Collins Permeability Tuned Oscillators

Identification Guide
The purpose of this database is to identify PTO usage mostly in military equipment. Some data is incomplete and/or unverified.
Last updated July 2016
 

Type

Low
Range
High
Range
Filament
Voltage
Plate
Voltage
Turns Used in Equipment Tubes Notes/Part Numbers/Misc
70E-1 1.0 1.5 12.6 250 10 AN/ARC-2 RT-91 V301 12SJ7 502 1206 003
70E-2 2.0 3.0 12.6 250 10 ARR-15, 51H V301 12SJ7 502 0962 003
70E-3 .45 .55 12.6 250 5 ARR-15, 51H V201 12SJ7 LF Calibrator 502 0879 003
70E-7A 2.0 3.0 6.3 250 10 51J1 V001 6SJ7 503 5047 003
70E-8 2.0 3.0 6.3 250 10 32V3 early models
70E-8A 1.6 2.0 6.3 180 16 310B, 32V3-later models  503 5049 003
70E-8B 1.6 2.0 6.3 250 16 310C 503 0022 003
70E-8C 1.6 2.0 6.3 250 16 32V 503 0022 003
70E-10 .60 .80 6.3 250 10 708-A 503 9550 003
70E-11 1.0 1.5 6.3 250 10 708-A 503 9558 003
70E-12 1.955 2.955 6.3 150 10 75A-2,75A-3 504 6567 004
70E-14 1.6 2.5 6.3 210 10 KW-1 Amateur TX 505 1244 004
70E-15 2.0 3.0 6.3 150 10 51J-1 to 4, RCA SSB-R3 V001 6BA6, V002 6BA6 505 0411 024
70E-xx 1.5 3.0 12.6 150 10 T-195 V801 5749
V801 5749
Oven
Alternate Manufacturer
Dubrow 689-BM128
Reference ER, Dec 1999
70E-18 2.455 3.455 28 28 10 R-392 V801 26D6 505 1413 004
70E-20 1.65 2.05 6.3 210 16     522 0050 004
70E-21 .3 .4 6.3 250 10 708A-3   522 0073 003
70E-22 1.75 3.5 6.3 150 10 ARC-38 26V Oven 522 0316 004
70E-23 2.75 3.75 6.3 210 10 KWS-1 V001 5749 military/ham
70E-24 1.955 2.955 6.3 150 10 75A-4     The famous 75A4 ham receiver
70E-25 2.0 4.0 12.6 210 10 708B-1   522 0200 005
70E-29A 2.0 4.0 12.6 210 10 478R-1  

522 1092 005

spectrum analyzer

70H-1 .470 .980 6.3 @ 600ma 180 @10ma 51 R-389

V701 5749
V702 6BH6 Oven 75C

522 0062 004

Load: 10K fm B+ to center of coax, output voltage .55Vrms

70H-2 2.455 3.455 6.3 180 10 R-390 V701 5749 Oven 75C
70H-3 2.0 3.0 6.3 150 10 Unknown 5749,5749 military
70H-4   1.5   3.0   25.2   180   10   

 522 0067 004

 output 4V@3MC

70H-5 2.5 3.5 6.3 150 10 R-608/ARR-41 V15001 5750 Oven
70H-9 1.5 3.0 6.3 150V/12ma 10 B&W-15000A,T-368 5749,5749 Oven,28V
70H-10 2.58 4.58 6.3 210 16 R-627 URC/8 5749,5749 Oven,115VAC, military
70H-12 2.455 3.455 6.3 180 10 R-390A   Alternate manufacturers:
Cosmos (N4BE Journey) , Dubrow, Motorola, Progresstron, Raytheon
70H-13 2.0 4.0 6.3 130 10 ARC-58,KWT-6,OV-465     
70H-13A 2.0 4.0 6.3 130 10 R-761,18Z    Zener diode and varicap
70J-1 3.1 4.4 6.3 180 16 R-390 BFO None Load: open 17v
455 kc
70K-1 3.455 3.545 6.3 200 1 KWM-1    ham band transceiver used in U2 spy plane
70K-2 2.5 2.7 6.3 130 2 KWM-2, S line

V301 6AU6, later models 7543 

70K-2 PTO Service Adventures by Jim Miller, N4BE
70K-3 2.501 3.5   18 10 50S-1,618-T   +10V bias
70K-4               military/ham
70K-5 2.501 3.5   18   R-390/Manson Labs  10V bias, stabilizer pin military countermeasures receiver
70K-7 2.5 3.5   150   10 51S-1 Receiver V501 7543 Collins part number 
522-2918-00
70K-9 2.501 3.5   18 10 618T-1/2/3   +10V bias, stabilizer pin, 28V oven
  Notes:  Range in Megacycles. If you find errors or wish to contribute please contact W5OR .

Contributions by WA4WDL, Lou De Beer, WA4MZZ, Nick England, and anonymous contributors.