Shop Electrolytic Capacitors

The easiest way to order capacitors is to use the special order form or contact page and send me a list of the types you need so I can quote them.  Listed here are some that I have in stock for repairs, but I can source many more types.  These are new and New Old Stock for tube amplifiers, and for general purpose use. 

Electrolyitc caps are often referred to as "filter caps".  Often when replacing the capacitors in a vintage amplifier, the electrolytics are the ones that need to be replaced, not the mica and polyester ones.  These are usually the largest physical sized capacitors in an amplifier.  Some of these are quite rare and very desirable types for vintage replacements, and others are newer styles. The physical sizes vary considerably. So that photos can be shown, I have broken them up into categories and grouped them by lead arrangement (axial or radial leads) and within that by voltage range. All are thoroughly tested and known to be good, and I give you the test data. If you want to preserve as much as possible the look inside your vintage amp, well good luck with that, the old types like the orange Sprague Atoms are hard to find but here is one place to start.

Aluminum Electrolytic Capacitors do have a storage life, and the larger sizes are relatively expensive. I maintain a stock of a variety of these for use in amplifier repairs and also make them available to the public. When in use in a tube type amplifier, the voltage applied continuously "heals" leakage in the dielectric by restoring the oxide layer, as long as the amplifier is used at least four or five continuous hours in a year. But in storage there is no voltage applied, so over a long period of storage electrolytic capacitors can begin to crystallize and naturally degrade in leakage characteristics unless periodically "reformed" by proper controlled application of rated voltage while keeping the leakage current in limits.  The average storage life for quality electrolytics is long, if stored under proper conditions and reformed periodically it can exceed 30 years. But in the most critical environments such as nuclear power plants, storage life is limited to five years unless proper periodic reforming is conducted. Reforming takes up to one hour per capacitor, and involves dangerous voltages. Therefore, some suppliers may not attempt proper storage and testing. But since I am dealing in new and also new old stock caps, I have acquired the proper equipment to accurately test and reform these capacitors and ensure each one is tested annually, and reformed if needed (using a Sencore LC75 capacitor analyzer) at least bi-annually. This takes time and effort, and I do lose a few sometimes. Before shipping, I test each one for capacitance, leakage, and Equivalent Series Resistance (ESR) specs at full rated voltage, to fully meet or exceed industry standards.  Such equipment is not all that commonly available in recent years, because most modern applications are less critical.  But we have it and and use it so you can be completely assured of getting a known good tube amplifier capacitor from us, unlike purchasing from some other possibly less well informed and equipped sources.

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