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Graham & List,<br /><br />Since Graham's post I dug out my Penny Whistle and examined it. There are no insulators on the PA transistors.<br /><br />Also, the output transformer is pretty simple, I probably did not make the driver transformer exactly as it should have been made. I should have twisted the wires together with more twists per unit length.<br /><br />John, W0GN<br />
<p>On 2019-04-13 5:56 pm, Graham / KE9H wrote:</p>
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<div dir="ltr">John, W0GN said:
<div>>>> New insulators were used with the transistors that were replaced. </div>
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<div>What insulators are you referring to?</div>
<div>The PA transistors in PennyWhistle are real RF transistors, with the FET source brought out on the metal mounting tab.</div>
<div>They are supposed to be mounted metal on metal to the heatsink.</div>
<div>No insulators.</div>
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<div>--- Graham / KE9H</div>
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