Valve Testing - JHB North

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Nidri

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Rivonia , JHB
As per title, I'm looking for a little help testing some valves.
I bought 4 Sylvania NOS 6DJ8's for my Predator,
but the output of one of the valves was lower so it threw the balance off.
Schalk put the original 6922EH's back in the VA and it's perfect again.
So now I would like to use the Sylvanias elsewhere (e.g. Lyr),
but ideally I'd like to identify the two best matched valves out of the four.
(Forgot to mark the under-performing Sylvania at the time.)
Anyone in JHB can help me with this?
Thanks.
 
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