809 Tubelab SE ?

Steven-H · 2nd November 2010, 11:56 PM

Just as the title states; anyone give some 809 tubes a try ? I know that this would take some work; but it seems like powerdrive would surely let the grid current flow.

tubelab.com · 3rd November 2010, 12:25 AM

I have some 809's but I haven't tried them in the TSE yet. I have toyed with the 811A which shares the same problem, high plate resistance. I had the 811A running in the TSE a few years ago. I came to the conclusion that the 811A will not do well in SE mode without some feedback. I suspect that the 809 is similar, but haven't actually tried it. For now I have too many higher priority experiments to work on.

Both of these tubes may be viable options with speakers suitable for current drive. Both also require an external filament power supply.

w5jag · 6th November 2010, 06:04 PM

I've thought about using 811A or 572B in a Simple SE - sort of.

My thought was to build up a low power Simple SE for 6Y6, 6W6, 6V6 or something similar and use an interstage transformer insead of an OPT, then use this Simple SE to drive an 811A or 572B output stage in class A2.

This would be basically the same thing as the A2 811A amp on the One Electron website.

I have all of the parts save the interstage transformers, and it should be a reasonably easy project since there are similar builds already out there, but I have a lot of projects to get to before this one.

Win W5JAG

2nd November 2010, 11:56 PM	#1
Steven-H diyAudio Member Join Date: Jan 2007 Location: The 1st State	809 Tubelab SE ? Just as the title states; anyone give some 809 tubes a try ? I know that this would take some work; but it seems like powerdrive would surely let the grid current flow.

3rd November 2010, 12:25 AM	#2
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	I have some 809's but I haven't tried them in the TSE yet. I have toyed with the 811A which shares the same problem, high plate resistance. I had the 811A running in the TSE a few years ago. I came to the conclusion that the 811A will not do well in SE mode without some feedback. I suspect that the 809 is similar, but haven't actually tried it. For now I have too many higher priority experiments to work on. Both of these tubes may be viable options with speakers suitable for current drive. Both also require an external filament power supply. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

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6th November 2010, 06:04 PM	#3
w5jag diyAudio Member Join Date: Feb 2007 Location: Arkansas	I've thought about using 811A or 572B in a Simple SE - sort of. My thought was to build up a low power Simple SE for 6Y6, 6W6, 6V6 or something similar and use an interstage transformer insead of an OPT, then use this Simple SE to drive an 811A or 572B output stage in class A2. This would be basically the same thing as the A2 811A amp on the One Electron website. I have all of the parts save the interstage transformers, and it should be a reasonably easy project since there are similar builds already out there, but I have a lot of projects to get to before this one. Win W5JAG

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