I have a Racal respirator too. It is a nice piece of kit. I did not
know they had gone bust. The thing that is likely to need replacing
first is the battery. It is quite easy to make a spare. I have already
done this because it is useful to have two batteries and the Racal
price for a replacement was exorbitant. I used a proprietary battery
holder (which is not essential), three rechargeable AA batteries, a
small (mono) jack plug, and short piece of wire. This assembly will
not fit into the battery holder in the respirator but it is easy to
tie it onto the top head band. It can be charged with the charger
supplied with the respirator. I think the jack plug size is 3.5 mm.
E-mail me if you need to know for sure and I will check.
If you have no local source for the bits and pieces have a look at:
http://www.maplin.co.uk/
Brian Clifford
at The Woodturner's Workshop
www.turningtools.co.uk