Collection policy was Re: No space for vinatge computers in

From: Philip Pemberton <>
Date: Mon May 26 02:54:00 2003

In message <m19K2Ap-000IzYC_at_p850ug1>
 (Tony Duell) wrote:

> Even then you'd not be totally lost without a schematic if you knew the
> type of valve that was supposed to go there (quite likely to be a double
> triode, actually). The heater connections should be darn obvious, and you
> can easily distinguish grid from anode from cathode with a little
> practice. The only problem would be keeping the right anode/grid/cathode
> together.
I'm not that good with vacuum tube circuitry, but if the computer is based
on digital logic or microprocessor technology and the parts are available,
I'd at least have a go at fixing it. Now I've developed a trick for getting
the parts that are to be replaced out of the PCB without FUBARing it...

> Anway, can somebody please tell me how running a machine (as opposed to
> having it on statick display) is going to cause valve holders to break in
> half?
Valve overheats, base was (hypothetically) made of crappy materials, base
cracks, then the heat of the valve cracks it in half or whatever.
Highly unlikely, but not outside the realms of possibility. Then again, it
could have occured during shipping...

> > The oldest machine I've worked on... Hmm... That's a tough one... I guess
> > that would be the Jupiter Cantab "Ace" computer I'm restoring^W rebuiling.
> Oh, a relatively new machine (must be, it's got one of those new-fangled
> microprocessors [1] in it) :-)
I'm more interested in collecting old home computers. I have been known to
break that rule once or twice, though.

> [1] As opposed to an old-fashioned microprocessor, meaning a sequencer
> running microcode. Both DEC and HP used the word in this sense in the 1970s.
Didn't I mention that I was planning to buy some LS logic chips and build my
own CPU?
Then again, I might just cheat and buy an FPGA...

Received on Mon May 26 2003 - 02:54:00 BST

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