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Elenco K-38 Capacitor Substitution Box kit
4.0
The kit instructions are nicely done. Board construction is nice, but the mounting holes for each capacitor are very wide apart, making lead dressing a bit more complicated than normal. I opted to eliminate the two wire/clamp assemblies and instead modified the design, adding banana jacks. I used the hole for the wires for one, and just made it a little larger with a reamer. Then I measured and drilled a second hole above the first and below the slide switch for the second jack. I used discreet banana jacks instead of a combined dual jack assembly because the clearance between the PC board and the box top is not very large; discreet jacks do not stick out from the bottom of the panel as much. I bent the leads over on the bottoms of the jacks to provide more clearance with the PC board. In addition, I screwed a nut on each jack BEFORE mounting it on the box top, thus lifting the jack and providing even more clearance underneath. Small wires connect the PC board to the jacks. The advantage of using jacks is that a variety of leads in various lengths and connectors can be used with this unit now. I tested the unit with 3 different meters; all measured within 2% of each other. The manufacturer specs indicate that with the standard leads provided, and given that each capacitor is 10% tolerance, the measured capacitance compared to the value indicated on the panel will be panel value plus 30 pf, plus or minus 10%. I found that really long leads typically add another 30 pf on top of that. The left-side PF switch capacitors were all rated at least 50 volts minimum, while the right-side UF switch capacitors were all rated at least 100 volts minimum. Note that this kit is available from a number of sources on Amazon, eBay, and others for varying prices, but purchasing it through TEquipment means fast delivery, and a reliable vendor to do business with and/or resolve any issues.
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Anonymous on
Jan 28, 2022
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