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ID = 21560
Tube type:  Damper, booster, flyback diode 
Identical to XY88 = 16AQ3
Similar Tubes
Heater different:
  20AQ3 ; EY88 ; LY88 ; PY88
First year 1957 Tube leaflet collection E.Erb Analysis by original leaflets

Base Noval, B9A
Filament Vf 16 Volts / If 0.6 Ampere / Indirect / Series, AC/DC
Literature Röhren-Taschen-Tabelle, (Franzis RTT)   
  XY88: Personal file
Antonio Rabitti
XY88: mi coleccion
Jose Luis Campayo-Soriano

XY88: RTT Schwandt
Günther Stabe

XY88: RCA Tube Manual
Peter Hoddow

Usage in Models 2= 1963 ; 2= 1964

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

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