Re: Vintage Television Technology.
Excellent post Synchrodyne.
Reading the USA magazines the 6AF4 tended to have a short life, the 6AF4A was developed to make the valve more reliable. It appears that the valve had to work at it max potential for the tuner to work.
The European PC86/88 were not that great on reliability or performance but in the USA case and European, circuits had to be designed on what components were available.
Thank you for taking the time to write it all up.
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Frank
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