Amps
[Top] [All Lists]

Re: [Amps] Buck-Boost Transformer Selection

To: Jim W7RY <w7ry@centurytel.net>, amps@contesting.com
Subject: Re: [Amps] Buck-Boost Transformer Selection
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Wed, 25 Jun 2014 21:29:01 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>

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@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@outlook.com
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>