tube CD player (was Re: sizes (was Re: vacuum tube computer))

From: Eric Smith <eric_at_brouhaha.com>
Date: Mon Feb 1 20:06:30 1999

Tony Duell wrote:
> A photomultiplier isn't that bad to use. OK, it needs a kilovolt or so of
> EHT. But apart from that it's a fairly easy device to connect up and get
> a useable signal from. There should be a lot of them still about, and
> small ones aren't that expensive second-hand.

The tricky part is how to mate this with the mechanical assembly. Even
the laserdisc players that used a HeNe laser still used a semiconductor
photodetector that was directly mounted on the sled.

Dang, I should have bought one of those old LD players when there were
scads of them in the surplus stores, so I could study how they were
built.
Received on Mon Feb 01 1999 - 20:06:30 GMT