The 6AQ5A is a controlled heater warm-up version; the 6AQ5W/6005 is the ruggedised military variant. All share the same pinout and are drop-in replacements within their respective voltage ratings.
Rg_max differs by bias type: 0.1 MΩ for fixed-bias operation, 0.5 MΩ for cathode-bias operation (RCA datasheet).
Tung-Sol datasheet specifies Va_max = 275 V and Vs_max = 275 V for Class A1 amplifier service. RCA datasheet specifies 250 V for both. The Tung-Sol values with arrow notation indicate a change from previous ratings. The more conservative RCA ratings are used here for max values.
Pin 1 and Pin 7 are both connected to Grid No.1 (control grid) — dual grid pins reduce lead inductance for improved high-frequency performance.
Triode-strapped data from the Tung-Sol manufacturer datasheet. Schlangen (2009) independently measured similar values: μ=10, gm=5.0 mA/V, rp=2.0 kΩ.
RCA notes that curves for the 6AQ5-A are the same as those shown for the 6V6, underscoring the close electrical similarity between the two types despite different package formats.