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> Power Supply Fot A Tubed Olson Side-bander
yero
Posted: April 16, 2012 02:54 am
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I have two of the olson tube side-bander ham unit. I want to use the chassis and big power transformer to build a tube amp. the power supply uses a vibrator. Is the transformer HV or does the vibrator generate the HV B+ yero
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Nothing40
Posted: April 16, 2012 04:33 am
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The vibrator produces a chopped DC,which is fed to the transformer,and you get the HV out of the secondary side.

Be sure to check/replace the noise filtering caps and choke(s) around the vibrator circuit,or you may end up with a very noisy supply.

Here's some links/info:
http://radioremembered.org/vpwrsup.htm
http://cool386.tripod.com/vibservice/vibservice.html
http://www.slideshare.net/ionela13/vibrato...r-supply-design
http://www.electronixandmore.com/articles/...upplies.html#11


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Geek
Posted: April 16, 2012 04:39 am
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The cap across the vibrator contacts is critical too... like on a set of old breaker points, if it's kaput, your contacts will soon be as well and efficiency will be hideously low.

Cheers!


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CWB
Posted: April 16, 2012 02:01 pm
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yep ... the "buffer caps" .

the power transformer may have dual voltage capabilities ...
there is a 110 winding and a "mobile" vibrator driven winding (might be switchable between 6 and 12 volt) .

a schematic of the units is the absolute best way to know exactly what is going on .

what kind of amplifier are you building ?


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yero
Posted: April 19, 2012 03:52 pm
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an audio power amp. was hoping to utilize parts from the sidebander. I can't find a schematic. there may be a usable inductor or output transformer? The case (chassis) may be all that I can salvage. any suggestions?
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CWB
Posted: April 20, 2012 12:40 am
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you might be better off selling the radios on ebay and then using that money to buy parts .
with the age of those radios ... the parts in them are a might bit "iffy" .
say , a resistor that has changed value or a leaky (electrically) coupling cap ...
this can cause all sorts of problems and trying to find it is difficult .
there is nothing like building a problem into something .


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