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Old 19th February 2016, 12:02 AM   #11
Tubelab_com is offline Tubelab_com  United States
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As suggested, copy an existing design with minimal changes. The gain of the error amp is one piece of the puzzle that determines the stability of the power supply. Any new design should be analyzed for gain and phase margin. I have a paper design with LT spice simulations for the BIG one, 0 to 750 volts, 0 to 2 Amps. It is though, completely solid state. I will build it some day to replace the 3 dinosaurs currently on my bench.

For now, I would build something like this. One of the dino's on my bench is this KG-664. I got it used at a hamfest for $25 maybe 20 years ago. It finally died due to being left in an unheated building during last years winter when it hit -12 degrees. I replaced all the electrolytics and it is live again. I routinely overload it to 300 mA or more and often hang a 100 uF motor run cap across the output without issue. It is rated for 200 mA. Leave out two pass tubes for a 100 mA version. Rectification is SS, you can substitute 5 watt zeners for the VR tubes.

Pete Millett has a bigger version with simple current limiting on his web site, schematic attached.
Attached Files
File Type: pdf KG-664_Manual.pdf (693.8 KB, 129 views)
File Type: pdf HV_BENCH_PS_SCH.pdf (39.4 KB, 151 views)
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Old 19th February 2016, 12:49 AM   #12
audio king is offline audio king  Canada
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Quote:
Originally Posted by BinaryMike View Post
Here's a schematic that might be useful -- from my archive. Unfortunately, I haven't always been good about noting sources. It might have appeared in one of those big Markus books.
I have an ancient Lambda that looks similar. I don't think too many manufacturers used 6Y6's as pass tubes.
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Old 19th February 2016, 02:59 AM   #13
HollowState is offline HollowState  United States
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I've got a couple of these Kepcos. 0-600 volts at 300 mills. These things are built like tanks and never really die. This one may just need a delay tube. They use 6336's for series pass tubes and 5R4 rectifiers. Yes, it's a boat anchor.
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Old 19th February 2016, 05:32 AM   #14
smoking-amp is offline smoking-amp  United States
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Join Date: Dec 2001
Location: Hickory, NC
Knight KG-664 $250
(2 pics) Kepco 615B $175
(3 pics) ISCO 494 $15
Heath SP-2717a $115
EICO 1030 $100
Fluke 407D $200
Xantrex XT-250 $110
Attached Images
File Type: jpg KG-664-1.jpg (252.0 KB, 366 views)
File Type: jpg Kepco1.jpg (61.5 KB, 362 views)
File Type: jpg Kepco2.jpg (63.8 KB, 303 views)
File Type: jpg ISCO_494.jpg (77.2 KB, 305 views)
File Type: jpg ISCO494.jpg (258.1 KB, 301 views)
File Type: jpg Isco494-b.jpg (248.8 KB, 85 views)
File Type: jpg Heath_SP2717.jpg (175.4 KB, 90 views)
File Type: jpg Eico_1030.jpg (275.9 KB, 84 views)
File Type: jpg Fluke_407D.jpg (69.6 KB, 81 views)
File Type: jpg rsz_xantrex_xt-250.jpg (161.6 KB, 82 views)

Last edited by smoking-amp; 19th February 2016 at 05:45 AM.
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Old 19th February 2016, 05:38 AM   #15
jazbo8 is offline jazbo8
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How is the ISCO 494? Do they work well?
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Old 19th February 2016, 06:04 AM   #16
smoking-amp is offline smoking-amp  United States
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I don't have an ISCO 494 power supply myself (I originally suggested electrophoresis supplies as a possiblility), several members have gotten them. They are a high quality lab supply (34 Lbs, with a big xfmr and likely SCR phase control) (there are newer models with digital readouts and probably HF switchmode design and light weight/compact). The company is still in business, and has provided a complete manual with a schematic to the members who have gotten them.

The electrophoresis type supplies in general may have a ground fault current interrupter (safety) and a minimum load kick-out (no load, no run - safety), which may need over-riding. One unusual feature is Watt limiting, besides current limiting. This could be quite useful for tubes.

