5 Jun
2002
5 Jun
'02
2:59 p.m.
On Wed, 5 Jun 2002, Tothwolf wrote:
Do the heaters of the other 5 tubes in the same row
glow? IBM may have
Yes.
used 6x 25V heaters in series to avoid using a voltage
regulator. If you
find a source for the 25L6, and especially the IBM branded tube, get at
least a couple of extras. Tubes are generally very robust, but they don't
like being jarred around, and theres no telling what kind of abuse the
current tubes have been though.
Yeah, if I could find a stash of IBM tubes I would certainly buy them all
:) I'm not holding out for that. A generic tube would suit me fine.
Well, the tubes are not likely to smoke, but old
capacitors are... I'm
guessing that you've already powered the unit up by now, but I'd recommend
using a variac to bring the voltage up slowly when first powering up old
equipment such as this when it has been stored for a long time. Bringing
Yeah, we were impatient. These old machines are tough though. We didn't
have any problems.
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
* Old computing resources for business and academia at www.VintageTech.com *