GU-74B 144MHz Amplifier
by
UT5EC
 
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Front Panel

Top View

Bottom View

Open Top View

Output Capacitors - 1

Output Capacitors - 2

PA Schematic
 
  • L1: 2mm Al
  • L2: teflon coax, 4mm dia, 90mm long
  • C10: constr. tube socket
  • C11: 4700pF
  • (R1 + C14 + R of K1 coil) Time constant = 1sec
  • R6 & R7: GU74B uses "swamped" input for neutralization
  •  
    Plate Line
     
    Operational Parameters
     
  • Ua - 2000v
  • Ia0 - 150ma
  • Ia max - 850ma
  • Ug2 - 280v
  • Ig2 - 20ma
  • Pinp - 15W
  • Pout - 1000W
  •  

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    Last Updated: 20 January 2006
    Feedback: Paul S. Goble, III, ND2X
    Copyright © 2006 by ND2X and UT5EC, all rights reserved