Tube Base Application ?

[Troncones]

Is there a comprensive application guide for different materials used for tube bases? There are a lot of different materials available, how do you pick the correct one for the tube/application? Is it tube based? Voltage based? Dielectric properties? My guess all the above, and more.


Thanks

Tom

 

[Soonerorlater]

Hi Tom,
Resistance to melting has to be a good start.

Brgds Bill

 

[HollowState]

There are a lot of different materials available, how do you pick the correct one for the tube/application? Is it tube based? Voltage based? Dielectric properties? My guess all the above, and more.

For transmitting and industrial tubes, it's all the above plus thermal and non-hygroscopic considerations as well as durability. For audio tubes I think it's more price and sonic hypeability. 🙄

 

[boywonder]

Is there a comprensive application guide for different materials used for tube bases? There are a lot of different materials available, how do you pick the correct one for the tube/application? Is it tube based? Voltage based? Dielectric properties? My guess all the above, and more.


Thanks

Tom

Morgan Jones Valve Amps 3rd edition discusses the different materials on page 286. Capacitance and leakage resistance (d) is another parameter with the order being PTFE-ceramic-phenolic.....capacitance ranging from 1.3pf to 1.9pf and leakage (d value) ranging from approx .01 to greater than .1 for ceramic and phenolic. He didn't test PTFE, but commented that it should have even lower leakage than ceramic. The capacitance didn't vary much but the d values were 10:1.