The ARP 1036 Sample & Hold / Random Voltage Generator ... Two of the circuit shown below were built on a single board.

SCHEMATIC - (click on image to download full-sized version)


Resistors1/4 watt, 10%, carbon composite
56 OhmR24, R25
100 OhmR13
330 OhmR12
R53, R59 (select)
10 KR18, R21, R32, R38, R39
?R36, R40, R54
?R31, R58
47 KR26, R52
68 KR19
100 KR4, R22, R34, R35
150 KR3, R6, R9, R20
1 MegR47, R49
1.5 MegR44
22 MegR16
Trim PotsLinear Taper
10 KR30, R46
50 KR10, R41, R51 ?
Capacitors20%, 35 volt, tantalum
1.0 uFC1, C2 +4A+B
Capacitors20%, 50 volt, ceramic disc
30 pFC11, C12, C16, C17
50 pFC10, C19
100 pFC13
.001 uFC7, C8, C14 (61 nF)
.01 uFC3, C6, C15 (10 nF)
0.1 uFC18 (100 nF)
Capacitors20%, 50 volt, polycarbonate
.027 uFC5 (27 nF)
.015 uFC9 (15 nF)
1N4148CR1 thru CR9
PotentiometersLinear Taper
10 KR7, R26
A2803-004-A *Q1 - Noise Select
TZ81 **Q2, Q3, Q5
2N5172Q4, Q6
Integrated Circuits
LM301AHZ1, Z2, Z3

* - an ARP part number, most likely a 2N5172. Not all 2N5172's are good as a noise source, so these would have been tested and selected.

** - TZ-81 alternate part was the 2N5249, also defunct. 2N3904 would be a modern equivalent. Also a 2N3906 would be the modern substitute for the TZ-581 (alternate 2N5367) that ARP used as the PNP complement to the TZ-81.

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