Hi Jim, I have been trying to reply but keep getting diverted.

One problem is understanding the definition of a “big pin” tube. How big is “big”? ?I can find no definition. the 4,6,and older 7

Ing tubes have two ?0.156 ?[5/32?] inch pins and some .125 [1/8]inch pins but the 5 pin tube has only the smaller pins.

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Anyhow, I googled with “what is? a "big pin" radio tube?” ????and AI replied as follows”

AI Overview

A "big pin" radio tube, also known as a vacuum tube or electron tube, is a type of electronic device that uses the flow of electrons in a vacuum to control electrical signals, often used in older radio and audio equipment.?

Here's a more detailed explanation:

• What it is:

A "big pin" radio tube is a type of vacuum tube, a device that uses the flow of electrons in a vacuum to control electrical signals.?

·? ·? How it works:

Inside the tube, a heated filament (cathode) emits electrons, which are then controlled by a grid (a metal mesh) and attracted to a positively charged plate (anode).?

·? ·? Why it's called "big pin":

The term "big pin" likely refers to the size and shape of the base or connector pins on the tube, which are larger than those on smaller tube types.?

·? ·? Examples:

Some common "big pin" tube types include the 6L6, 6V6, 6K5, and 6C5.?

·? ·? Historical Context:

Before the advent of semiconductor devices, vacuum tubes like these were widely used in various electronic applications, including radios, audio amplifiers, and television sets.?

·? ·? Modern Usage:

While largely replaced by transistors and other solid-state devices, vacuum tubes are still used in some applications, particularly in audio amplifiers and specialized electronic equipment where their unique sound characteristics are desired.?

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More stuff later.

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