Iain M Churches
Guest
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 Posted:
Mon Oct 24, 2005 8:07 pm Post subject:
Re: Designing a lab power supply for tube experimenting |
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"Jon Yaeger" <jono_1@bellsouth.net> wrote in message
news:BF7FAF8A.3C4AA%jono_1@bellsouth.net...
| Quote: | in article Onl6f.165430$xl6.149633@tornado.tampabay.rr.com, west at
westley@tampabay.rr.com wrote on 10/22/05 2:55 AM:
"Jon Yaeger" <jono_1@bellsouth.net> wrote in message
news:BF7EDAD7.3C46C%jono_1@bellsouth.net...
in article 43596055$0$171$edfadb0f@dtext02.news.tele.dk, Peter Andersen
at
peterandersen@mespilus.dk wrote on 10/21/05 5:40 PM:
Hi
I would very much like to have some ideas, schematics, tips on how to
design
a lab power supply for experimenting with tube designs. The
specifications
could be like 0-500V 0-100mA... (+/-?)
I would like to build a good regulated power supply. Could i just
design
it
like a normal low voltage PSU? like a opamp, voltagedivider, a BU508 as
seriesregulator, and a couple of high voltage caps.??
Please mail me any kind of schematics and give me some help and hints
about
this project...
Peter
Save yourself a lot of grief and buy a used Heath SP-17A power supply.
I
saw one for sale for $50 here:
http://www-stlg.remote.arrl.org/RadiosOnline/ads.html?ordby=&wanted_category
=Power+Supplies
Or do the eBay thing.
Jon
Jon,
Do you think a 100ma HT supply will be adequate?
west
Not for many power amps under some conditions. No problem for preamps or
low wattage stuff.
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Bench supplies at 100mA are usually variable up to 350V.
The Farnell (UK) type E350 is typical.
Even the Rozenblit design (100mA to 400V) cannot drive a
pair of KT88's. I found an old Solatron valve psu (60kilos)
which can supply 600V at 0.5A. I paid Euro 100 for it.
It works perfectly. It seems that no-one wants
junk like that these days:-))
Iain
Iain
Iain.
>
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