JVM410H Power valves
0

votes

Hi, to change the power valves of my JVM 410, do I need a matched quartet or I can use two matched pairs? The bias is set by two separate trimmers, one for every pair, so maybe two matched pairs will be enough?

Thanks!

Valve

asked 10 Jun 2016 at 11:48 AM

Edoardo Conti
Answers: 2
0

votes

We would always recommend matching all valves as closely as possible, but feel free to contact jgreen@marshallamps.com for more information.

edited 04 Aug 2016 at 02:36 PM

Chris Robinson (337)

answered 13 Jun 2016 at 10:13 AM

Chris Robinson (337)
0

votes

i reccomend getting a matched quad... 

valves are not only matched by the amount of plate current draw at a given bias voltage on pin 5

they should also be matched for transconductance

TAD in germany does a fantastic job at this in my experience... if i remember correctly, marshall used their KT66's for the vintage modern series

answered 21 Jun 2016 at 11:43 PM

john bolier (36)
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