Roy's antique radios and electronics

Centralab PEC (printed electronic circuit) Information

Centralab wafer components

This information is from the 1950's. The Centralab catalog of 1954 says that 45,000,000 PECs are now in use. A 1951 Centralab ad says that PECs are used in 60% of radios and TVs.

They are, I believe, hybrid circuits consisting of conductive tracks and resistors printed on to a ceramic substrate, combined with ceramic capacitors. The whole circuit is encapsulated to form a wafer shaped component. I assume that they gave cost savings to the equipment manufacturer in the form of reduced equipment assembly time, and perhaps they were cheaper than individual components. Typical prices in 1954 were 50c to $1.50, depending on the complexity of the device.

The components are marked "CRL"

PC-2 to PC-92

PC-100 to PC-186
 
Type Pinout Schematic Values Comments
PC-2 CRL PC-2 pinout CRL PC-2 schematic R=2Meg  
PC-21 CRL PC-21 pinout CRL PC-21 schematic R1=500K
R2=110K 		 
PC-30 CRL PC-30 pinout CRL PC-30 schematic R1=240K
C1=1000pF 		 
PC-33 CRL PC-33 pinout CRL PC-33 schematic R1=1M
C1=1000pF 		 
PC-36 CRL PC-36 pinout CRL PC-36 schematic R1=100K
C1=100pF 		 
FILPEC
PC-50 		CRL PC-50 pinout CRL PC-50 schematic R=47K
C1,C2=100pF 		 
FILPEC
PC-51 		CRL PC-51 pinout CRL PC-51 schematic R=47K
C1,C2=150pF 		 
FILPEC
PC-52 		CRL PC-52 pinout CRL PC-52 schematic R=47K
C1,C2=50pF 		 
MIDGET
TRIODE
COUPLATE
PC-70 		CRL PC-70 pinout CRL PC-70 schematic R1,R2=500K
C1=5000pF
C2+C3=250pF 		Capacitors 450vdc working
Resistors 1/5W
Replaces plate load and grid resistors, coupling and plate rf bypass capacitors, in audio circuits.
MIDGET
TRIODE
COUPLATE
PC-71 		CRL PC-71 pinout CRL PC-71 schematic R1=250K
R2=500K
C1=5000pF
C2+C3=250pF 		Capacitors 450vdc working
Resistors 1/2W
Replaces plate load and grid resistors, coupling and plate rf bypass capacitors, in audio circuits.
STANDARD
COUPLATE
PC-80 		CRL PC-80 pinout CRL PC-80 schematic R1,R2=500K
C1=0.01mfdF
C2+C3=250pF 		 
STANDARD
COUPLATE
PC-81 		CRL PC-81 pinout CRL PC-81 schematic R1=250K
R2=500K
C1=0.01mfd
C2+C3=250pF 		 
STANDARD
TRIODE
COUPLATE
PC-84 		CRL PC-84 pinout CRL PC-84 schematic R1,R2=500K
C1=0.01mfdF
C2+C3=500pF 		Capacitors 450vdc working
Resistors 1/5W
Similar to PC-70. but higher value capacitors.
PENTODE
COUPLATE
PC-90 		CRL PC-90 pinout CRL PC-90 schematic R1=4.7M
R2=1M
R3=2.2M
C1=5000pF
C2=50pF
C3=2000pF 		 
PENTODE
COUPLATE
PC-91 		CRL PC-91 pinout CRL PC-91 schematic R1=4.7M
R2=1M
R3=2.2M
C1=5000pF
C2=100pF
C3=5000pF 		 
PENTODE
COUPLATE
PC-92 		CRL PC-92 pinout CRL PC-92 schematic R1=4.7M
R2=1M
R3=2.2M
C1=5000pF
C2=100pF
C3=2000pF 		 
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