We are often encouraged to simply replace all the filter capacitors in any older guitar amplifier, but this is often unnecessary. Using an ESR Meter, it is easy to determine whether the existing electrolytic capacitors are fully functional, marginal, or truly in need of replacement. This video shows the entire test procedure, using a completely original 1955 Gretsch Model G6155 Amplifier and a Blue ESR Meter from AnaTek Corp (link below). The results may surprise you.

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Here is a link to the AnaTek web site: www.anatekcorp.com/blueesr.htm Note:
I have absolutely no affiliation with this company.

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