Some electrophoresis supplies like Fisher BioTech and E-C Apparatus do not filter to clean DC, but the ISCO is filtered. Maybe someone who has one will chime in. I think someone mentioned the ripple/noise was around 45 mV, but not sure.

A few more HV supplies:

HP 6448B $250 (900 Watt, SCR phase control, heavy xfmr, 60 lbs)

Xantrex XHR-600-1.7 $300 to $1000 lately (used to be $100 a few years ago, HF switch-mode, 600 or 1000 Watt models, 11 lbs, digital readouts, isolated PC digital interface, compact) (this is what I have)

Xantrex XG and XTR 600V book size power supplies, $1000+

And there are a bunch of other newer Lambda, EMS, DCS ... 600V rack mount switching power supplies that can range from $100 to $300 or more.
Attached Images
File Type: jpg rsz_hp_6448b.jpg (124.0 KB, 94 views)
File Type: jpg Xantrex_XHR600.JPG (104.2 KB, 81 views)
File Type: jpg XG600.jpg (265.2 KB, 77 views)

Last edited by smoking-amp; 19th February 2016 at 06:25 AM.
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Old 19th February 2016, 06:20 AM   #17
jazbo8 is offline jazbo8
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Quote:
Originally Posted by smoking-amp View Post
HP 6448B $250 (900 Watt, SCR phase control, heavy xfmr, 60 lbs)
I would take one at that price but it seems to be quite a bit more these days.
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Old 19th February 2016, 06:48 AM   #18
smoking-amp is offline smoking-amp  United States
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Here is a "fix-up" HP 6448B for $250. Not that much to them actually. (xfmr, SCR, capacitor, control circuit) But I would get a newer Lambda TCR-600 for cheaper. (same SCR design)
Vintage HP Hewlett Packard DC Power Supply 6448B 0 600V 0 1 5A Powers on Read | eBay

Here is an old HP177A, bid at $14.50 so far, 17 hours to go.
HP 177A Power Supply 0 500 Volt Regulated DC Agilet Keysight | eBay

Lambda TCR-600 fix-up $80
Lambda TCR 600S1 1 D 0813B Power Supply | eBay

Lambda TCR-600 $120 fix-up
Lambda EMI TCR 600S1 1 D 0813B Programmable 600V 1A DC Power Supply Parts Repair | eBay

I used to get the Xantrex XHR-600 supplies as "not working" for $50. Most of them either just needed some configuration DIP switches set on the back, or the current sampling resistor was burned out from a hard "user" short (big cap inside), or they had a custom remote power on mod. Easy fixes. I had one that had a burned through MosFet H bridge side, two Mosfets to replace (not so easy). However, it is hard to get service info for Xantrex, you have to use the IC control chip datasheet. Usually close. A LOT of other circuitry in them besides the main supply though, two micros for the isolated PC interface, A/D and D/A for remote control/monitoring and front panel display, a whole analog isolated interface board, auxiliary supplies to run all those. Never had any problems with other stuff though, except for calibration, lots of pots. Big user manual for setting them up and calibrating.
Then another big manual for programming them remotely. GPIB or RS-232 versions. But I really like the easy front panel interface, ten turn or single turn knobs. I hate some other supplies that have push button numerical programming.

I'm wondering what they will do for the next products beyond the "book size" models. The knobs are so small already on those. Probably verbally talk to the supply.

Last edited by smoking-amp; 19th February 2016 at 07:16 AM.
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Old 19th February 2016, 07:35 AM   #19
jazbo8 is offline jazbo8
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Thanks! Many to pick from...
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Old 19th February 2016, 07:21 PM   #20
BinaryMike is offline BinaryMike  United States
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Playing the other side of the field for the moment...

There is at least one simple way to make a useful HV bench PSU: Just build out a rectifier/filter system with low impedance, then put a variac in the incoming AC line. The output voltage will be about as stiff as a typical tube amplifier power supply, which can actually be beneficial during circuit development.

One could also argue that a good high-perveance pass tube with its grid tied to a simple variable voltage source, sans error amplifier, will yield PSU regulation similar to a conventional vacuum rectifier hookup -- assuming solid-state rectifiers upstream.
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