No reason a properly designed SMPS would not work perfectly well. It is
hard to break copper, iron and diodes so for fixed use the big, heavy
linear is fine. In my recollection, there was a commercial tube amp SMPS
designed and for sale in the back of QST a few years ago. If I find the
reference, I will reply to this thread with it.
Tomm, KD7QAE
Am. Extra and power electronics engineer
On Thu, Sep 19, 2013 at 1:22 AM, Ben Burkhart <bsburkhart@gmail.com> wrote:
> Hi:
> I am looking to make / cook-up a home brew amplifier as both a rite of
> passage and to challenge myself. My main use is portable as I have no QTH
> at this time. I have a Flex 1500 and enjoy using it, but would like a bit
> more than QRP at times. With tube prices really high 3CX800 (Hi-HI) are at
> this time I would like to use possibly a GI-46B or GI-7BT in a grounded
> grid configuration. Hence the need for a lightweight power supply for 2.2kv
> @ 400ma. Some or most of the transformers I have found are in the 40LBS+
> range and are a little heavy for portable use.
>
> I am a networking engineer by trade with a bit more than basic under
> standing of electronics. I have been looking at several amplifier designs
> by several different people / companies and came across an observation thus
> my question. Why are all B+ power supplies simple linear setups? Why not
> use a switch mode power supply? I have yet to see one in a tube based
> amplifier. SMPS would allow for better power factor, smaller size and w
> eight, better B+ regulation, smaller filtering capacitors.
>
> I wouldn't really accept the idea that SMPS designs are more complicated
> as they are well understood and documented. I have the idea that the
> fundamental switching or voltage feedback freq would wind up in the output
> but with a properly low pass filter that should not be an issue. So the
> question is: Does the amateur community use linear supply as it has always
> been this way or am I missing something.
>
> Ben Burkhart
> KJ4CGX
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>
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