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Old 6th Nov 2017, 4:12 pm   #2
Tractorfan
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Join Date: Mar 2008
Location: St. Frajou, l'Isle en Dodon, Haute Garonne, France.(Previously: Ellesmere Port, Cheshire, UK.)
Posts: 3,183
Smile Re: Why did Ferrograph do this?

Hi,
Do they plug into a second valve holder in the chassis?
If so, and it's just my guess, maybe it's a convenient way to alter the amp characteristics and/or equalisation curves, etc.
Cheers, Pete.
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