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Power transmitting air-cooled vacuum tubes

  

For vacuum tubes customers assistance  is of charge.

Maximum transmitting device ratings (maximum potential capability): class - B (non-linear);  conduction angle - 90є;  efficiency - 65%
 
Tube Type FRQ (max) Dissipation (W) P inp. (W) P out. (W) Price (EUR)
GI-7B Ceramic-metal triode λ=10cm 350 1000 650 29
GI-21B Ceramic-metal triode λ=8.5cm 110 314 204 10
GS-15B Ceramic-metal tetrode λ=30cm 200 572 372 22
GS-23B Ceramic-metal tetrode 1000MHz 1500 4286 2786 N/A
GS-35B Ceramic-metal triode 1000MHz 1500 4286 2786 N/A
GS-36B / 4CX400A Ceramic-metal triode 500MHz 400 1140 740 N/A
GU-33B Glass-metal tetrode 500MHz 150 429 279 19
GU-34B Glass-metal tetrode 250MHz 650 1857 1207 N/A
GU-35B Glass-metal tetrode 250MHz 3500 10000 6500 N/A
GU-43B Glass-metal tetrode 100MHz 1000 2857 1857 77
GU-47B Glass-metal tetrode 100MHz 6000 23143 17143 N/A
GU-73B Ceramic-metal tetrode 250MHz 2500 7143 4643 N/A
GU-74B / 4CX800A Ceramic-metal tetrode 250MHz 600 1714 1114 89
GU-78B Ceramic-metal tetrode 250MHz 2500 7143 4643 N/A
GU-81 Glass pentode 50MHz 450 or 600 for3min 1714 1114 N/A
GU-84B / 4CX2500A Ceramic-metal tetrode 250MHz 2500 7143 4643 N/A


 The efficiency of the tubes in class "AB1" -"AB2" are about 35% - 63%. It depends on the condition angle of the anode current. The choosing of the condition angle depends on anode-grid graphical characteristics (whether linear or non-linear mode of amplifier is chosen) and on other parameters of the tube including schematic of amplifier (grounded grid or grounded cathode and etc.). Zero-signal current for cathode grounded amplifier is very critical for intermodulation distortion and can be defined using  graphical  characteristics of the tube. Zero-signal current for grid grounded tube is not critical and can be less in 5 - 10 times than for cathode grounded tube due to about 6 db of positive feedback providing by grounded grid schematic automatically.

Real efficiency of amplifier includes efficiency of Pi or Pi-L inductor.
As a rule real efficiency of inductor is 50% - 86% on 30MHz and 86% - 93% on  1.8MHz. - 20MHz.  It depends on type of inductor, frequency, construction  features and influence of metal details to inductor.

The highest quality tubes are produced and intended  for Army . Other quality tubes could be obtained by any users for various purposes, not for transmitters only. For example: for various oscillators of the factory processes  etc.  
The tubes which are offered from this web have never  used & new. They are high quality tubes  from the Army stocks.
 Tube sockets
Description

View

Price (EUR)
ID: SK1-A
GU-74B / 4CX800A (SK1-A) socket  has built-in screen  bypass capacitor for HF/VHF  		35
ID: SK1-A2
GU-74B / 4CX800A (SK1-A) socket  has built-in screen  bypass capacitor for HF/VHF  		33
ID: SK1-A+CH
GU-74B / 4CX800A  (SK1-A) socket  has built-in screen  bypass capacitor for HF/VHF + teflon chimney		 N/A

ID: GS36B+CH
GS-36B / 4CX400 coaxial  socket  has built-in screen  bypass capacitor for HF/VHF + teflon chimney
 		 39
ID: GI7B-ST
GI-7B sockets (used, in good condition)		 37
ID: GU43B-ST
GU-43B / GU-34B socket  has built-in screen  bypass capacitor for HF/VHF 
(Ceramic chimney)		 N/A
ID: GU43B-SC
GU-43B / GU-34B socket  has built-in screen  bypass capacitor for HF/VHF, similar as for SK1-A
(Ceramic chimney)		 N/A
ID: GU84B-ST
GU-84B socket  has built-in screen  bypass capacitor for HF/VHF 
(Ceramic chimney)		 139

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