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Re: [Amps] Buck-Boost Transformer Selection

Subject: Re: [Amps] Buck-Boost Transformer Selection
From: "Joe Subich, W4TV" <>
Date: Wed, 25 Jun 2014 16:00:06 -0400
List-post: <">>

The issue is that the Quadra was designed for the Japanese market in
an era where the common input power level was 100/200 V and typical maximum voltages were 220V. As such a 240 V maximum input voltage is
entirely acceptable ... particularly considering that the 240 V spec
even covers 110/220V that was common in North America at the time.

The VP-1000 (Power Supply) manual specifies 14A at 200/220/234V input.
I would be looking for a 250 to 220 V boost/buck transformer rated for
15A to be safe.  Solid state amplifiers of this generation tend to
have somewhat lower efficiencies than modern tube amplifiers - around
40 to 50%.  At 1000W output the amplifier is specified for 48 A at 48V
(2300 W) input - consistent with the rated 14A input.


   ... Joe, W4TV

On 2014-06-25 3:25 PM, Bill Turner wrote:
ORIGINAL MESSAGE:          (may be snipped)

On 6/25/2014 12:18 PM, Adrian Flynn wrote:
If you monitor the line voltage closely you will find that the "Power
Companies" are slowly raising the *Normal Line Voltage* to /*125 volts
per leg and 250 volts* *for both legs!*/


Nevertheless, I would ask the power company to fix it. If they refuse,
then go from there.

73, Bill W6WRT
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