Electronumpty's Bigbottle MC phono blowout!

Bigman80 · 09-10-2019, 20:40

Originally Posted by Barry

Why do you want to separate the valve bases from the PCB?

It's called the Miller effect: http://www.valvewizard.co.uk/gridstopper.html

However if you do add grid stoppers, you will be changing Alan's design and perhaps the overall sound. I would suggest you seek Alan's advice.

He wants the valves outside the chassis.

I did say he could've mounted the pcb upside down and made those connections very small lol.

Too late now.

**smangus** · 09-10-2019, 21:59

Well that was the plan,

so will have to rethink it. Its not a disaster as I can remount them on the pcb without to much hassle.

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**smangus** · 09-10-2019, 22:03

Think I might hook up as is to see what it sounds like and test the board etc. then remount the sockets and finish the case off . Nothing lost there as I haven't cut the ply yet. Just need to add some ventilation into it.

All part of learning anyway so it's fine by me.

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**Firebottle** · 10-10-2019, 07:38

Andy I would say try it first, there are some grid stoppers on the pcb.

You may get some instability with squeaks and noises. I think it would be OK to fit additional small value grid stoppers in the grid wires, I can advise as necessary.

**smangus** · 10-10-2019, 10:05

Originally Posted by Firebottle

Andy I would say try it first, there are some grid stoppers on the pcb.

You may get some instability with squeaks and noises. I think it would be OK to fit additional small value grid stoppers in the grid wires, I can advise as necessary.

Thanks Alan thats very helpful, I'll give it a shot . Cheers

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**smangus** · 17-10-2019, 16:08

Drilled and filed the back plate for the fittings. Will polish it up a bit some time