6Z5

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• JEDEC base 6K — a unique small 6-pin pre-octal base used on a handful of 1930s RCA/Majestic replacement types. There is no standard catalog base entry for 6K in this repo (not the same socket as Octal/6S or UX6), so `base` is left null. This is NOT an Octal socket and CANNOT be substituted into an Octal or UX6 socket without rewiring.
• Split heater: two 6.3 V/0.4 A filament sections brought out separately. Wire in series across pins 2 and 6 for 12.6 V/0.4 A operation, or connect pin 1 (mid-tap) to pins 2 and 6 together for 6.3 V/0.8 A parallel operation. This is the defining feature of the 6Z5 vs other 6 V rectifiers.
• Datasheet does NOT state peak inverse voltage or forward voltage drop as discrete numbers. PIV recorded here (700 V) is a conservative derivation: peak inverse across the non-conducting diode in a full-wave circuit is 2·√2·Vrms_per_plate = 2.83 × 230 ≈ 650 V; rounded up.
• Vdrop (22 V at 60 mA) is an estimate from 60 mA-class siblings (type 84/6Z4 at 20 V, 6X5 at 22 V @ 70 mA). The RCA datasheet gives no explicit value and no plate I/V curve from which to derive one, and the curated six-volt rectifier reference table also has no entry — so this value is a reasoned engineering estimate, not a primary-source measurement. Treat as approximate.
• Renewal type for Majestic receivers — uncommon outside that context, and largely displaced by the 6X5 family by the 1940s.

• http://www.tubebooks.org/tubedata/HB-3/Receiving_Tubes_Part_2/6Z5.PDF
• https://www.radiomuseum.org/tubes/tube_6z5_1.html