Date   : Thu, 11 Dec 2003 20:13:47 +0000 (GMT)
From   : Sprow <info@...>
Subject: Re: Master 128 power supply

In article <20031211144655.4A38543A0E@...>,
   Nick B. <nick@...> wrote:
> Hi,
> Can anyone tell me if the master series and model B power supplies are
> interchangeable?

Not really.
Mechanically they're quite different,and the Master motherboard takes less
current than the BBC B and the PSU is adjusted acordingly.

> I think my Master 128 is ready for refurbishment - Lots of strange noises
> from the speaker when ccarrying out disk operations   or trying to use my
> teletext decoder. 12v rail measures 11.3v.

Quite normal (well,as long as it's not a loud noise!) this is due to bus
activity - you can fix it,or at least make it better,with a 10k resistor on
the 1MHz bus connector.Details on my website.
11.3V is within 10% of 12V,so nothing to worry about there either,
Sprow.