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Old 21st June 2006, 10:17 PM   #11
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Join Date: Apr 2005
Location: ffx station, va
My mistake. You are correct, it is an Isco 494. I am without repair info as well, but it shouldn't be that hard. Inside, it is mostly empty. A grapefruit sized transformer, a bank of a dozen or so big electrolytics, and some tva's on the circuit board. Everything else is sand, switches and meters.

You having a problem with yours, or just itching to fuss inside?
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Old 22nd June 2006, 12:43 AM   #12
rdf is offline rdf  Canada
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Join Date: Jun 2004
Location: big smoke
A little of both. Mine's hitting the third decade so a rebuild is very warranted. It also appears to be out of calibration, going into limiting early in some ranges and settings. It's time to replace trim pots too. With anything this old running a couple kilovolts it's just the wise thing to do. Wouldn't mind getting the next 20 years of use either.
Ears aren't microphones.
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Old 22nd June 2006, 01:13 AM   #13
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Join Date: Apr 2005
Location: ffx station, va
Well, I sent a query to Isco, so we'll see. Maybe they will be helpful. Krohn-Hite wanted like $200 for a manual. Idiots. So, we'll see. Weller, on the other hand just shipped me some parts for free for some old gear, so you never know.
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Old 4th October 2013, 03:27 AM   #14
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Join Date: Jan 2006
Location: hanoi

Sorry for digging up an old topic, but recently I came up with this same idea of stacking up fixed regulated PSUs on top of a variable one for HV bench supply.

Currently I have a Kikusui PCM350-0.2A which can vary from 0-350V @0.2A, and the maximum desired B+ is approx. 1kV so all left is to build 2 units of fixed 300-350V/0.2A.

I did some quick searchs thru the forum but havent found any design which can withstand multi-purposes need: short circuit protection, high capacity load, decent quality... yet simple enough for homebrew (I tried open the Kikusui but the inside is way too complicated to follow).

So, is my standard too high, or is there any solution that I dont know?
Your opinions are well appreciated.


Last edited by hoangduongo; 4th October 2013 at 03:32 AM.
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