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Need help with Kraft KPT-6A Tx

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Need help with Kraft KPT-6A Tx

Old 05-31-2016, 07:41 PM
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jaymen
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Default Need help with Kraft KPT-6A Tx

My KPT-6A has a blown output transistor with some cryptic house part number CR866 which means nothing. Does anyone here have a schematic, parts list, or one of the transistors?
Thanks
Jay
Old 06-01-2016, 12:33 PM
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HighPlains
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What year was that transmitter built? I've got some Kraft schematics, but not everything.
Old 06-01-2016, 01:17 PM
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Likewise, I probably have the schematics and maybe even the part, new in bag. Tell me year and battery voltage and I can check for sure.
Old 06-01-2016, 01:24 PM
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Update: I have a new one in a Kraft sealed bag. Kraft p/n 101-032. Numbers on transistor S7930 over CR866. I believe this was the FET output transistor from the later sport series but I no longer remember and no references handy.

Send me a PM and it's yours free. I may need a favor one day! God knows, people have given me enough things over the years so I'm glad to pay back in kind!

Last edited by Truckracer; 06-01-2016 at 01:35 PM.
Old 06-01-2016, 02:48 PM
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jaymen
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Well, the radio is a 1976 KPT-6A Sport series, 6 volt with the vertical board between the sticks. The board is made from blue epoxy-glass.
Thanks to everyone for assistance, as I could use a schematic. Apparently somebody connected this thing to 9.6 volts as the 6 volt 33uF was blown. The encoder and modulator appear to be working, as is the oscillator.

Last edited by jaymen; 06-01-2016 at 03:35 PM.
Old 09-13-2017, 10:43 AM
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Originally Posted by jaymen View Post
My KPT-6A has a blown output transistor with some cryptic house part number CR866 which means nothing. Does anyone here have a schematic, parts list, or one of the transistors?
Thanks
Jay
Jay, how is the circuit board taken off the case? Thanks

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