I run my Drake L-7 off a 110V drop and it seems to do fine. I get about
1200 watts output with 100 watts of drive. Checking it just now, line
voltage drops from 117.7 to 111.7 VAC when I go key down with maximum
exciter drive (about 100 watts). There is a small, but perceptible dimming
of the lights in the shack and hallway (the circuit in the hallway drops
about
1.5 VAC when I key the amplifier). The shack is fed from a 20A breaker
which only pops occcasionally if I turn on the amplifier when the mode
switch is in the SSB position (presumeably the inrush current is higher in
this position). If I turn on the amplifier with the mode switch set to CW
(lower anode voltage), the circuit breaker never trips presumeably because
the inrush current is lower in this configuration. A 220 drop to the shack
is on the list, but so are many other things (the 220 service has only made
it as far as the garage so far). IMO, you can get away with it, but is not
optimal.
73 de Mike W4EF......................................
----- Original Message -----
From: "Gary Smith" <wa6fgi@sbcglobal.net>
To: "Martin J. Morgenbesser" <w7mjm@arrl.net>; "Amps List"
<amps@contesting.com>
Sent: Thursday, December 02, 2004 8:12 PM
Subject: Re: [Amps] Current draw at 110 volts for SB-200 and SB-1000
> The sb-220 will run on 110v but you will see your house lights dim and you
will see the hi voltage on the amp sag and swing all over the place.
>
> Heathkit did advertise you could run it on buck and a dime (110v) but they
didn't tell everybody that you'd being paying the price one way or the
other. Recall a fellow who did run one on 110v, you could tell when he was
hitting the mike hard . ALL of the lights in his house dimmed and
brightened.
>
> And the amp's efficiency was way down also.
>
> Wire it up, try it out see what gives.
>
> My .02,
> 73
> Gary
>
> snip
> ----- Original Message -----
> From: Martin J. Morgenbesser
> To: amps@contesting.com
> Sent: Thursday, December 02, 2004 5:20 PM
> Subject: [Amps] Current draw at 110 volts for SB-200 and SB-1000
>
>
> I'm thinking of acquiring an SB-200 or SB-1000.
>
> While I realize that it's preferable to power the SB-200 and SB-1000
amps
> from a 220 Volt AC line, I don't currently have 220 service in my shack.
> What I do have is a 110 Volt 15 Amp line.
>
> My transceiver, lights and laptop together draw maybe 5 amps from the
line,
> so I wouldn't want the amp to draw more than 7 or 8 amps.
>
> In your experience with these amps, how much RF power out can I run them
at
> while keeping the amplifier's 110 volt AC line current draw below 8
amps?
>
> Eventually, I'll probably install 220 service in the shack, but I want
to
> know if I can use these amps in the interim with only a 110 volt AC
line.
>
> Perhaps I should be looking at the Ameritron AL-811 amps which are rated
at
> 8 amps of AC line current draw for 110 volt service?
>
> Your thoughts and suggestions will be greatly appreciated.
>
> 73 de W7MJM
>
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