, 04:35 PM   #2
jim is offline jim  Belgium
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Default PSE 6550

Here's one (with KT88)

PSE KT88

Jim
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Old 30th June 2004, 05:34 PM   #3
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Hey Jim,

Thanks for the link--the amp is very pretty.

Best,

George Ferguson
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Old 30th June 2004, 10:13 PM   #4
jogas is offline jogas  Italy
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Default PSE KT88 from JIM

Hi Jim,
thanks forthe link.
I already considered this schematic, I am not an expert in PSU design but I think that 470uF as first capacitor, even if there is a choke before it, will burn very soon the 5U4G...
What you think about?

Regards
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Old 30th June 2004, 11:59 PM   #5
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It's not the size of the capacitor per se; it's the turn on surge associated with a capacitor that must be controlled when vacuum rectifiers are used. That choke protects the 5U4 very nicely.

Inductors are called chokes because they choke off ripple, surges, etc.
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Old 1st July 2004, 10:17 AM   #6
jogas is offline jogas  Italy
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.. again, I am not a designer but, having a look on the 5U4 specs, there are several rating charts referred to the capacitor input.

typical operation say

Filter input capacitor 40 uF...

I think that at the time of this tube 40uF was really a high value, 470uF was not yet even in the dreams of designers...
I still remain in my opinion that 470 Uf may shorten a lot the life of the 5U4

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Old 1st July 2004, 10:30 AM   #7
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Hi,

Quote:
typical operation say
Only this is not typical operation, the cap is situated behind the choke, moreover this is also a hybrid rectifier.

Quote:
I still remain in my opinion that 470 Uf may shorten a lot the life of the 5U4
If it were to be put in a "typical" CLC circuit the rectifier tube wouldn't last five minutes....

Cheers,
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Old 1st July 2004, 10:35 AM   #8
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That filter is choke input, not cap. I/P. Once an inductor is placed in the B+ line, the value of following filter caps. is not limited. The choke protects the rectifier from damaging surges.
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