6BT4
6BT4 is also designated EZ40.
Description
The 6BT4 is an indirectly heated full wave rectifier with a coated unipotential cathode and a glass bulb.
Construction
The base is type E8-30. The maximum overall length is 3-3/16 inches (81 mm), the maximum seated height is 2-29/32 inches (74 mm), and the maximum diameter is 7/8 inch (22 mm). The tube may be mounted in any position.
Ratings
The heater requires 6.3 volts at 0.6 amps. Pin 1 and pin 8 connect to the heater, pin 2 connects to plate No. 1, pin 6 connects to plate No. 2, and pin 7 connects to the cathode. The maximum alternating input voltage for each half is 350 volts RMS, and the tube delivers a maximum of 90 mA D.C. The maximum first capacitor of the smoothing filter is 50 μF, and the peak voltage between cathode and heater is 500 volts. The Brimar datasheet gives these maximum ratings as design centre values.
| Designation | Evidence | Confidence |
|---|---|---|
| EZ40 | 44 independent documents | confirmed |
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 6BT4, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Philips | 6BT4 | PDF (71 KB) |
| Philips | EZ40 | PDF (277 KB) |
| Philips | EZ40 | PDF (75 KB) |
Documents held here and used to write this page.
- EZ40 (filed under EZ40)
- MAXIMUM RATINGS (Design centre values)
3 further designations appear alongside 6BT4 in the literature but below the evidence threshold used here, so they are not listed as equivalent.