Quoted from o-din:We just take all the tubes down to the electronic store and plug them into the tube tester. Whichever ones are bad we replace and that usually fixes the problem.
I remember those days. I am glad for those that are younger and never had to experience such unreliability.
I also remember the numerous times we were stuck in a parking lot of a local store while my father worked on getting the car to start.
Thank goodness for fuel injection replacing carburetors and other misc. improvements. Even cars between 10 and 15 years old today are more reliable than 5 year old cars back then.