EL86 Valve Designs

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Nidri

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Morning fellow insomniacs and/or early risers.

Does anyone have experience with an EL86-based amplifier?

Found some designs:
http://www.audioxpress.com/article/The-SPP-Amplifier
http://www.single-ended.com/Lagarto/el86pp.htm

Reason I bring it up is NOS EL86 valves seem to cheap and in plentiful supply:
http://www.vivatubes.com/tests-nos-telefunken-germany-6cw5-el86-grey-plate-top-o-get-vacuum-tube-100/
https://www.ebay.de/itm/MP-EL86-Siemens-Matched-Pair-old-Stock-in-Box-Rohre-24076/202305123757?hash=item2f1a5335ad:g:nZ4AAOSwgZ1XszOU
http://www.vivatubes.com/true-nos-nib-amperex-holland-6cw5-el86-grey-plate-top-o-get-vacuum-tube-100/

Or is there perhaps a reason this valve is (relatively) rarely used?

EL84 vs. EL86:
https://frank.pocnet.net/sheets/010/e/EL84.pdf
https://frank.pocnet.net/sheets/010/e/EL86.pdf

Only reference to EL86's I could find on AVF:
https://www.avforums.co.za/index.php/topic,21735.0.html
 
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