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Old 11th January 2013, 07:45 PM   #3731
euro21 is offline euro21  Hungary
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Hi Jogi,

I think old style (nontensioned) direct heating tube and horizontal positioning is very dangerous combination.

At one time, one of my (almost) 90 years old Orion (hungarian) rectifier tilted about thirty degrees ... and immediately died. :-(
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Old 11th January 2013, 07:50 PM   #3732
Jogi is offline Jogi  Germany
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Yes, you are right, it is a bit risky, but was the only way to squeeze the tube in. If the filament hangs a little bit too much--bang, short and over. But I bought this one for 4 because the getter was loose, and have some more different AZ1 for spare.
I would not do this with a WE 300B
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Old 11th January 2013, 07:58 PM   #3733
Salas is offline Salas  Greece
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Nice classic looks.
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Old 14th January 2013, 11:14 AM   #3734
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Hi all.
So I've just put together my SSHV2 board.
My target is about 210v at 72ma (+20ma). The ccs only manages 72ma though with a real load.
My initial testing had a dummy load of 2.5k, which I now realise was wrong (the psu will drive 4 ccs loads, each of which outputs 180v, 18ma). The incorrect dummy load gave me 210v and 92ma
I also now see what a difference a few hundred ohms makes in that range.

So what are my options for getting the ccs up to level?
I've trawled through the thread, but it information is tricky to find sometimes!
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Old 14th January 2013, 11:39 AM   #3735
Salas is offline Salas  Greece
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Make the 10 Ohm TP resistor 1 Ohm. So to unleash almost all IDSS available under the particular CCS DMOS pair. Mind you, after that you should read mV for mA at test point. How high Vin-Vo you got BTW?
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Old 14th January 2013, 11:36 PM   #3736
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I'll give that a go later in the week.

My Vin is 280V, so that's a 70V drop with a Vo of 210V.
The current Vo is 160V !!!

There is a massive heatsink attached to this thing (the ccs heatsink is the regular pcb mount type)
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Old 14th January 2013, 11:45 PM   #3737
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Quote:
Originally Posted by Salas View Post
Check Vgs and Vbe on all semis to pinpoint broken ones.
Many thanks, already did, opted to substitute all, and board is back running .
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Old 15th January 2013, 12:23 AM   #3738
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Quote:
Originally Posted by lordvader View Post
I'll give that a go later in the week.

My Vin is 280V, so that's a 70V drop with a Vo of 210V.
The current Vo is 160V !!!

There is a massive heatsink attached to this thing (the ccs heatsink is the regular pcb mount type)
70V drop, it is very big, only need 20V drop.

you can art the R 470 Ror 1K/5W before SSHV shunt!
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Old 17th January 2013, 10:44 AM   #3739
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Quote:
Originally Posted by quanghao View Post
70V drop, it is very big, only need 20V drop.

you can art the R 470 Ror 1K/5W before SSHV shunt!
It is a big drop, but 70v with 92mA is well within the limits of my heatsinks.
FWIW, I replaced R5 with a 1 ohm resistor, and he voltage is steady at 210v. The current started at 93ma, and slowly drifted to 92.5.
The next plan is to leave it running for a while, then readjust. How long will be ideal before I can deem everything stable?

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Old 17th January 2013, 12:16 PM   #3740
Salas is offline Salas  Greece
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30 mins should be enough to recheck settings, then after say an hour. Until ambient rests if in a box is the condition.
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