Name: TH558 equivalent RS2078SK, 4CM500000G high-power cermet quaternary tube, transmitter tube, tetrode TH 558, used as continuous wave oscillator
Brand: China industrial electronic components
SKU: ETT02024
Availability: InStock

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USED IN THE FOLLOWING SHORTWAVE BROADCAST TRANSMITTERS
Manufacturers	Transmitters	Power
Ampegon	TSW2300D	300 KW
Continental Electronics	420B / 420C	500 KW
Marconi	B6133	250 KW
Marconi	B6127 / B6128 / B6128S	500 KW
Hitachi Kokusai Electric	TA-3001	300 KW
RIZ Transmitters	OR250K-02/A	250 KW
RIZ Transmitters	OR300K-02/A	300 KW
RIZ Transmitters	OR500K-01/A	500 KW
Telefunken	S4005	100 KW
Thales	TSW2250	250 KW
Thales	TSW2300	300 KW
Thomson	TRE2335	300 KW
Thomson	TRE2352 / TRE2355	500 KW
Thomson	TSW2250D	250 KW
Thomson	TSW2300D	300 KW

For fast delivery of goods, kindly please read following tips carefully before order:

300KW, 500KW, two powers available, optional

Since this tube is high value and Customs declarance necessary,
for compliance with China foreigh exchange policy.

the Payment need to be paid through TT to our company bank account,
therefore, please DO NOT pay the order directly online.

please contact EECTECH through sales@eectech.store BEFORE order / BEFORE payment, we will help you to complete the order and payment fluently in a short time. Thank you.

Introduction:
1. The TH558 high-power cermet quaternary tube adopts a meshed thorium-tungsten cathode, a pyrolytic graphite grid, and a coaxial electrode structure.
2. The tube can be used as a continuous wave oscillator, and can also be used for AF and RF power amplifiers. The operating frequency can reach 50MHz, and the shortwave output power can reach 550KW.

1 General Characteristics
1.1 Cathode Characteristics
Heater supply.................. 23V/500A
1.2 Feature Characteristics
Amplification Factor................ 3.7~4.9
Transconductance (Ia=10/15A, Ug2=1000V) ..................180mA/V min.
Cathode－Control-grid ................450 pF
Control-grid－Screen-grid............. 750pF
Screen-grid－Anode.................. 100 pF
2 Maximum Ratings
Anode Voltage Ua 15 kV
Screen-grid DC Voltage Ug2 1250 V
Control-grid DC Voltage Ug1 －1000 V
Peak cathode current Ia 600 A
Control-grid Dissipation Pg1 3 kW
Screen-gird Dissipation Pg2 8 kW
3 Typical Application
Frequency f 26 MHz
Output power Pout 550 kW
Heater voltage Uf 20.5 V
Anode voltage Ua 12.5 kV
Screen-grid dc voltage Ug2 1100 V
Control-gird dc voltage Ug1 -500 V
Anode dc current Ia 54 A

For delivery time:
Generally, we will dispatch the items within 30 days upon order confirmation; some items may need 60~90 days to get ready for delivery, then we will try our best to dispatch as soon as possible, or we will contact you and offer advice.

For Bulk order:
If you would like to place a bulk order, please contact us for better price and better delivery cost.