IBM 1620 Project Journal

Parts




Transistors
Part # Description Replacement Notes
015 PNP, low noise? 2N380, 2N502A, 2N247, 2N384, 2N500 sense amp, 1st stage
021 PNP, TO-3, pwr 2N1303, 2N1309 mem I source
022 PNP, stud mount, pwr 2N174, PG-5 lo-v pwr supply
025 PNP 2N1303, 2N1309, 2N1381
026 PNP 2N270, 2N324, 2N404, 2N526, R212XC diff amps, crowbars,
Tim has 1
028 PNP 2N1038, 2N1039, 2N1040, 2N1041, 2N1042, 2N1043
033 PNP, lo-pwr 2N1303, 2N1309, 1-D, 2N274, 2N503, 2N368 Steve has some
034 PNP 2N1303, 2N1309, 1-D not used in 1620?,
Tim has 4
036 PNP, TO-3, pwr 2N456, 2N1159, PG-14, 2N1383
038 PNP, stud mount, pwr 2N379, 2N1412, PG-5, 2N378 hi-v pwr supply
039 PNP, drift, hi-speed 2N705, 2N706
045 PNP, drift, hi-speed

065 NPN
sense amp, 2nd stage
071 NPN, TO-5 2N377, 2N647, 2N1302
078 SCR, TO-5, 100v

083 NPN 2N388, 2N1302 complement of 033?,
Tim has 7, Steve has some
086 NPN, TO-5, pwr 2N188, 2N214, 2N228, 2N557, 2N1302, 2N1304 decode sw's, crowbars
091 NPN, TO-5 2N214, 2N228, 2N557, 2N1302 I driver, big heat sink
101 PNP, drift 2N705, GL-77 equivalent to 045?,
Tim has 1
105 PNP, drift 2N705, GL-77 not used in 1620?,
Tim has 1
106 PNP, drift 2N705, GL-77 equivalent to 039?
108 PNP, stud mount power
Tim has 11

Diodes
Part # Description Replacement Notes
As


AAs


AEs


AU


CD


CG


FS


GS


JS


Capacitors
Part # Description Replacement Notes




Resistors
Part # Description Replacement Notes




Miscellaneous components
Part # Description Replacement Notes
22554-01 cartridge panel light, 10v, 14ma Eldema CF03-CCB-1869 available from Peerless Electronics
55C1 torpedo console light Sylvania 55C1 or GE 55C1 a few available from Sunray Lighting
24CSB
48CSB
telephone slide base lights
these are available from Pacific Lamp Wholesale

muffin fan


squirrel cage fan