Heathkit Service Bulletins - SB-201 (Updated & Complete)
Joseph W Lutz
joelutz at JUNO.COM
Fri Jan 9 22:47:21 EST 1998
May 15, 1979
SB-201 Bulletin No:
Linear Amplifier SB-201-1
Sheet Metal Screws Will Not Tighten
If the perforated covers will not secure properly due to enlarged sheet
metal holes, install a 6-32 speednut [PN 252-22] over the lip and
surrounding hold. The 6-32 X 3/8" sheet metal screw [PN 250-8] will then
tighten securely.
Using the speednuts does not noticeable degrade the products' shielding
capabilities.
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December 10, 1979
SB-201 Bulletin No:
Linear Amplifier SB-201-2
Interfacing the Linear To Kenwood Exciters
++++Information not available at this time++++
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January 21, 1980
SB-201 Bulletin No:
Linear Amplifier SB-201-3
Apparent Self-Oscillation When Used with Kenwood Transceivers
++++Information not available at this time++++
----------------------------------------------------------------------------------------------------------------
March 7, 1980
SB-201 Bulletin No:
Linear Amplifier SB-201-4
Interfacing the Linear to Kenwood Exciters
++++Information not available at this time++++
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July 29, 1980
SB-201 Bulletin No:
Linear Amplifier SB-201-5
Chassis Reinforcement
++++Information not available at this time++++
-----------------------------------------------------------------------------------------------------------------
September 2, 1980
SB-201 Bulletin No:
LinearAmplifier SB-201-6
RFC3 Overheats And Circuit Breakers Trip
++++Information not available at this time++++
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January 30, 1981
SB-201 Bulletin No:
Linear Amplifier SB-201-7
Conversion For 10-Meter Operation
++++Information not available at this time++++
------------------------------------------------------------------------------------------------------------------
January 27, 1982
SB-201 Bulletin No:
Linear Amplifier SB-201-8
No output or Plate Current
++++Information not available at this time++++
-----------------------------------------------------------------------------------------------------------------
February 9, 1982
SB-201 Bulletin No:
Linear Amplifier SB-201-9
Correction to SB-201-4
++++Information not available at this time++++
-----------------------------------------------------------------------------------------------------------------
October 29, 1982
SB-201 Bulletin No:
Linear Amplifier SB-201-10
Unit Oscillates When Used With An Antenna Tuner
++++Information not available at this time++++
-----------------------------------------------------------------------------------------------------------------
April 6, 1984
SB-201 Bulletin No:
Linear Amplifier SB-201-11
Interfacing the Linear to Kenwood Exciters
The ALC voltage to Kenwood transceivers and transmitters should not
exceed -8 volts. To Ensure the proper voltage to the Kenwood, add:
An 8 volt zener diode [PN 56-621] across the ALC connector on the back of
the amplifier. Connect the banded end of the diode to the ground lug.
Adding a control in the ALC line (as instructed in previous bulletins) to
control the level of ALC voltage doesn't always work. This control loads
the ALC line so much that very little ALC voltage is developed, resulting
in the exiter overdriving the linear, In units which have the control
installed and the operation is still unsatisfactory, return the ALC
circuit to its original design and install the zener diode.
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Thats everything I hold up to 1989 that covers the SB-201. Enjoy!
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[[[Note: I have included the Bulletins that I yet to obtain - hopefully
I will be able to get them and 'fill in the blanks' for us all.]]]
73 de Joe W7LPF/4 [NNN0KUU]
QWCA - SOWP - NCVA - FISTS - RCC
Gordonsville, Va 22942 [Orange Co]
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