Figure 32. Tuning unit 3, sixth if. amplifier V409 and cathode follower V410, schematic diagram.

t h e plate voltage-dropping circuit

acitor C455 is the cathode bypass

capacitor.

is bypassed by C459. The third if.

amplifier is coupled by T406 to the

(2) The control grid dc return path is

fourth if. amplifier, V407.

through the parallel network of

(4) A parallel path for feeding B+ volt-

R434 and the secondary winding of

a g e to the 42-mc if. preamplifier

i f . transformer T405.

i s connected to the low-potential

(3) B+ voltage for the screen and plate

side of R442. A second decoupling

is fed from the 150-volt line

r e s i s t o r , R436, connects the 150-

t h r o u g h decoupling resistor R422

v o l t line through the feedthrough

a n d bypass capacitor C461 to the

b y p a s s capacitor, C454, to the if.

junction of R437 and R439. Resistor

p r e a m p l i f i e r subassembly.

R437 is the screen voltage-

(5) T h e 6.3-volt ac heater voltage is

dropping resistor which is by-

a p p l i e d to the underground heater

passed by C458. Resistor R439 is

Figure 32. Tuning unit 3, sixth if. amplifier V409 and cathode follower V410, schematic diagram.