6FG6
6FG6 is also designated EM84. Completed sales put the typical price at $20.00 per tube.
Description
The 6FG6 is an indicator tube with an amplifying triode, intended for use as a tuning indicator or for modulation control. It has a coated, unipotential cathode.
Construction
The Rogers datasheet describes the 6FG6 as having a T6 1/2 envelope and an E9-1 base. The mounting position is any.
Ratings
The heater is rated at 6.3 volts and draws 270 mA. The maximum voltage between heater and cathode is 100 volts. The triode plate dissipation is 0.5 watt maximum, and the cathode current is 3 mA maximum. The triode grid circuit resistance is 3 megohms maximum. The deflection electrode voltage is 300 volts maximum, or 550 volts maximum without current. The target voltage is 300 volts maximum and 150 volts minimum, or 550 volts maximum without current. The maximum bulb temperature is 120 °C.
| Designation | Evidence | Confidence |
|---|---|---|
| EM84 | 74 independent documents | strong |
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.
| Measure | Per tube |
|---|---|
| Median | $20.00 |
| Typical range (25th–75th) | $17.49 – $26.88 |
| Most sales (10th–90th) | $15.50 – $28.80 |
| Extremes incl. outliers | $11.36 – $29.45 |
| Completed sales | 20 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| Sylvania | $20.00 | $20.00 – $26.07 | 3 |
| Philips | $28.80 | $24.39 – $28.80 | 3 |
| RCA | $14.25 | $11.36 – $19.98 | 3 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $23.19 | 14 |
| used | $19.98 | 5 |
Per-tube prices from completed sales, 2026-07-04 to 2026-09-24. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6FG6, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Rogers | 6FG6 | PDF (91 KB) |
| Tesla | EM84 | PDF (326 KB) |
| Mazda-Belvu | EM84 | PDF (241 KB) |
| Philips | EM84 | PDF (151 KB) |
| La Radiotechnique | EM84 | PDF (67 KB) |
| Philips | EM84 | PDF (56 KB) |
Documents held here and used to write this page.
- MINISTERSTVO PŘESNÉHO STROJÍRENSTVÍ (filed under EM84)
- Rogers Electronic Tubes & Components
5 further designations appear alongside 6FG6 in the literature but below the evidence threshold used here, so they are not listed as equivalent.