[Amps] High Voltage Switching Supply

[Steve Harrison]

Tim Hulick, that's the W9 whose name I was trying to remember (still
can't recall his call, though). He started with an article in QST IIRC
around the early '90s that grew into a two- or three-part early or
mid-90s QEX full-details article on the design of his switching power
supply. I felt the loss keenly when he passed, as we corresponded
extensively and he was always very helpful and kind. His stories of his
exploding FETs and IGBTs were something to read 8-).

Steve, K0XP


On 2/29/2024 5:48 PM, jtml at losalamos.com wrote:
> Yes, i remember the 2017 design. The earlier one, the 8877 amp with Watts Unlimited power supply, is likely not available anymore since Tim Hulick is SK.
>
> John
> K5PRO
>
> On Feb 29, 2024, 3:39 PM, at 3:39 PM, Joe<nss at mwt.net>  wrote:
>> Nope the one I remember is Jan of 2017
>>
>> Joe WB9SBD
>> .
>>
>> A Contest 40 Years in The Making!
>> <https://w9et.com/home.html>
>> MAIDENHEAD MAYHEM
>> https://w9et.com/home.html  <https://w9et.com/home.html>
>> On 2/29/2024 4:07 PM, Paul Decker wrote:
>>> John,
>>> Is this what you are thinking of?
>>>
>>> https://www.arrl.org/files/file/Technology/6Mhanson8877.pdf
>>>
>>> Paul.
>>> KG7HF
>>>
>>>
>>>> Message: 1
>>>> Date: Thu, 29 Feb 2024 11:00:56 -0700
>>>> From:"jtml at losalamos.com"   <jtml at losalamos.com>
>>>> To:amps at contesting.com
>>>> Subject: [Amps] High Voltage Switching Supply
>>>> Message-ID:<081961a2-8f35-4c0d-8651-18f0560c6cca at losalamos.com>
>>>> Content-Type: text/plain; charset=UTF-8
>>>>
>>>> I thought there was.a design on QEX at one time. But maybe it was
>> QST?
>>>> There are some consumer microwaves that use AC/DC converters in
>> switchmode.
>>>> We have commercial 10 kW Glassman switchers at work that put out
>> 1500 VDC at 6 Amps but they are not cheap. They power screen grid on
>> TH628L RF tube.
>>>> John
>>>> K5PRO
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