I have spoken to RF parts and they claim a 3CX800A7 from Svetlana for $315.00.
However the characteristics of the tube I am speaking of are found below:
It really compares more with a 3CX1200. The gentleman I got this information
from
has told me that these tubes are available all over Europe for around $60.00US
a bottle.
More are available in the old Eastern Block countries, but they are plentiful
at ham fests
in the EU.
THE INFO:
GS31b is a Russian Power triode available on various radio markets
all over Europe for an acceptable price. Compared with an 3CX800A7
this tube is rather cheap and performs quite well. Typical max of
the grounded-grid PA 1.5 kW 1.6-30 MHz, 1.3 kW 50 MHz and 1.1 kW 144
MHz The best is 2.5KV Plate Voltage/750 mA Plate current in 144 MHz!
(The Grid of Tube directly on the chassis, circuit equivalent with
"A 2-kW PEP Amplifier for 144 MHz" Chapter 31-51 of The 1988 ARRL
HANDBOOK, but the cathode with a transistorized zener circuit -
(no regular zener) Power gain of a 144MHz Grounded grid Amplifier
will be around 12dB
Maximum Overall Dimensions
Length : min 143 max 147mm
Anode Diameter : min 99.7 max 100.2 mm
Grid diameter : min 59.5 max 60.3 mm
Cathode Diameter : min 40 max 40.5 mm
Heater Diameter : min 25.6 max 26.2 mm
Electrical Characteristics
Heater is AC 12-13.2 V / 3.1-3.7 A; Typical is 12.6 V / 3.4 A
Plate Dissipation 1000 W
Plate Voltage up 3000 V
Plate current 1000 mA (max 1.4 A/30sec)
Plate Temperature 200 degrees Celsius max!
Grid Temperature 120 degrees Celsius
Cathode Temperature 120 degrees Celsius
Required Air flow 100 l/min
Grid Voltage min -200 max 0 V
Grid current 50 mA (max 100 mA)
Grid Dissipation 22W
FQ max 1000 MHz
C (g-p) 3.8-5.2 pF
C (g-c) 19-24 pF
C (c-p) 0.12 pF
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