For minimum airflow resistance for a forced air cooled amplifier it would seem the blower needs to discharge in a straight line directly into the underside of the valve socket. This leads to a fairly
For minimum airflow resistance for a forced air cooled amplifier it would seem the blower needs to discharge in a straight line directly into the underside of the valve socket. This leads to a fairl
I believe the air system socket connected to a duct is especially useful when you can't have a pressurized cabinet. There are situations where large cabinets are used and sealing them is not possible
On 3/15/2013 10:09 PM, Bill Fuqua wrote: I believe the air system socket connected to a duct is especially useful when you can't have a pressurized cabinet. There are situations where large cabinets
What is the "right" way to make the physical connection between blower and air system socket? Rigid ducting? Something resilient like rubber? Or (what intrigues me) how about a fabric transition duct
I *think* I have read (here?) that there is a big difference between the physics of pressurized and unpressurized systems in this respect. Is there anyone out there who understands this and can comme
the physics of out there There is a big difference in cooling efficiency between the turbulent air that comes directly out of the blower, and the same volume of smooth flowing air coming out of a lo
Very interesting concept, Ian. I'm wondering how the 25-30% downward flow past the filament pins is adjusted? Presumably one needs to size an outside vent on the underchassis to exhaust that air. Als
If youre building from scratch then Id think you would make the effort to accomodate the cooling system from the beginning. Use a subchassis for the tube that is easily pressurized (Ameritron will se
How big does the pressurized subchassis have to be to smooth out the airflow? My amp under construction (4cx1000a) has the socket in a 7x7x2 inch box with the blower pushing air into the side. Too sm
It all depends upon the blower cfm/backpressure rating and the socket plus tube contribution. If you look at the Ameritron bases they are not very large or look at the various Alpha 8874 amps which a
This technique (below) is used in a lot of air cooled cavity amplifiers, esp of the broadcast FM style. The Eimac SK300A socket has too much openness to offer effective isolation between input and ou
flow past vent on why the back flow up impedance. The vents from the vents pressure that the somebodly air flow. This system. to give opinion) plate Unfortunately, the causes hence, decrease Sorry,
Greetings Ian Besides the lower back pressure advantage of blowing into the anode compartment, this method also cools the tank components. This helps reduce themal tuning drift in very hi-Q tanks. 73
I like to use conventional cooling. BUT with the blower mounted inside of the amplifier compartment. With strategically placed intake holes, I achieve cooling of the tank and caps where I think it's
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 the tank components. This helps reduce
That is also true - the complete opposite of layouts like the Dentron DTR-2000 where the 8877 blasts HOT air at the tank circuit. cooling back making it a Back to physics. The only fundamental requi
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 the tank components. This helps reduce
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. 7