"Nick Gorham"

Here is a link to some pictures of the GM70 amp that I have been working
on for the past eight months.

http://www.lurcher.org/nick/images/gm70/

Circuit is a C3g Pentode voltage amplifier with VR tube screen regulator,
then 300b driver to 1:1 amorphous interstage to GM70 grid. Output TX 7k
amorphous. Driver and 300b supply, series regulator using 6080, ecl82 and
0d3 (Steve Bench inspired). TJ-Meshplate 300b, running 330v @ 55ma. Copper
plate GM70 running 1020v @ 110ma.



** The GM70's heater is rated for 20 volts at 3 amps - means it
dissipates 60 watts, mainly by radiating it to the surrounding plate
structure. The plate dissipates 112 watts on its own - adds up to around
170 watts.

So the tube glows red all the time - right ?





....... Phil