Project Betty.
A linear amplifier project that will no doubt take considerable time to complete. Start date March 2008
The picture below shows a transformer wound by Harrison & Greenwood.
Specification:
3600v @ 3.2amp 100% duty. Complete with adjustable soft-start
The smaller transformer is 15v @ 15a 100% duty.
The smaller transformer was easy to move from the garage, I've yet to figure out how to move the larger one as it is about 110kg!
The picture above shows the amplifier main high voltage transformer, plus the tube heater transformer. In July 2009 I managed to move the unit from the garage and it is now in the shack, next to the cabinet it will live inside.
Here's the cabinet:
I acquired this from my old works QTH, it used to house the sites CCTV equipment, but it became redundant on the system upgrade, so it ended up as mine rather than be dumped.
This next picture shows the PSU smoothing bank, it consists of FOUR 5kv 40uF caps, they will be assembled to give me 40uF @ 10KV, so I will have plenty of headroom rather than run the caps flat out at their rated value.
Next, the rest of the PSU section, this is a 10KV 5amp diode, I will be using 4 of them in a classic bridge for my DC
Here's part of the anode compartment:
and again
The panels have been cut using high pressure water jet rather than laser. The result give the edge of each plate what looks to be a crystalline finish.
Here's the tune capacitor, a 500pF vacuum variable by Jennings rated at 15KV
And for now... the final picture is the blower:
The blower is adjustable via electronic control and can deliver up to 350M3/Hr, although I don't need that much so I'll be backing the air flow off a little.
73
Andy GD0TEP
high power linear amp using valves
Linear Amp UK modifications
GS35b on 50mhz
fitting an amplifier with a muffin fan
gs-35b heat sink
BLOWER FOR AMPLIFIER