Author: Dave.HDate: 22:51 03-12-07
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I'm thinking of buying the Antique Electronic Supply one tube
transmitter, but I need to swap the transformer over for one that
handles 240 volt, gives out 125 volts. Can anyone tell me of any
Australian online sources for this?
Schematic http://www.geocities.com/raiu_harrison/mwa/tech/aes2.gif
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Author: Phil AllisonDate: 23:47 03-12-07
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"Dave.H"
> I'm thinking of buying the Antique Electronic Supply one tube
> transmitter, but I need to swap the transformer over for one that
> handles 240 volt, gives out 125 volts. Can anyone tell me of any
> Australian online sources for this?
>
> Schematic http://www.geocities.com/raiu_harrison/mwa/tech/aes2.gif
>
** Far easier to buy a small 240 /120 stepdown from Dick Smith ( cat:
M1155)
Mains transformers like that one were obsolete over 40 years ago.
..... Phil
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Author: Dave.HDate: 04:48 04-12-07
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I was looking at that stepdown convertor. Should I power it directly
from that, and remove the old transformer, I've been told it's an
isolation transformer. Since the transmitter's designed to be
installed on a wood base high voltage exposed, it would need one. But
I'm gonna install it in a plastic box for safety reasons (with two
very inquisitive cats, we can't have exposed high voltage like that.)
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Author: Phil AllisonDate: 06:36 04-12-07
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"Dave.H" <the1930s@googlemail.com>
** Adjust your setting on Google Groups so that the prior text is quoted
!!!
Essential - do it now.
> I'm thinking of buying the Antique Electronic Supply one tube
> transmitter, but I need to swap the transformer over for one that
> handles 240 volt, gives out 125 volts. Can anyone tell me of any
> Australian online sources for this?
>
> Schematic http://www.geocities.com/raiu_harrison/mwa/tech/aes2.gif
>
** Far easier to buy a small 240 /120 stepdown from Dick Smith ( cat:
M1155)
Mains transformers like that one were obsolete over 40 years ago.
>I was looking at that stepdown convertor. Should I power it directly
> from that,
** Don't be so fucking stupid.
You need 125 volts AC for HT and a *separate* 12 volts AC for the tube's
heater supply .
....... Phil
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Author: Dave.HDate: 06:53 04-12-07
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Isn't it unsafe to use a 60Hz transformer on 50Hz? I've been told
several times it is, unless that transformer is designed for both
frequencies. Guess I can always try it to find out.
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Author: Phil AllisonDate: 08:02 04-12-07
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"Dave.H" <the1930s@googlemail.com>
** Adjust your setting on Google Groups so that the prior text is quoted
!!!
Essential - do it now.
DICKHEAD !!!!!!!!!!!!!!!!!!
...... Phil
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Author: Tim WescottDate: 12:14 04-12-07
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On Tue, 04 Dec 2007 03:53:43 -0800, Dave.H wrote:
> Isn't it unsafe to use a 60Hz transformer on 50Hz? I've been told
> several times it is, unless that transformer is designed for both
> frequencies. Guess I can always try it to find out.
It depends on how much margin is built in. Have you tried a web search
on old electronics places in Oz? Have you emailed AES to see if they can
help you out?
Try rec.radio.amateur.boatanchors -- perhaps there's an Australian who
frequents that group.
--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com
Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
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Author: radiosrfunDate: 13:09 04-12-07
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"Tim Wescott" <tim@seemywebsite.com> wrote in message
news:pNWdnbp1n8NqF8janZ2dnUVZ_jidnZ2d@web-ster.com...
> On Tue, 04 Dec 2007 03:53:43 -0800, Dave.H wrote:
>
>> Isn't it unsafe to use a 60Hz transformer on 50Hz? I've been told
>> several times it is, unless that transformer is designed for both
>> frequencies. Guess I can always try it to find out.
>
> It depends on how much margin is built in. Have you tried a web search
> on old electronics places in Oz? Have you emailed AES to see if they can
> help you out?
>
> Try rec.radio.amateur.boatanchors -- perhaps there's an Australian who
> frequents that group.
>
> --
> Tim Wescott
> Control systems and communications consulting
> http://www.wescottdesign.com
>
> Need to learn how to apply control theory in your embedded system?
> "Applied Control Theory for Embedded Systems" by Tim Wescott
> Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
Seems to me, I've seen many items labeled for operation "AS" - 50-60 or
50/60 Hz. Seems to me also - years ago - I read there is a margin - call it
a fudge factor if you will - built in - to handle any variation from the
Power Company. Maybe those principles don't apply worldwide - I don't know.
My 2 cents - fwiw.
Lou
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Author: Rich The Newsgroup WackoDate: 19:22 05-12-07
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On Tue, 04 Dec 2007 01:48:12 -0800, Dave.H wrote:
> I was looking at that stepdown convertor. Should I power it directly
> from that, and remove the old transformer, I've been told it's an
> isolation transformer. Since the transmitter's designed to be installed
> on a wood base high voltage exposed, it would need one. But I'm gonna
> install it in a plastic box for safety reasons (with two very
> inquisitive cats, we can't have exposed high voltage like that.)
Cats loose in the house? I thought that was what exposed HV was supposed
to take care of! >:->
Cheers!
Rich
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