[cctalk] Replacing the Flyback Transformer From My VAXmate

Gregory Beat w9gb at icloud.com
Mon May 18 17:45:30 CDT 2020

Rob -

It has been 35+ years since I worked for an Apple dealer, during the Macintosh announcement (and Apple sales, service training).  I no longer have any of those documents.  
The Apple Community is extensive, and a quick Google search turned up many comments about Flyback, Damping Diode, & CRT replacements for early Macintosh.
One individual acquired a replacement Flyback from Spain ($16 USD) for his Apple.
Suggest you research those Apple owners for Mac specifications — possible replacement.


> On May 18, 2020, at 4:54 PM, Rob Jarratt <robert.jarratt at ntlworld.com> wrote:
> Thanks for this. I am having trouble finding any information on them, such
> as datasheets. Any ideas where to find this kind of information?
> Regards
> Rob
>> ==
>> From: "Rob Jarratt" <robert.jarratt at ntlworld.com>
>> To: "General Discussion: On-Topic and Off-Topic Posts"
>> Subject: Replacing the Flyback Transformer From My VAXmate
>> I am about as certain as I can be that the flyback transformer from my
>> VAXmate monitor board has failed. I know this is probably impossible, but I am 
>> wondering if there is a way to find a more modern equivalent? How
>> standardised are these things? I do see a lot that appear to have the same
>> circular arrangement of the pins.
>> The VAXmate one is a Tai-Ho TH-1802B and according the Technical
>> Description has a primary voltage of +28V and produces auxiliary voltages as 
>> follows:
>> +13.1kV @85uA max
>> +950V @200uA
>> +45V @75mA max
>> -100V @1.2mA
>> Regards
>> Rob

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