Component

External Component Function

Normal Range

of Value

C11

Exponentially falling or rising signal on pin 3 determines sequencing time

0 – 10 mF

delay and operational mode of the recordplay anti-pop circuitry See anti-

R13

0–50 kX

pop diagram

R14

R16 R14 and C12 determine monitor amplifier response in the play mode

1k – 100k

R15 R14 and C12 determine monitor amplifier response in the record mode

R15

30 kX –3 MX

R16

30 kX –3 MX

C12

01 mF–20 mF

C13

Determines decay response on ALC characteristic and reduces amplifier pop

5 mF–20mF

R17

100k – %

C14

Determines time constant of meter driving circuitry

01 mF–10 mF

R18

100k – %

R19

Meter sensitivity adjust

10 kX – 100 kX

C15

Record output DC blocking capacitor

1 mF–10 mF

C16

Play output DC blocking capacitor

01 mF–10 mF

C17

Changes record output response to approximate a constant current output in

500 pF – 01mF

conjunction with record head impedance resulting in proper recording

R21

5kX – 100 kX

equalization

R22

5kX – 100 kX

C18

Preamplifier supply decoupling capacitor Note that large value capacitor will

01 mF – 500 mF

increase turn-ON time

C19

Supply decoupling capacitor

100 mF – 1000 mF

C20

Decouples bias oscillator supply

10 mF – 500mF

R23

Allows bias level adjustment

0 – 1 kX

R24

Adjusts DC erase current in DC erase machines (for AC erase see ‘‘Stereo

Application Circuit’’

Figure 1 )

L1

Optional bias trap

1 mH – 30 mH

C21

100 pF – 2000 pF

C22

Bias Roll-Off

0001 mF – 001 mF

H1

Recordplay head

100X – 500X

70 mH – 300 mH

H2

Erase head (DC type AC optional)

10X – 300X

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