SE 811 amp schematic...

[knockbill]

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

 

[multi]

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

 

[sganti]

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

 

[sganti]

Schematic attached

 

[michaelvv]

Hi sganti.


Nice schematic , have you tried the russian 811a tubes with top anode ,
or which 811a tubes do you use ???

 

[sganti]

I have a bunch of old RCA 811A's with top cap, I have been using them

 

[artosalo]

Can someone recommend a good SE output transformer for 811A.
It should have 10k primary impedance and 8 and 4 ohms outputs.
I have prototyped with Edcor GXSE15-10k, but I am not happy with it's bass end performance, which is likely due to too low primary inductance.

 

[matejsirk]

Can someone recommend a good SE output transformer for 811A.
It should have 10k primary impedance and 8 and 4 ohms outputs.
I have prototyped with Edcor GXSE15-10k, but I am not happy with it's bass end performance, which is likely due to too low primary inductance.

maybe: Ogonowski.eu - profesjonalne transformatry do wzmacniaczy lampowych

I have 6C33C version and I am very satisfied.

 

[artosalo]

Thanks for the suggestion. However I look for 10k SE OPT as a standard product at first.
Ogonowski does not have such in production.
I know that Toroidy, for example, could make such as a custom product.

 

[emk2]

Hammond 1638SEA ?

Tube-Town Store - Hammond 1638SEA

https://www.hammfg.com/files/parts/pdf/1638SEA.pdf

 

[artosalo]

Thanks.
I have used some Hammonds, 1628SEA for example, but did not remember there was a 10k version.

 

[multi]

NOBU, K, SHISIDO USED ;
430 volts 100ma-3.5k out put transformer.