5U4GB
5U4GB has no equivalent designation confirmed by the archive. Completed sales put the typical price at $18.24 per tube.
The 5U4GB is a full-wave vacuum rectifier tube.
Construction
The 5U4GB has a coated filament rated at 5 volts and 3 amperes. The basing designation for bottom view is 5T. Pin 2 is the filament, pin 8 is the filament, and pins 6 and 4 are plate No. 1 and plate No. 2 respectively.
Ratings and Operating Conditions
The maximum peak plate current per plate during hot-switching is limited to 4.6 amperes. The tube voltage drop at a load current of 174 mA is 55 volts. The dc output voltage at input to filter is approximately 340 volts at a full-load current of 348 mA, and approximately 355 volts at a half-load current of 174 mA. Typical operation with a choke-input filter includes an AC plate-to-plate supply voltage of 900 volts RMS and a filter-input choke of 10 henries.
Mounting
The operating position can be vertical with base down or up, or horizontal with pins 1 and 4 in a vertical plane.
| Measure | Per tube |
|---|---|
| Median | $18.24 |
| Typical range (25th–75th) | $10.97 – $30.08 |
| Most sales (10th–90th) | $8.09 – $51.24 |
| Extremes incl. outliers | $1.91 – $590.00 |
| Completed sales | 320 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $22.72 | $12.97 – $33.19 | 102 |
| Sylvania | $18.24 | $11.00 – $25.78 | 48 |
| GE | $13.44 | $10.94 – $22.95 | 44 |
| Tung-Sol | $27.92 | $18.45 – $57.48 | 22 |
| Raytheon | $15.70 | $8.85 – $26.24 | 15 |
| JJ | $43.23 | $24.99 – $43.23 | 10 |
| Philips | $44.09 | $34.20 – $53.99 | 4 |
| Westinghouse | $24.00 | $8.63 – $27.98 | 3 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $25.88 | 156 |
| used | $13.41 | 130 |
| current | $32.73 | 14 |
Per-tube prices from completed sales, 2026-04-21 to 2026-10-09. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 5U4GB, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| RCA (HB3) | 5U4GB | PDF (878 KB) |
| General Electric | 5U4GB | PDF (463 KB) |
| Tung-Sol | 5U4GB | PDF (196 KB) |
Documents held here and used to write this page.
- SUN CB **FULL-WAVE VACUUM RECTIFIER**