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SE 811 amp schematic...
SE 811 amp schematic...
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Old 16th July 2019, 05:50 PM   #61
knockbill is offline knockbill  United States
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Location: SE PA
I don't know those tubes,,, Svetvana won't work in my amp tho,,, I only use old NOS tubes,,, never tried foreign new issue
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Old 18th July 2019, 12:13 AM   #62
multi is offline multi  Australia
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you can use the Chinese 572, don't last as long as the Russian 811A. 20 years Chinese 2-4 years

You can use the Svetlana 572/160 no top cap but very expensive
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Old 19th July 2019, 07:57 PM   #63
sganti is offline sganti  United States
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Default 811A Schematic

Here is a 811A Amp I have built using source follower to drive the grid of 811

The filament and source follower supply are on a separate chassis. For the 811A filament supply, I was initially using LCRCL supply, and then changed to meanwell's SMPS supply, and did not hear any difference and its cheaper and less bulky
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Old 19th July 2019, 08:01 PM   #64
sganti is offline sganti  United States
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Schematic attached
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File Type: jpg 811A-6E5P-Jan-27-2019-JPEG.jpg (200.3 KB, 104 views)
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Old 20th July 2019, 10:23 AM   #65
michaelvv is offline michaelvv  Denmark
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Hi sganti.


Nice schematic , have you tried the russian 811a tubes with top anode ,
or which 811a tubes do you use ???
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Old 20th July 2019, 01:32 PM   #66
sganti is offline sganti  United States
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I have a bunch of old RCA 811A's with top cap, I have been using them
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