NRTD: 6P3S matched quad

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RectifiedAmps
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Re: NRTD: 6P3S matched quad

Post by RectifiedAmps »

The problem with 6P3S tubes is not dissipation - it's their maximum voltage ratings. Apparently the max plate/anode voltage is 400V and the max screen is 300V. You can probably push the anode voltage out to 450V without problems but Mesas put 350-400V (or more) on the screens, which will be your weak link in the long run. If these are the 6P3S-E then they have a higher rating and should be ok, but if they're standard 6P3S I'd be careful if using them in an amp where there's no fusing that protects for screen shorts.

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Re: NRTD: 6P3S matched quad

Post by NippleWrestler »

RectifiedAmps wrote: Fri Aug 13, 2021 2:54 pm The problem with 6P3S tubes is not dissipation - it's their maximum voltage ratings. Apparently the max plate/anode voltage is 400V and the max screen is 300V. You can probably push the anode voltage out to 450V without problems but Mesas put 350-400V (or more) on the screens, which will be your weak link in the long run. If these are the 6P3S-E then they have a higher rating and should be ok, but if they're standard 6P3S I'd be careful if using them in an amp where there's no fusing that protects for screen shorts.
I did find this info, allegedly the English translation of an included data sheet

http://www.rutubes.com/product/6p3s-6l6 ... -tube-nib/

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Re: NRTD: 6P3S matched quad

Post by NippleWrestler »

And then the next comment says:

"That data sheet is also total baloney in terms of maximum voltages, as well as dissipation ratings. These tubes will happily take 500V, possibly more. They're tough as nails."

Don't you love Russian tubes?

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Re: NRTD: 6P3S matched quad

Post by RectifiedAmps »

The problem is that a lot of people mean 6P3S-E when they just say 6P3S. The E variant can take up to 500v and I think that’s the one everyone raves about for being tough. You might be fine with standard 6P3S - most russian tubes can be pushed well beyond their rated values. All valves fail eventually, but a valve pushed beyond its limits will fail in a more ‘spectacular’ manner when it finally goes. YMMV of course and if it’s fused appropriately then it shouldn’t matter either way.

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Re: NRTD: 6P3S matched quad

Post by NippleWrestler »

RectifiedAmps wrote: Fri Aug 13, 2021 3:33 pm The problem is that a lot of people mean 6P3S-E when they just say 6P3S. The E variant can take up to 500v and I think that’s the one everyone raves about for being tough. You might be fine with standard 6P3S - most russian tubes can be pushed well beyond their rated values. All valves fail eventually, but a valve pushed beyond its limits will fail in a more ‘spectacular’ manner when it finally goes. YMMV of course and if it’s fused appropriately then it shouldn’t matter either way.
Maybe, but I wouldn't be so sure. They look very different, cost a lot more and have the E printed on the side. But, if someone is getting E suffix for the same price I want to know where.

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Re: NRTD: 6P3S matched quad

Post by sizzlingbadger »

Those voltages were using the 240v tap too, they were higher with the 230v tap that Mesa use when they ship to NZ.
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