This 1974 magazine uses general purpose parts to design and build circuits. A reader could build the circuits with whatever they had on hand and not be trying to locate and buy parts specified in the magazine.
It is a good plan so I'm posting the article. The names are a little strange and it doesn't allow for Germanium transistors but it is a start.
I use this ohmmeter test but use a 1K resistor.The skin resistance can vary quite a bit. The 1K resistor gives repeatable results.
A sample circuit from the same source.
The amps I've been building have been using Germanium transistors. I've used GSS109, MP40, MP16, MP39 and P416 with good results.
It is a good plan so I'm posting the article. The names are a little strange and it doesn't allow for Germanium transistors but it is a start.
I use this ohmmeter test but use a 1K resistor.The skin resistance can vary quite a bit. The 1K resistor gives repeatable results.
A sample circuit from the same source.
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