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. 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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