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<div class="moz-cite-prefix">I've seen that from time to time on
other US-made stuff - it's just an alternative to the shoulder
washer technique.</div>
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<div class="moz-cite-prefix">TBH, anything made of plastic that fits
should be suitable. The voltages present are relatively low in
insulation terms, so high resistance is not a requirement - it
just needs to not be a conductor. And the maximum heatsink
temperature must surely be only 80C or so (hopefully lower, though
I understand the early Prophets run pretty hot) or the regulators
would be shutting down, so you're only looking for a material that
could survive in boiling water without liquifying.</div>
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<div class="moz-cite-prefix">Get a suitably-dimensioned nylon spacer
and Bob's your uncle (translation for non-UK readers: that'll be
fine).</div>
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<div class="moz-cite-prefix">Cheers,</div>
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<div class="moz-cite-prefix">Steve L.<br>
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<div class="moz-cite-prefix">On 22/03/2023 19:52,
antti.s.pitkamaki--- via Synth-diy wrote:<br>
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<blockquote type="cite"
cite="mid:1BD2ECC4-17A2-4F0D-A8A3-B85251307C27@gmail.com">
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<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">I’m restoring a vintage Prophet 10. When
reinstalling the power supply I noticed it is missing one of
the power regulator insulators - It’s a cylinder-shaped piece
of semi-transparent fairly stiff plastic through which the
screw of the regulator goes. The insulator should be in the
hole of the heat sink, preventing the regulator’s screw from
short circuiting to the heat sink. The insulator measures as
follows: OD 6.4mm (0.25in), ID 4.2 (0.165in), length 3.3mm
(0.13in).</span></p>
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<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">Now when googling for this part it seems the modern
equivalent is a type of a shoulder washer - these wouldn’t
work, it needs to be ”shoulderless”.</span></p>
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line-height: normal; min-height: 22px; -webkit-text-size-adjust:
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<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">Any tips on what to use as a substitute? Adequate
resistance to heat and high electrical resistance are probably
the required features of the material. I was thinking of a
silicone tube, cut to the correct length and the inside
diameter driller to the correct size (I can only find a tube
with the correct outer diameter).</span></p>
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line-height: normal; min-height: 22px; -webkit-text-size-adjust:
auto;"><span class="s2"></span><br>
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<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">Another idea I’ve got is a cylinder-shaped nylon
spacer, some seem to be a close match.</span></p>
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line-height: normal; min-height: 22px; -webkit-text-size-adjust:
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<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">Then there’s 3D printing, but dunno about the
suitability of printable plastics.</span></p>
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line-height: normal; min-height: 22px; -webkit-text-size-adjust:
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<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">Any suggestions? It’s strange that no modern
equivalent seem to be available. Wine Country couldn’t help
me.</span></p>
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line-height: normal; min-height: 22px; -webkit-text-size-adjust:
auto;"><span class="s2"></span><br>
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<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">Best regards,</span></p>
<p class="p3" style="margin: 0px; font-stretch: normal;
line-height: normal; -webkit-text-size-adjust: auto;"><span
class="s2">Antti</span></p>
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