Greetings Ian Besides the lower back pressure advantage of blowing into the anode compartment, this method also cools the tank components. This helps reduce thermal tuning drift in very hi-Q tanks.
On 3/17/2013 4:05 AM, Ian White wrote: On 3/16/2013 11:10 PM, Paul Hewitt wrote: Greetings Ian Besides the lower back pressure advantage of blowing into the anode compartment, this method also cools
Good summary of the actual mechanism of cooling finned anodes in tubes, Ian. I might mention that hams designing with these tubes should always consider the air density where they plan to operate the
I learned this in 1981 when 4CX20,000A/8990 tetrodes in Broadcast Electronics FM30 transmitters would have a darkened center post for filament as the silver tarnished from heat. We applied a thermoco
in every arrl handbook, check it out !! IF you cool the tube in the conventional EIMAC method, you need one helluva lot more pressure when trying to cool tubes like 4CX-250Bs..... vs cooling via the
Good summary of the actual mechanism of cooling finned anodes in tubes, Ian. I might mention that hams designing with these tubes should always consider the air density where they plan to operate the
I do not know of any way to achieve the required air flow at a reduced I believe Emtron and OM both use this approach on some models. in series will indeed increase the pressure, but same CFM. requir
One thing to remember about external anode tubes. They often have cooling requirements listed as so many cfm at a given back pressure, I do not know of any way to achieve the required air flow at a