[Amps] Chimneys for Russian tubes

[Paul Whatton <paul.whatton@ntlworld.com>]

Hi all, I'd appreciate some advice.

I'm building an amp with a pair of GI-7bs and will be blowing into the 
anode compartment and using two PTFE chimneys in the usual (K2RIW) way 
venting out of the top of the case. But because the Russian tubes have 
open sided anode fins I wondered if it would be better to take the PTFE 
chimney right down to the bottom of the cooler, thus creating a tunnel, 
or only part way down the fins to allow some air flow through the sides 
as well? The latter would certainly appear to help where the underside 
slots in the fins are obstructed by the tank circuit bracket, but how 
about all round?

Your thought much appreciated.

73

Paul G4DCV

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