[Amps] Buck-Boost Transformer Selection

[Joe Subich, W4TV]

Yes.  It's an OEM switcher with a Yaesu control board wrapped
around it.  The service manual contains no information on the
OEM unit.

73,

    ... Joe, W4TV


On 2014-06-25 9:20 PM, Jim W7RY wrote:
> 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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