morphed to TTL part number history, was: IBM PLAYING

[Scott Stevens]

On Tue, 20 Dec 2005 18:40:31 +0000 (GMT)
ard at p850ug1.demon.co.uk (Tony Duell) wrote:

> > 
> > On 12/20/2005 at 12:10 AM ard at p850ug1.demon.co.uk wrote:
> > 
> > >I recently bought a second-hand Philips 'upright'
> > >reel-to-reel tape  recorder, and found a schematic glued to
> > >the inside of the case. At one  time this was quite common on
> > >consumer electronic devices I believe.
> > 
> > Not at all uncommon on radios and TVs using vacuum tubes
> > (valves).  Very
> 
> Actuallym this tape recorder uses (germanium) transistors. I'm
> still  looking for the mains-powered valved version (EL3514).
> But yes, certainly  a lot of valve radios, etc, had a schematic
> inside
> 

*offtopic*

I also like collecting old tapes.  I have a 'Christmas 1953' tape
from some unknown Indiana family.  Dad had gotten a new tape
recorder and the microphone got passed around to the whole family.
 Dad was obviously an A.V. nerd.

Some of the cheapest, most commmon radios had a schematic inside. 
My Zenith Royal 500 does, and the transistors are even socketed.