🚀 go-pugleaf

In article <38193@lll-winken.LLNL.GOV>, berry@lll-crg.llnl.gov (Berry Kercheval) writes:
> 
> Anyone know what *kind* of vacuum tubes ENIAC used?  Were they 6SN7's?

In
  The ENIAC: First General-Purpose Electronic Computer
  Arthur W. Burks and Alice R. Burks
  Annals of the History of Computing, Volume 3, Number 4, October
  1981, 310 -- 398
some circuit diagrams from the ENIAC are reproduced (Figures 14, 15, and
19).  The labelled tubes in these diagrams are:
   Simplified accumulator program-control circuit: 6SN7, 6L6, 6V6,
                                                   6SA7, and 6J5.
   Decade counter: 6L6, 6SN7, and 6Y6
   Multiplication table: 6L6 and 6L7

In:
  From ENIAC to UNIVAC: An Appraisal of the Eckert-Mauchly Computers
  Nancy Stern
  Digital Press, 1981
there is mention of the tubes being from RCA and on page 32 is a reproduction 
of the Summary of Tube Failure in ENIAC from:
   Tube Failures in ENIAC
   F. Robert Michaels
   Electronics, October 1947
which lists the following breakdown of tube type in the ENIAC:
    6,550 6SN7 Twin Triode
    4,200 6L6 Beam Power
    2,600 6SA7 Pentagrid Converter
    1,500 6SJ7 Triple Grid Amplifier
    1,300 6V6 Beam Power
    1,200 6L7 Pentagrid Mixer
      500 6AC7 Television Pentode
      350 807 (Enlarged 6L6)
      300 6J5 Dectector Triode
      300 6Y6 Beam Power
[this totals to 18,800 (most articles on the ENIAC speak of there being
18,000 vacumn tubes, so this probably accounts for everything).]

--- BOB (webber@athos.rutgers.edu ; rutgers!athos.rutgers.edu!webber)