The Mysterious Predicta Network

[Crist Rigott]

Originally Posted by Tim

Crist:

I just recalled that several years ago the late Don Lindsly had sent me information he had copied from 1961 Philco documentation on all the network configurations and part numbers. I have attached it. There is no (A) version listed but it does give the resistor value as 150K used in 30-6509-2. I measured the resistor in 3 NOS "A" networks I have and got 159K, 162K, and 166K.

This seems to indicate that both the non "A" and "A" use a 150K resistor. Maybe the "A" version was a manufacturing change or a higher wattage resistor?

This is a great project you have taken on.

Tim,
Wow, a big thank you for the information. It'll come in handy. I'll use it to double check my work. As a matter-of-fact, I plan on etching the PCB's tomorrow. Your timing was great.

I'm beginning to think the same thing about the -2 and -2A. I think they both use the 150K resistor. Your findings on your "NOS" networks seem to confirm this. My used -2A also ohmed out around 170K IIRC.

Got some homework to do now. Thanks again.