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I have found a schematic of the organ mate, . Looking at this, I would expect a lowish input impedance, and a high output impedance. This is based on the drive coming from a cathode follower stage (low output impedance) through a transformer, actual output impedance would depend on the transformer ratio, but I wouldn't expect a step up transformer here. Output from the tank is fed directly to the grid of the recovery amplifier valve, which would be a high impedance point.

IIRC the reverb tank on the Organ Mate reverb is the same as e.g. used in the A-100, that is, low impedance input (since driven from the speakers - with that bulb shunt in series). The Organ Mate has a built in output transformer having a low impedance secondary winding that matches the low impedance input (few Ohms) - I did a measurement on 3 tanks (1122). Input Ohm value measured between 0.9 and 2.3 Ohms.

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Christoph

Am 25.04.2020 um 20:27 schrieb Chris Clifton <clifton.christopher@...>:

Also, if you can measure the resistance of the transducer windings, this will give you some idea of the impedance. Generally the impedance will be somewhat higher than the resistance measured with a multimeter. Not so very much higher that you should have any doubt. The Accutronics transducer type with the next impedance up from the measured DC resistance will be the one you want.

On 25/04/2020 18:50, Michael Casino via wrote:

You can start here:

The people at amplified parts can most likely sell you the right one.

-----Original Message-----
From: scott.brand <scott.brand@...>
To: hammondzone <[email protected]>
Sent: Sat, Apr 25, 2020 1:37 am
Subject: [hammondzone] Organmate Reverb

Does anyone happen to know the specs on the tanks used on the Organmate Reverb units?? I've got one here with a busted connector at one of the transducers.? I don't see any model number on the tank itself (just a date stamp from 1968), but there is at least a sticker identifying it as a Hammond-Gibbs unit.? (2 spring)

I'm hoping it'll be possible just to replace the tank.? Any ideas?? Thanks in advance.

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