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RE: Brimar v. Mullard EZ81 - how to tell?

Posted by Sondek (A) on July 28, 2024 at 09:53:03

In Reply to: Brimar v. Mullard EZ81 - how to tell? posted by Rzado on July 27, 2024 at 16:57:13:

My two cents worth:

If it was Mullard, I'd expect to see Philips production codes etched in the glass. So, based solely on that my vote is Brimar.

I assume you bought it to use it. I spent almost twenty years with a preamp that used either EZ81/6CA4 or EZ80/6V4. I cycled through every brand of those you can name, and the only one that made any appreciable difference in sound was the RFT EZ81. It subjectively added another octave to the bass. Deep, solid bass, noticeably better than any other rectifier I tried. The RFT's are really easy to spot too. The plates are stacked on top of each other at right angles to one another. And they used to be cheaper than the cachet names by fair amount.

If you're just collecting antiques, don't forget to find a U709. That's the one Genalex made. There's some pretty decent pictures of the various rectifiers of that type at The Valve Museum.

• http://www.r-type.org/index.htm   (Open in New Window)

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