03-13-2015, 12:52 PM
Brockrak, whoever you decide to use to restore your radio, make sure they use polyester or polypropylene film capacitors for the power supply filters.
Many so called restorers will try to use tiny modern electrolyic capacitors for the original low capacitance paper filter caps. Todays 1 and 2 microfarad electrolytics caps were not designed to withstand the high ripple currents they would be subjected to in this service and will fail in a short time. Film caps on the other hand are designed for such conditions and will last almost indefinitely.
In fact, in discussing restoration of your 87 with prospective restorers, mention the original paper filter caps and what they plan to replace them with. If they say electrolytic caps and do not understand the potential problems, look elsewhere!
Many so called restorers will try to use tiny modern electrolyic capacitors for the original low capacitance paper filter caps. Todays 1 and 2 microfarad electrolytics caps were not designed to withstand the high ripple currents they would be subjected to in this service and will fail in a short time. Film caps on the other hand are designed for such conditions and will last almost indefinitely.
In fact, in discussing restoration of your 87 with prospective restorers, mention the original paper filter caps and what they plan to replace them with. If they say electrolytic caps and do not understand the potential problems, look elsewhere!
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