Measuring low resistance values on a reverb tank.

[Axtman]

I am working on a 70's Silverface Princeton Reverb. The reverb tank is an Accutronics 064063 that is equivalent to the 4AB3C1B. The specifications say the input should be 8 ohms. It measures 1.1 ohms. The specifications say the output should be 2,250 ohms. It measures 168.9 ohms. I know since I am measuring resistance instead of impedance there should be some discrepancy, but these values seem really low.

[g1]

Those numbers are good. See pg.4 of attachment for DC resistance vs impedance readings.

[Axtman]

Thanks g1. If the tank sounds off after I get the amp working, I will replace the tank. But for now I will leave it as is.

[J M Fahey]

Drive and pickup coils are almost fully inductive so impedance to DC resistance ratio is about 10:1 as you found out.

We are used to speakers where resistance is about 70-80% of nominal impedance so we find reverb tanks confusing.