Grampian made some fine ribbon microphones, and the GR1 and GR2 were our Microphones of the Month in May of last year. Here’s a scan of the original Grampian GR1/2 manual.

Grampian GR1 or GR2 ribbon mic

The mic also came with a word of caution….

Don’t test a ribbon mic with a multi-meter or else…

I am particularly pleased to see the warning not to use a DC meter on these. Quite often I come across ebay auctions where the seller measures ribbon mics with a multimeter, unaware that the carrier current can bump the ribbon out of the magnetic field and stretch it. 🙁

Grampian also made matching transformers for their mics – we have a few available for sale. Here is the factory drawing for the transformer.

Grampian matching transformer wiring.

I posted some other Grampian documents last November.

Many thanks to Pete Guppy for sending this in.