This info can me used to mod the SB201 and SB221 to 10 meters.
It describes the 10 Meter section of the SB200 and SB221.

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Here are the details for Ten meters on the SB200.

Input network is an L-network like 15 meters. However, the capacitor is 68 pF.  The coil (part # 40-728) is approx. 2 1/3 turns # 18 wire, coil length is 5/32" and coil Dia. is 3/8".   Use the 15 meter coil for visual details.

Plate circuit.  The 10 meter tap on the 15/10 meter coil is  4 turns from plate tuning capacitor end of coil, and 4 3/4 turns from the bandswitch 15 meter end of coil. Also the junction of the 80/40/20 meter coil.   

The 10 meter tap is on the bottom of the 10/15 meter coil.

I hope this information is clear.  Having the unit to look at helps.




Here is the info on Ten meters on the SB220.

Input network is like 15 meters.  The capacitors are 115 pF on the RF input side, and
2 each 22pF on the filament side of the coil.  The coil is 0.58 uH.  Part # is 40-964.
This is the same part number as the 15 meter coil.

Plate circuit.   The 10 meter coil tap is 3 3/4 turns from the plate tuning capacitor end of coil.
The tap is on the side of coil.  Same side as the bandswitch wafer.  The connection between
the coil and the bandswitch is made using a silver plated strap (1/4" wide).   

Hope this helps those interested in adding 10 meters to these Heath Kit amps.
I don't know if the bandswitches in these two amps have the terminal for 10 meters or not.

Doug/K5CR