On Oct 15, 2005, at 3:46 AM, Gudguyham@aol.com wrote:
>
> In a message dated 10/14/2005 8:10:19 P.M. Eastern Standard Time,
> aa4lr@arrl.net writes:
>
> However, with 110, the I^2R losses in the wiring are quadrupled.
>
>
>
>
> Amen! Most would think that the losses are only doubled, but in the
> case of
> the Sb-220 the losses are quadrupled because the Sb-220 uses a doubler
> circuit
> in the HV power supply.
A FWD and a FWB of equal output performance produce virtually the same
recurrent peak-currents in the mains. The main difference between a
FWB and a FWD is that the doubler needs 2x as much filter-C but only
about half as much secondary insulating paper in the transformer. This
allows the xfmr builder to use large diameter Cu wire in the secondary.
> No doubt that #14 wire on 220V for a short run for
> an SB-220 is adequate. #12 wire is better yet and will handle
> something
> like an Al-1500 amp just fine. However, when the day comes you get
> that beastly
> amp, the #10 wire is nice to have available. Since I like to build
> my own
> amps I have one great big power supply with a Variac on the primaries
> fed with
> #8 wire good for 40 amps. I set the Variac for whatever plate voltage
> I
> want. The supply is good up to 5KV at 2 amps CCS. As someone
> mentioned most
> houses are wired with #14 or #12 wire to most bedrooms, usually more
> that one
> room on a circuit. In most cases you would find #14 wire in a
> bedroom 120V
> circuit, this is fine for any 100 watt radio, but running an amp on
> the same
> line at 120V is NOT recommended. If the line is #12 wire it will
> work OK, but
> expect a voltage drop that will cause decreased output. Their is NO
> substitute for running a dedicated 220V line for any amplifier (even
> an Sb-200).
> Voltage drop on the primaries of a HV transformer in any amp is NOT
> your
> friend!! This brings an interesting thought, the line voltage
> entering most homes
> today vary widely. I have seen as low as 115 volts and as high as
> 123volts.
> On the other side 230volts and as high as 246volts. I personally
> have 236
> volts and a friend of mine has 245volts. My amp at his house puts
> out more
> power as a result of this. Of course this is why he beats me in
> pile-ups :-)
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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