SV811-3

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simon
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#46 Re: SV811-3

Post by simon »

Ditto, use Rod's suggestions.

For higher currents just keep an eye on the ripple current through that big cap. For GM70 Rod recommended a "choke" input, actually a 0.5R resistor. I was a bit sceptical this would act as a choke input rather than cap input but it did.

Rod's really helpful - if you don't have a specific raw DC recommendation from Rod, if you were to email him and let him know that you have acquired the SV811 amp with his filament regs but would like to try a passive supply rather than the SMPS I'm sure he'd advise.
Cressy Snr
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#47 Re: SV811-3

Post by Cressy Snr »

I found his schematic for the raw Coleman DC supply and it happens that I have the right parts, so I guess I’ll build a copy, using my 9V 300VA twin secondary toroid as the AC source.
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#48 Re: SV811-3

Post by Cressy Snr »

Well, the triple-decker frame is built: a copy of Izzy’s GM70 pp chassis building technique.
Might actually get something done now.
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andrew Ivimey
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#49 Re: SV811-3

Post by andrew Ivimey »

I've used a 'nest' of tables for a pair of 833 silliness.

Tom the dentist used many a medical trolley.

There is no way to do these valves booteek small so spread out - relax and enjoy.
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Ant
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#50 Re: SV811-3

Post by Ant »

I have a load of 2 inch bright red castors to put on the bottom of it to complete the industrial look!
Also starring Rex Hamilton as Abraham Lincoln

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pre65
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#51 Re: SV811-3

Post by pre65 »

Ant wrote: Wed Sep 27, 2023 9:31 pm I have a load of 2 inch bright red castors to put on the bottom of it to complete the industrial look!
Go for it Steve. :)
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pre65
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#52 Re: SV811-3

Post by pre65 »

Steve, if you need any parts for this ask on here. I've got a lot of things that in reality, I'm never going to use so I'd rather see them go to a good home.

All I really want to keep is anything particular to my 833a build.
The only thing necessary for the triumph of evil is for good men to do nothing.

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#53 Re: SV811-3

Post by Cressy Snr »

Cheers Phil,

A bit more progress today. Have got the OPTs and valve sockets mounted on the top deck:
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simon
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#54 Re: SV811-3

Post by simon »

Son of Thomas' Tower of Power!
Cressy Snr
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#55 Re: SV811-3

Post by Cressy Snr »

simon wrote: Fri Sep 29, 2023 7:25 pm Son of Thomas' Tower of Power!
I’m paying homage :mrgreen:
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