TimPerry wrote:

Michael A. Terrell wrote:
TimPerry wrote:


This could just be way farout, heavy, trippin, and totally groovy.

Mark


Use a pair of 4CX1500 (or larger) tubes. ;-)

3CX2500F3 even?... problem is the forced air cooling is so noisy.


Not if you build it right. The fans are usually vented outside the
building when used for AM broadcast transmitters. I know of several
stations where the air cooled transmitter is close enough for the
operator to see the meters while they are ion the air, yet you can't
hear them in the control room.

but not IN the studio. the newer solid state stuff is a lot quiter but still
has fans running.

have you noticed that as power amps are now being made bigger and bigger
that there are now speaker systems bening made that claim to handle the
power? for example the peavey QW series.

Sure, they are extremely inefficient. I used some very efficient
music grade drivers and horns back in the '70s that could be heard
clearly over five miles away, with a 65 watt amp. When I built a 70 watt
transistor amp in the late '60s, the largest paper speaker I could find
was 20 watts.

Have you ever seen the insides of one of the Harris digital AM
broadcast transmitters? WQBQ, The last station I visited that had one
in service had a pile of badly damaged output modules from lightning
strikes. I dismantled and moved their original 5 KW Gates BC-5
transmitter to WLBE in leesburg, Florida.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida