[Amps] tube cooling requirements

[Jim Kearman]

From: "peter.voelpel" <df3kv at t-online.de>

> 
> when using tubes in parallel, how are the cooling requirements?
> Do the data sheet values for cfm and back pressure have to be doubled
> or just the cfm value?

Peter,

Think of it as an Ohm's Law problem, with parallel resistors. If you have one resistor and a certain requirement for current flow through it at a specified voltage, when you add a second parallel resistor the total current required from the power supply is doubled. CFM is the amperage, back pressure is the voltage. You need twice the CFM at the same back pressure.

73,

Jim, KR1S
http://kr1s.kearman.com/