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The EH tubes out there these days tend to be hotter biasing. In fact it is difficult to get cool biasing EHs from the factory right now. So be careful that the tube vendor knows what he's selling!
That's probably why Manley wont sell the 6CA7 replacement tube set up any more. They used to offer both the EL34 or 6CA7 replacement tube packages for these amps, but no more and its probably because of this issue....
Thanks again. regards
fin, this is what I was told by Manley staff.
The Snappers were designed with EL34s and initial production shipped with those. That is why you'll see EL34 identified on the top plate. Then they began seeing problems with quality from their supplier so switched production to 6CA7s. After some period of time they found acceptable quality in EL34s again so changed back again. That is how they are produced today and what they recommend for re-tubing. Sorry, I can't identify timeframe for the changes.
Mine had 6CA7s when I bought them and since they were strong I didn't want the expense of changing back to EL34s.
"The piano ain't got no wrong notes." Thelonious Monk
They test very strong. Marshall's bias pot seems to have enough range to handle this. This tube lasts forever in road-bound amps. Really tough cookies!
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