JRDG Company Special – Amplifier Speaker Binding Posts

Metal Strips

Originally Jeff Rowland amps such as the model 1, model 3 and model 7 used strips with screws for connecting loudspeaker cables. This worked fine for bare wire and spades but would not play ball with bananas. Also, the screws were prone to damage after being tightened and loosened multiple times and would eventually wear out either on the head (making the screwdriver loose grip) or even in the thread. The thing is that the screw sizes used are US standard and these are not easily available in Europe.

Cardas CCGR binding posts

Later (from model 2 and 6 and onwards) JRDG used Cardas CCGR terminals that accept bare wire, spades and bananas and are very sturdy.

Cardas CPBP terminal

The most recent JRDG amplifiers use a newer Cardas design that has only one wheel by which you tighten both plus and minus. Contrary to what is being said on forums, early incarnations of these connectors also took bananas, because the metal parts were hollow. You could simply remove the wheel all the way and facilitate bananas. However, later models used solid parts and there is no easy way to accommodate bananes, unless you want to squeeze them in risking making them squarish.

There is a Cardas-approved mod however, as illustrated below.

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