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Old 27th March 2013, 02:46 AM   #471
Anchan is offline Anchan  United States
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Talking Power Supply Questions

Hello,

I plan to build this Amp, as outlined in Juma's first post. I just ordered 20 pair of the 2SJ313/013 from Prakit, so I will soon have some matching to do. I will be making a slight variation, so have a few questions.

1) I already have 2 Vicor FlatPac switching supplies, which I would like to use. I plan on building the power supply section in a separate box from the main amp. The supplies are 24V, but can be trimmed down to 20V. Obviously one would be used for the (+) and the other for (-) sides. They are not matched, but are from the same series. One is rated at for 8.3A and the other is 6.25A. Will the 6.25A be enough, or it important that they both be the 8.3A model?
http://cdn.vicorpower.com/documents/...ds_flatpac.pdf

2) I plan on using an LC filter on the power supply outputs. Page 30 of the link below recommends 200nH. I found this Digikey #732-2146-1-ND which looks comparable. The datasheet recommends tantalum caps. But is that critical? No electrolytics? Opinions on the LC filter in general?
http://cdn.vicorpower.com/documents/...ual_200J00.pdf

3) Over on swap meet, Tony399 is selling a stash of 2SK170/74s. What Vds/Idss do I need? He will match. I'm sure this info is somewhere, but I can't find it.

4) I realize that the PCB's that Georg made are all gone. Anyone else interested in a set? Maybe if the requests go up, he can make another run?

Thanks!
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Old 27th March 2013, 10:11 PM   #472
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Hi.
I have already received the PCBs.
Thanks, Georg!
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Old 28th March 2013, 10:57 PM   #473
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Hi JethroTull,

I really liked your first few albums, but somewhere in the middle of "Thick as
a Brick" it started to pall for me. Thanks anyway.

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Old 28th March 2013, 11:18 PM   #474
Zen Mod is offline Zen Mod  Serbia
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luckily for them then I was born , to became World Greatest Jethro Tull fan , sucking even "A" drek



say Tull , I'm stoned
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Old 29th March 2013, 12:10 AM   #475
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Monty Python - Naked Organist - YouTube The flute is there somewhere too.

Scots are all a bunch of perverts, who else thinks up names like 'kcoC rehtaeW', or 'Songs of the Woody'.

(and they're thick as a brick as well)
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Last edited by jacco vermeulen; 29th March 2013 at 12:13 AM.
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Old 29th March 2013, 12:17 AM   #476
Zen Mod is offline Zen Mod  Serbia
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agree

they're almost dutchienutz

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Old 29th March 2013, 12:27 AM   #477
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Hi all.

"Thick as a Brick" ¿¿?? What is this?
Jethro Tull was an agronomist.
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Old 29th March 2013, 12:34 AM   #478
massimo is offline massimo  Italy
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Don't you really know what Thick as a Brick is?
Oh boys! You must be very young.
Jethro Tull - Thick as a Brick full - YouTube

One of the most famous song when we were young
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Old 29th March 2013, 12:36 AM   #479
Zen Mod is offline Zen Mod  Serbia
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same as Ian Anderson is

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Old 29th March 2013, 12:49 AM   #480
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Quote:
Originally Posted by massimo View Post
Don't you really know what Thick as a Brick is?
Oh boys! You must be very young.
Jethro Tull - Thick as a Brick full - YouTube

One of the most famous song when we were young
THANKS!!
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