This is
the home made cabinet of the BA320 cabinet with all the modules removed.
If I had
any sense I would have taken a new set of photos of each module when I
had them out but
I didn't!
| The modules
are from bottom up:
1: 1400
volt power supply
2:
Modulator with class AB1 813's
3:
Control and meter panel
4:
Exciter unit
5: Dual band PA with single
class C 813.
|
The
top two units - the RF PA with the single class C 813 and the two
band exciter.
To
change bands just turn the knobs to yellow for 40M or blue for 10M.
Then just carefully tweak it up.
The PA unit with the 813
This
is an early photo, before the modifications to make it a two bander.
Exciter
unit of the BA320
This
is an early photo, before the modifications to make it a two bander.
Tube
line-up: 12BY7 multiplier, 2E26 multiplier, 2E26 driver
This is
the Control and Meter unit - the meters indicate Grid Drive, Screen
Current and Plate Current. This unit was not painted because it has to
be taken out of the transmitter. Too hard!
If it ever fails and has to come out, then I will paint it. This unit also has
the screen over voltage protection (4 x VR150's in series and a bias
regulator (1 x VR150)
The 150
watt modulator with two 813's in class AB1. It has clipping and
filtering built in but I vey rarely use this feature.
I think
that clean audio is better than using clipping and filtering.
Tube
line-up: EF86 speech amp, 6SL7, 6SN7, 6H6, 6SN7, 2 x 813
The modulator unit
The
modulator of the BA320 - a pair of 813's glowing
like the setting sun
|
