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7189A — Power Pentode, Noval | Tubeofile

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7189A

Name: 7189A
Brand: GE

Power Pentode — Noval

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GEData: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

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Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

6BQ5

Same tube as EL84 — same pinout, lower ratings than 7189A

6GK6

Similar power pentode but different Noval pinout — not a drop-in

7189

Lower-rated version with same Noval base and pinout — can substitute in circuits within 7189 ratings

EL84

Same Noval base and pinout but lower max ratings — the 7189A has higher Va_max and Vs_max. An EL84 can substitute at reduced ratings.

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)400V

Screen Voltage (max)Screen Voltage (max)325V

Anode Dissipation (max)Anode Dissipation (max)12W

Screen Dissipation (max)Screen Dissipation (max)2W

Cathode Current (max)

Notes

The 7189A is a selected, higher-rated version of the EL84/6BQ5 family. It can operate at higher plate and screen voltages.
Same Noval base and pin configuration as EL84/6BQ5 — physically interchangeable, but the 7189A is rated for higher voltages.
Used in higher-powered versions of EL84-based amplifiers, such as the Fisher X-100 and Scott 222.
Brans Vademecum lists equivalents including 6BQ5, 6GK6, 8BQ5 — these are functional equivalents at their respective lower ratings, not true replacements at 7189A ratings.
Grid 1 circuit resistance: 0.3 MΩ max for fixed-bias, 1 MΩ max for cathode-bias operation.

Pin Layout — Noval

1No Connection

2Control Grid (g1)

3Cathode

References

https://tdsl.duncanamps.com/show.php?des=7189A

Cathode Current (max)

65mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)100V

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)300V

Screen Voltage (typical)Screen Voltage (typical)300V

Grid 1 Bias VoltageGrid 1 Bias Voltage-9.5V

Anode CurrentAnode Current48mA

Screen CurrentScreen Current5.5mA

Anode ResistanceAnode Resistance38,000Ω

TransconductanceTransconductance11.3mA/V

Output

Output PowerOutput Power6.5W

Load ImpedanceLoad Impedance3,800Ω

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.76A

4Heater

5Heater

6No Connection

7Anode

8No Connection

9Screen Grid (g2)