7236 — Power Triode, Octal | Tubeofile

7236

Power Triode — Octal

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Tung-Sol

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Known Equivalents & Substitutes

5998A6080WB

Similar Tubes (Not Drop-In Compatible)

5998

Same Octal pinout and similar characteristics but different ratings (µ=5.4 vs 4.8, Va_max=250V vs 300V) — close but not identical

6080

Same Octal pinout but lower mu (2.0 vs 4.8) and lower max plate voltage (275V vs 300V) — functional substitute in many applications but not electrically identical

6AS7G

Same Octal pinout but lower mu (2.0 vs 4.8) and different ratings — works in many circuits but operating point shifts significantly

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)300V

Anode Dissipation (max)Anode Dissipation (max, per plate)15W

Cathode Current (max)Max Plate Current Per Plate190mA

Heater-to-Cathode Voltage (max)Max Heater-Cathode Voltage100V

Notes

The 7236 has poor heater-to-cathode insulation compared to other regulator-family tubes (6AS7, 6080, 5998, 6528). Some specimens break down at 150 V Vhk. Use caution in circuits with elevated cathode voltages.
Often described as a 'computer-rated 5998' but differs electrically: lower mu (4.8 vs 5.4) and lower gm (12,500 vs 15,500 micromhos) than the 5998, with a higher max plate voltage (300 V vs 250 V).
5998A is the direct equivalent (same ratings). The 5998 (non-A) and 421A have similar pinout but different ratings — not drop-in equivalents.
The 6AS7/6080 family shares the same pinout and heater but has significantly lower mu (2.0) and max plate voltage (250–275 V). Substitution works in many circuits but operating point will shift.
Forced air cooling is necessary to stay within the 150°C maximum bulb temperature rating.

Pin Layout — Octal

1Grid (Section 2)

2Plate (Section 2)

3Cathode (Section 2)

Socket-Compatible Tubes ⚠ Not electrically compatible

12SN7WGT 12SX7 13D1 1633 5998 6080 6336B 6528 6AS7 6BX7 6DN7 6EM7 6H13C 6N13P 6N5S

References