Heathkit Service Bulletins - SB-200 (Updated & Complete)
Joseph W Lutz
joelutz at JUNO.COM
Fri Jan 9 22:46:36 EST 1998
January 22, 1976
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-1
Meter Switch Lugs Shorting To Bottom Cover
The meter switch supplied in the kit may have long lugs on the switch,
which can result in shorting of lugs 6 and 7 of the switch to the bottom
cover. Shorting lug 6 of the switch to the bottom cover will cause the
antenna relay to close when the meter switch is in the "grid" position,
and release in the "plate" position.
Shorting of lug 7 to the bottom cover will cause antenna relay closure in
any position of the meter switch.
These switch lugs should be bent to prevent shorting.
------------------------------------------------------------------------------------------------------------------
February 3, 1976
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-2
Replacement Fan Blades
The PN 266-21 fan blade is no longer available. The PN 266-900 blade
will be used as a replacement. When using the new blade, the set screw
must also be changed.
-------------------------------------------------------------------------------------------------------------------
December 5, 1977
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-3
Difficulty in Mounting Capacitor
++++Information not available at this time++++
-------------------------------------------------------------------------------------------------------------------
May 15, 1979
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-4
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 noticeably degrade the products' shielding
capabilities.
-----------------------------------------------------------------------------------------------------------------
January 21, 1980
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-5
Apparent Self-Oscillation When Used with Kenwood
Transceivers
++++Information not available at this time++++
------------------------------------------------------------------------------------------------------------------
February 7, 1980
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-6
Presetting the Loading Capacitor
++++Information not available at this time++++
-----------------------------------------------------------------------------------------------------------------
March 7, 1980
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-7
Interfacing the Linear to Kenwood Exciters
++++Information not available at this time++++
------------------------------------------------------------------------------------------------------------------
September 2, 1980
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-8
RFC3 Overheats and Circuit Breakers Trip
++++Information not available at this time++++
------------------------------------------------------------------------------------------------------------------
April 6, 1984
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-9
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.
-------------------------------------------------------------------------------------------------------------------
March 31, 1988
SB-200 Bulletin No:
1 KW Linear Amplifier SB-200-10
Variable Load Capacitor [PN 26-97] NLA
The #26-97 load capacitor used at C28 in the earlier SB-200 Linear
Amplifiers are no longer available from our vendors. A #26-160 variable
capacitor is now used as a replacement. Installing the new capacitor
requires drilling new mounting holes in the chassis and rerouting the
wiring. When Heath Parts Replacement receives an order for the #26-97
capacitor, they'll send the #26-160 capacitor and an instruction sheet
[PN 597-4951] to tell the customer how to install the capacitor.
-------------------------------------------------------------------------------------------------------------------
Thats everything I hold up to 1989 that covers the SB-200. Enjoy!
-------------------------------------------------------------------------------------------------------------------
73 de Joe W7LPF/4 [NNN0KUU]
QWCA - SOWP - NCVA - FISTS - RCC
Gordonsville, Va 22942 [Orange Co]
--- --- --- --- --- --- --- --- --- --- --- --- --- --
To subscribe: listserv at listserv.tempe.gov
and in body: subscribe HEATH yourfirstname yourlastname
To unsubscribe: listserv at listserv.tempe.gov
and in body: signoff HEATH
Archives for HEATH: http://www.tempe.gov/archives
--- --- --- --- --- --- --- --- --- --- --- --- --- --
More information about the Heath
mailing list