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47 A 8 Tube Socket Adapter

$7.50
47 A 8 Tube Socket Adapter
47 A 8 Tube Socket Adapter

Home / Shop

47 A 8 Tube Socket Adapter

$7.50
Model Number: 47A8PIN
8-pin tube adapter converting 12SA7 octal sockets to accept 7A8 loctal pentagrid converter tubes without modifying radio wiring.
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7.500
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99 Left in Stock
Maximum purchase amount of 4 is allowed
Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

This 8-pin tube socket adapter allows the direct substitution of a 7A8 loctal pentagrid converter tube in place of a 12SA7 octal converter without chassis rewiring. Engineered with an octal base plug on the bottom and a loctal socket on top, it remaps internal pin connections to convert filament, grid, plate, and oscillator leads. It is ideal for vintage radio restoration in sets from Zenith, Philco, and RCA Victor when original 12SA7 octal tubes are unavailable. Available in new production and vintage adapter styles.

  • Adapter Type: Octal-to-Loctal Tube Converter

  • Base Plug (Bottom): 8-Pin Octal Plug (Fits standard 12SA7 chassis socket)

  • Top Socket: 8-Pin Loctal Socket (Accepts 7A8 loctal tube)

  • Target Tube Substituted: 12SA7 (Pentagrid Converter)

  • Replacement Tube Used: 7A8 (Loctal Pentagrid Converter)

  • Contact Material: Phosphor Bronze / Nickel-Plated Contacts

  • Body Material: Molded Phenolic / Bakelite

  • Wiring Pinout Remap:

    • Pin 1 (Shell/Shield) - Loctal Center Key / Shield

    • Pin 2 (Heater) - Pin 1 (7A8 Heater)

    • Pin 3 (Plate) - Pin 2 (7A8 Plate)

    • Pin 4 (Grids 3 & 5 / Screen) - Pin 3 (7A8 Grid 3/5)

    • Pin 5 (Grid 1 / Control Grid) - Pin 6 (7A8 Grid 1)

    • Pin 6 (Grid 2 / Oscillator Anode) - Pin 4 (7A8 Grid 2)

    • Pin 7 (Heater) - Pin 8 (7A8 Heater)

    • Pin 8 (Cathode/Grid 5) - Pin 7 (7A8 Cathode)