these RTL or what?

[Chuck Guzis]

On 4 Oct 2007 at 1:38, Roy J. Tellason wrote:

> On Tuesday 02 October 2007 09:56, Allison wrote:

> > There are many early families of saturated logic RTL is the oldest,
> 
> Which explains why I was seeing it first,  and hobby-type projects based on it 
> back when.

And in the 60's, logic families were less well-defined.  I still have 
some Fairchild 8-bit addressable memories (TO-100 can) whose 
datasheet claims DTL as the logic family.  +6 for Vcc and...+7vdc for 
clock. 

> I remember one set of 9-pin sockets for which it was apparent to me
> that they were using something like a 12AU7,  because of the
> center-tapped heater connections.  :-) 

I used subminiature tube sockets for my first transistor projects--
they were easier to find than transistor sockets.  Some transistors, 
such as the 2N109 required the use of sockets--they were too 
expensive to solder into a circuit.

Cheers,
Chcuk