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Old 2nd August 2021, 09:31 PM
Richard Richard is offline
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Join Date: Dec 2005
Location: Notts
Posts: 5,129
Default Re: 5687 replacement tube.

Yes good decision I think, a couple of NOS 5687 will last a good while. Happy to test your old ones btw, just post them over. Be wary of un-tested used stock as some applications use just one section of these TT valves and one section may be worn out when the other is as-new
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