4C35

4C35 is also designated 6268.

Description

The 4C35 is a hydrogen thyratron with positive control characteristic. It is described in the Philips datasheet. The tube has a Super Jumbo base with bayonet and uses indirect heating.

Construction and Mounting

The 4C35 may be mounted in any position, with clamping at the base recommended. The tube has a net weight of 200 g and a shipping weight of 850 g. The return lead of the anode and grid circuits should be connected to pin 4.

Ratings and Operating Characteristics

The heater voltage is 6.3 V, with a heater current between 5.5 and 6.7 A at that voltage. The minimum warm-up time is 3 minutes. The anode voltage range is from a minimum of 2.5 kV to a maximum of 8 kV; when applied instantaneously (time of rise min. 0.04 sec), the maximum anode voltage is 7 kV. The maximum anode current is 100 mA, with a maximum anode current during pulse of 90 A. The maximum rate of current rise (dIk/dt) is 1000 A/µsec. The maximum pulse duration (at half amplitude) is 6 µsec. The maximum operating factor is 2x10^9, defined as Vap(V) x Iap(A) x pulse frequency; this applies to pulse repetition rates not far in excess of 2800 pulses per second. The maximum anode time jitter is 0.02 µsec; when measured at 3 kV in a typical circuit, the average anode time jitter is approximately 0.004 µsec. In pulsed operation, the peak inverse anode voltage should not exceed 2.5 kV during the first 25 µsec after the pulse. The maximum rise time is 0.5 µsec. The maximum grid drive circuit impedance (Rg) is 1500 ohms.

Environmental and Handling Notes

The ambient temperature range is -50° to +90° C. No cooling stream of air should be directly applied to the tube envelope. The 4C35 should be kept away from strong fields which could ionise the gas in the tube.

Applications

The 4C35 is intended for service in pulse modulator circuits of microwave radar systems. It is also suggested for use in frequency conversion (high efficiency induction heating), shock excitation of tuned circuits, pulse time modulation circuits, and control circuits.

Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.

Original manufacturer datasheets for 4C35, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• **PHILIPS**
• **AMPEREX ELECTRONIC CORPORATION** (filed under 6268)

1 further designation appears alongside 4C35 in the literature but below the evidence threshold used here, so it is not listed as equivalent.