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Heathkit SB-10 Series Troubleshooting Manual page 87

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Figure 13. Audio Circuit Board Modifications
Now during receive, the sidetone will be bypassed to ground by the normally closed
contact on RL1. During transmit, RL1 opens and the sidetone works normally.
Modifications
Page 87
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Hw-101Sb-100Sb-101Sb-102Hw-100

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