Compatible reverb tanks for the G. Forest Cook Reverb 2 circuit

[orangecountylumbertruck]

Hello collective braintrust,

I'm looking at building a reverb cabinet based off this circuit by G. Forest Cook:

http://www.solorb.com/elect/musiccirc/reverb2/
and Gaussmarkov's page: http://gaussmarkov.net/wordpress/circuits/spring-reverb/

I see in the schematic, and other examples people use the 8AB2A1B tank, a 10ohm input, 2575ohm output Z tank, was wondering if there are any issues with using a 4AB3C1C tank, rated at 8ohm / 2250ohm impedence?

TIA,
O.C. lumbertruck

[Phoenix]

It should work fine.

Merry Christmas!

[amptramp]

A kindred soul!  I also use 70 volt distribution transformers for output transformers and although they are not really rated for DC current, they never seem to object.  The 10 watt tap is 500 ohms so you can use a lower-power tap (5 watt would be 1000 ohms) to ease the load on the 5532 sections.

[PRR]

> 8AB2A1B tank, a 10ohm input, 2575ohm output Z tank
> 4AB3C1C tank, rated at 8ohm / 2250ohm impedence?

Same thing electrically. Reverb coil impedances are VERY approximate, vary with frequency, and for historical reasons Hammond used two different frequencies for different series of tanks.

I assume you have compared length, spring-count, and nominal times. Generally more/longer springs are better, constrained by budget and cabinet size. But the electronics don't change for that.

[orangecountylumbertruck]

Awesome, y'all are great, thanks for the quick replies.  I've placed my order for the 4AB3C1C, hopefully can post some pics once my project is done.