<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">+1 agree with what others have said.<div class=""><br class=""></div><div class="">Modern single caps are so small compared to the ones you’re replacing, you’ll find you’ve got space left over. Mounting things if you’re not going for the vintage-radio-style-hide-it-in-the-can can be tricky, but glue is good stuff!</div><div class=""><br class=""></div><div class="">I did something similar on an old tube amp. The massive power supply capacitors had snapped leads from the whole thing being shaken about. They’d once been zip-tied to the board, but had worked loose enough for the movement to fatigue the leads. It was much better afterwards!<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 7 Jun 2020, at 17:25, John Speth via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<meta http-equiv="content-type" content="text/html; charset=UTF-8" class="">
<div class=""><p class="">Hi experts,</p><p class="">I'd like to attempt hum elimination on a 1972 Wurlitzer 4027
organ. I'm pretty sure the bridge rectifier filter electrolytic
caps are aged to the point at which they don't filter so well
anymore. The power supply uses 4 inch tall multi-capacitor cans
mounted on the PS chassis with pins in the chassis and the cans
external to the chassis. All caps are employed for a total of 10
caps in three metal can packages. Are these antique parts even
available in new, recently manufactured form anymore? If so,
where?</p><p class="">There are three cans comprised of:</p>
<ol class="">
<li class="">500uF/25V x 2, 500uF/35V, and 1000uF/25V (4 caps)<br class="">
</li>
<li class="">1000uF/25V x 2 and 5000uF/25V (3 caps)<br class="">
</li>
<li class="">3500uF/25V and 1000 uF/25V x 2 (3 caps)<br class="">
</li>
</ol><p class="">Ideally, using exact replacement of new parts would be best (and
maybe costly, I fear). Non-ideally, I could wire new single cap
electrolytics but that would end up looking like a frankenstein
fix (probably work but bulky). Furthest from ideal is buy a new
current technology PS and use diodes or something to drop the
highest voltage to obtain the multitude of lower voltages (22.5V
--> 20.0V, 19.9V, 19.5V, 17V, and 10V). That might solve the
problem but any engineering miscalculation could fry other parts
of the organ.</p><p class="">Another question: There is a 0.01uF/1400V cap across the PS
transformer primary coil. What is the function of that cap?</p><p class="">Thanks, John Speth</p><p class=""><br class="">
</p>
</div>
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