and S64P (5-kw) , one branch returning to DllF and the other
to e ither S56P ( 50-kw) or S55P ( 5-kw). The former branch is
connected through DllF in the " Operate" pos ition to terminal
26F, then to terminal lOA and through D4A and 15A t o 137F,
through D5F, 133F and 16A to the relay S3A which applies
power to the high-voltage rectifier in the oscillator ampl i
fier. The other s i de of S3A returns through 13A, 25F and
DllF to the return side of the c ontro l circuit . The other
branch of the control cir cuit proceeds from terminals 43 and
48 of DP51P to operate either S56P ( 50-kw) or S55P ( 5-kw ) ,
energiz ing the as sociated bias rectifiers . The auxiliary
contacts of these contactors extend the control for the ap
plicati on of plate voltage, from appropriate points in the
amplifier filament branch of the control circuit .
Power Interrupti ons
When the rectifier filaments are energized, 230 volts
fTom the control circu it are applied to auto-trans former
LlF which in turn supplies 115 volts to terminals 1 and 2
of Sl6F. Rectox RFl and condenser Cl then provide a d-c
vo ltage across voltage divider R3. Condens er C2 starts
charging through Rl . When the vo ltage across C2 reaches the
proper value, Vl breaks down and starts conducting between
the two principal electrodes .
As
s oon as the tube starts
conducting there will be a conducting path establishe d from
the third electrode to one of the main electrodes . Relay
Sl in series with this third e lectrode will oper ate and
clos e its contacts connected to terminals 3 and 4. The
back contact removes an equivalent load from the circuit
when the relay is energized. If Sl6F is de-energized, C2
will dis charge through Rl and R3 and for a very short time
will maintain a current between the electrodes through R2 .
If voltage is reapplied while the condenser is sti ll at
2 2
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