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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an
Special page devoted to
Practical Photos for P.A. on Tube GU-43B
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ANTENTOP- 01- 2010, # 012 |
Practical Photos for P.A. on Tube GU-43B |
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Nikolay
Kisel, UA3AIC, mailto: ua3aic@mail.ru |
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Photo
# 1. The photo shows circuits for first
(right) and second (left) grids. It is possible to see (under tube
socket red
resistor- 56- Ohms, anti- self-excitation. Value may be increased
to 100- Ohm at some cases. Choke for heater circuit is wound on
a ferrite ring (permeability does not matter). Wire for each heater
terminal is placed on the one half of the ring. Photo #2. Circuit of
the second grid is shown on the photo. At "hot" end:
Red capacitors- 0.01-microF- 4 pcs, Blue capacitor- 6800- pF-
1-pcs, Red resistors 56- kOhm -2-Wtts (to eliminate dynatron effect at the second
grid). Thereof it is Choke (yellow one) and resistor 100- Ohm-
5-Wtts for limiting current of the second grid. Between the choke
and resistor there are capacitors 1.0- microF,
and some mica capacitors for shortening RF. |
Photo # 1 |
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Photo #2 |
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Last Updated:
January 22, 2020 22:24
