5670
5670 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $31.73 per tube.
Description
The 5670 is a 9-pin miniature, high-frequency twin triode with a glass envelope, designed for reliable life under intermittent operation.
Construction
The 5670 uses an E9-1 glass button 9-pin base. Its maximum diameter is 7/16 inch, measured from base seat to bulb top line as determined by ring gage, and its maximum seated height is 1.5 inches. The tube can be mounted in any position. It has a coated unipotential cathode. The internal shield and heater are connected to the cathode.
Pinout
The pinout is: pin 1 heater, pin 2 cathode (section 2), pin 3 grid (section 2), pin 4 plate (section 2), pin 5 internal shield, pin 6 plate (section 1), pin 7 grid (section 1), pin 8 cathode (section 1), pin 9 heater.
Ratings and Characteristics
Average characteristics are measured at a heater voltage of 6.3 volts AC. Direct interelectrode capacitances, given without external shield, include plate-to-grid capacitance of 1.3 uuf per section, grid-to-cathode capacitance of 2.2 uuf per section, and plate-to-plate maximum capacitance of 0.10 uuf; plate-to-cathode capacitance per section and plate-to-plate nominal capacitance are also specified. Maximum ratings per triode section are plate dissipation of 1.5 watts and plate current of 18 milliamperes. Maximum heater-cathode voltage is 90 volts.
Typical Class A1 operation values include a plate current of 8.2 milliamperes per section. Typical Class AB1 operation values include a cathode resistor of 800 ohms and a zero-signal plate current of 4.9 milliamperes per section.
| Measure | Per tube |
|---|---|
| Median | $31.73 |
| Typical range (25th–75th) | $18.20 – $39.99 |
| Most sales (10th–90th) | $8.00 – $70.00 |
| Extremes incl. outliers | $5.25 – $75.00 |
| Completed sales | 14 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| GE | $37.89 | $31.23 – $45.58 | 7 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $24.26 | 9 |
Per-tube prices from completed sales, 2026-01-22 to 2026-09-14. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 5670, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| General-Electric | 5670 | PDF (547 KB) |
| RCA (HB3) | 5670 | PDF (371 KB) |
| Tung-Sol | 5670 | PDF (139 KB) |
Documents held here and used to write this page.
- TWIN TRIODE
1 further designation appears alongside 5670 in the literature but below the evidence threshold used here, so it is not listed as equivalent.