Service note index:  Black in progress   

01.  001a  Erratic or oscillation in transmit mode while peaking the preselector.  SR-2000 and SR-400  

02.  002a  Impossible to properly neutralize the 10 Metre band SR-2000

03.  003a  Design issues that must be corrected to stabelize the 10 Metre band.  SR-2000

04.  004a  Jammed slug removal simplified

 05.  005a 300Mc oscillation in SR-2000

06.  006a Pre-selector capacitor problem in SR-2000 and SR-400 series

07.  007a IERC heat dissipating shield for 6AQ5A  See Page 1 Note 6 of restoration.  SR-2000 SR-400

08.  008a SX-115 selectivity switch design problem

09.  009b Final tune up procedure.  SR-2000

10.  

11.  011a  6.5Mc 1st I.F. alignment procedures.  SR-2000 SR-400 SR-400A

12.  012b  VFO drift notes.  SR-2000 SR-400 SR-400A

13.  013a  VFO inductor note.  SR-2000 SR-400 SR-400A

14.  014a VFO 3rd harmonic note.  SR-2000 SR-400 and different for SR-400A

15.  015a  VFO gear train and mechanics.  SR-2000 SR-400.  SR-400A    

16.  016a  VFO CIRCUIT CHANGE.  SR-2000 SR-400 NOT SR-400A  

17.  

18.  

19.  019a  VFO backlash gear tips  

20.  020a  VFO FMing problem and fixes

21.    

22.  022j  Capacitors and what you need to know

23.  023a Capacitors, measure and calculate series resonance, inductance, Q, and dielectric absorption.

24.  024a Capacitors, measure capacity variation with voltage change.

25.  025a  Miscellaneous capacitor information.

26.  SX-117 Info

27.  SX-117 Sweep photos.

28.  SX-115 Sselectivity problem

29.  

30.  030b  Testing and matching the 8122   (Send a note and I'll forward it to you to verify clarity) 

31.  

32.  Neutralizing the SR-2000 or Grid driven amplifiers Part 1

33.  Neutralizing the SR-2000 or Grid driven amplifiers Part 2

34. 

35.  035A  VFO FMing 60 cycle sidebands (SR-2000, SR-400 cyclone 2, and sr-150 A version)

36.  036A  VFO FMing --- SR-150 level "A" radio --- location of the misplaced 5uf cap

37.  

38.  

39.  

40.  040A  SR-2000 drive quick check

41.  

42.  042A  The 8122 enigma

43.  043A  Beam Tetrodes

44.  

45.  

46.  HA-5 VFO Upgrade information

47.  

48.  

49.  

50.  

51.  

52.  

53.  

54.  

55.  

56.  056a  Hum mitigation note 

57.  

58.  

59.  

60.  

61.  

62.   SR-2000 1971 band switch change

63.   SR-2000 and NCL-2000 Final bandswitch design issues and fixes

64.  SR-2000 Final band switch photos  

65.  SR-2000 NCL-2000 enhanced band switch configuration 

 66.  

67.  NCL-2000 Band switch

68.  

69.  

70.  070a  

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