40 volts across 2k is about 1 watt.
without the front end board you will need about 3 or 4k in which case 2 or 3 watts.
Antek are cheap, robust, quiet and produce more than their spec's
So going to try two 500va
if using parallel winding's keep voltages within .2V to prevent eddy currents
9/29/16
measured gain with 4k Rf
+-25v bench supply @1A bias
one channel at a time (single-ended)
sine wave input direct to driver boards
300mv in = 2v out
all measurements RMS
Gain 6.6 which would require 5.5v for full output
with 2k Rf gain was about 5
Alloy: 6063-T6Width: 7.280"
Fin Height: 1"
Base: .300"
C/W/3": approximately 1.30
Weight per Inch: .37
11"/3=3.66 1.3C/W/3.66=.35C/W
25C above ambient 25/.35=71Watts
double that for fan cooling or so
110mv bias is 75W per board
200mv is 136W dissipation and 46W class A Peak
output boards
The To-264 transistors stick out above the board .150"transformers
Transformers are the hardest thing for me.Antek are cheap, robust, quiet and produce more than their spec's
So going to try two 500va
if using parallel winding's keep voltages within .2V to prevent eddy currents
9/29/16
measured gain with 4k Rf
+-25v bench supply @1A bias
one channel at a time (single-ended)
sine wave input direct to driver boards
300mv in = 2v out
all measurements RMS
Gain 6.6 which would require 5.5v for full output
with 2k Rf gain was about 5
HeatSink
Extruded Aluminum HeatsinkAlloy: 6063-T6Width: 7.280"
Fin Height: 1"
Base: .300"
C/W/3": approximately 1.30
Weight per Inch: .37
11"/3=3.66 1.3C/W/3.66=.35C/W
25C above ambient 25/.35=71Watts
double that for fan cooling or so
110mv bias is 75W per board
200mv is 136W dissipation and 46W class A Peak
First Test 3-2-16
running on 3a bench supply at + - 20v
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