[Amps] Buck-Boost Transformer Selection

[Jim W7RY]

Does the Quadra have a switching power supply?

73
Jim W7RY


-----Original Message----- 
From: Joe Subich, W4TV 
Sent: Wednesday, June 25, 2014 1:00 PM 
To: amps at contesting.com 
Subject: Re: [Amps] Buck-Boost Transformer Selection 


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.

73,

    ... 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!*/
>
> REPLY:
>
> Nevertheless, I would ask the power company to fix it. If they refuse,
> then go from there.
>
> 73, Bill W6WRT
> dezrat at outlook.com
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