Schematics of Atanasoff-Berry Computer logic circuits?

[Scanning]

Tony is correct. I sell Tesla type ECC-83s to the audio tweaks. It is the
functional equivalent ( except better ) of a 12AX7 dual triode. The filament
on the ECC is on pins 4 and 5 with a center-tap connected to pin 9 such that
you can run the filament at either 6.3 or 12.7 Volts.

Best regards, Steven


> > As per the 1982 Amateur Radio Handbook, ECC83 (and ECC82) are double
> > triodes.  Type 83 is described as a half wave rectifier in the 1951
>
> Correct, but I think you've misinterpetted what I was saying.
>
> Philips/Mullard valve numbers are actually quite informative, and can be
> decoded as follows :
>
> First letter gives the heater/filament rating :
> A = 4V
> B = 180mA???
> C = 200mA
> D = 1.5V
> E = 6.3V
> G = 5V (early-ish ones, later used for miscellaneous ratings)
> H = 12.6V?
> K = 2V
> O = Semiconductor (no heater)
> P = 300mA
> U = 100mA
> Y = 450mA
>
> (Where a current is given, the valve was intended for series-string
> operation)
>
> Subsequent letters give the electrode structure. For multi-section vales,
> they're given in alphabetical order
> A = diode
> B = double diode
> C = triode
> D = power/output triode
> E = signal tetrode
> F = signal pentode
> H = hextode/heptode
> K = heptode (phantom-cathode tpye of fequency changer)/octode
> L = power/output tetrode/pentode
> M = tuning indicator ('magic eye')
> N = thyratron (gas-filled triode/tetrode)
> Q = nonode
> X = gass-filed full-wave rectifier
> Y = half-wave rectifier
> Z = vaccume full-wave rectifier
>
> The first digit gives the base type
> None/1 = miscllaneous (often only a single-digit number means P side
> contact base)
> 2 = B8B 'Loctal' For 3-digit numbers, 2 = B10B
> 3 = International Octal
> 4 = B8A Rimlock
> 5 = B9G. For 3 digit numbers, 5 = B9D
> 6,7 Subminiatores
> 8 = B9A Noval
> 9 = B7G (7 pin miniatore)
>
> Other digits distinguish between valves where the rest of the code is
> the same.
>
> Now the oroginal poster was talking about some 12V-anode-voltage valves.
> He'd rememebrs are frequency changer -- a triode hexode -- with an ECHnn
> bumber. I beleive the full number of that valve is the ECH83. And that
> the EBF83, and possibly the EF83 are als 12V anode types.
>
> This has nothing to do with the the American type 83 rectifier valve
>
> -tony