45B5

45B5 is also designated UL84.

Description

The 45B5 is a power pentode with a coated unipotential cathode. It uses an E9-1 base and a T61/2 bulb, with a maximum bulb diameter of 7/8 inch. The tube may be mounted in any position. Its RETMA basing designation is 9CV.

Ratings

The heater is rated for 45 volts at 100 milliamps. Maximum ratings include a plate voltage of 250 volts (or 550 volts with no plate current), a plate dissipation of 12 watts, and a grid No. 2 voltage of 200 volts (or 550 volts with no grid No. 2 current). Grid No. 2 dissipation is limited to 1.75 watts, with a peak of 6 watts. Maximum cathode current is 100 milliamps, and maximum heater-to-cathode voltage is 200 volts.

Characteristics

Typical operating values are given for transconductance (9000 to 10000 micromhos), plate resistance (23000 to 28000 ohms), and an amplification factor of grid No. 2 with respect to grid No. 1 of 8. Maximum interelectrode capacitances are 0.25 μμF for grid No. 1 to heater and 0.6 μμF for plate to grid No. 1.

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 45B5, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• UL84 (filed under UL84)
• 45B5

2 further designations appear alongside 45B5 in the literature but below the evidence threshold used here, so they are not listed as equivalent.