Reproduction micros

Karl-Wilhelm Wacker kwwacker at
Fri Jul 22 15:20:44 CDT 2016

If these are switching power supplies, the fizzing may be the output filter 
overheating and about to pop their safety 'corks' due to self heating due to
high ripple currents.

I can across this probelm in a Clary Datacomp 404 computer that I worked
on in the late 60's.  The initial fix was a plastic sheild across the top of 
the caps
so that if they vented while a tech was working on the unit, they would not 
the fluid inside them into the tech's face.


----- Original Message ----- 
From: "Adrian Graham" <witchy at>
To: "General Discussion: On-Topic and Off-Topic Posts" 
<cctalk at>
Sent: Friday, July 22, 2016 3:36 PM
Subject: Re: Reproduction micros

> On 22/07/2016 10:04, "Pete Turnbull" <pete at> wrote:
>> On 22/07/2016 00:33, Adrian Graham wrote:
>>> On 22/07/2016 00:07, "Liam Proven" <lproven at> wrote:
>>>>> There were only a few
>>>>> made.  They were used internally during development - hence the podule 
>>>>> to
>>>>> connect it to a Beeb, which provided the I/O early on - and in the 
>>>>> later
>>>>> stages before the Archimedes launch in 1987, several were loaned to
>>>>> software
>>>>> developers.
>>>> This is the machine Dick Pountain reviewed, I think.
>>> Pretty sure I've got 2 of those, the keyboards are made of Dark Matter. 
>>> I've
>>> never dared power one up though.
>> If you have those, I would strongly recommend you arrange an offsite
>> backup.  Say, about 170 miles north via the A14/A1 :-)
> I remember why I've never fired them up, this is the label on the one with
> the Beeb connecting podule:
> Of course 'smoke' in these PSUs just means the mains cap has blown but I'm
> not sure about the fizzing.
> -- 
> Adrian/Witchy
> Binary Dinosaurs creator/curator
> - the UK's biggest private home computer
> collection?

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