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Old 27th May 2012, 04:53 PM   #11
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Quote:
Originally Posted by cjkpkg View Post
There is power for power sake and then there are some simple SE designs that sound good.

I have a Tubelab SimpleSE cranking out about 7W running just shy of 500V and using the big honkin Edcor CXSE @ 5K impedance. At 3K it would put out more power (maybe 10W)but have higher distortion. I have some James OPT's with multiple impedance options and I tried 3K and 5K, I much prefer the 5K.

Input tube is a 12AT7 variant and power tubes are EH KT90s's a cousin to the KT88 and I am running each tube around 90mA (pretty hot).

This little amp really cranks and I prefer it to a 300b SE amp I built although I never got to fully debug it when one of the 300b's broke.

With good iron and "premium" coupling caps (I dare not say boutique) I am using Jantzen silver Z's which were like $20 each - you will build a very "high end" sounding amp. IMO decent $10-$30 film or PIO caps would be appropriate here.

Many builds are highly documented here and for such a simple little amp it is a good first tube build and the boards are very high quality although a few people have done this amp P2P wiring.
I built the same amp, currently running EL34s in triode mode, so maybe 5 wpc. I built the amp with UL mode capability for more power, but I never use it because I don't need it.

Like others have pointed out, you want to pair a SET amp with sensitive speakers that don't need more than a few watts.
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Old 27th May 2012, 05:33 PM   #12
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If you want SE sound with real "grunt", search on "anti-triode". Problem already solved. 200 Watts with off the shelf parts, easy... 20 Hz response, high damping factor, easy...
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Old 27th May 2012, 09:43 PM   #13
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Quote:
Originally Posted by AlanL View Post
George got >200 watts - The 833A SE Amp Prototype

I would suggest efficient speakers with a few watts... much easier, safer and cheaper.
A chinese 211,845 or 805 SET is inexpensive and viable in everyday use,
the 833A use a 10 Ampere filament, it will explode the electric bill:
Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
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Old 27th May 2012, 09:50 PM   #14
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Quote:
Originally Posted by FullRangeMan View Post
A chinese 211,845 or 805 SET is inexpensive and viable in everyday use,
the 833A use a 10 Ampere filament, it will explode the electric bill:
Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.

That is very hypnotic. Can't, seem, to look, away.
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Old 27th May 2012, 10:50 PM   #15
7N7 is offline 7N7  United Kingdom
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Quote:
Originally Posted by FullRangeMan View Post
A chinese 211,845 or 805 SET is inexpensive and viable in everyday use,
the 833A use a 10 Ampere filament, it will explode the electric bill:
Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
Yes but I do not thi.k that 1kV HT supplies are suitable for a beginner
Paul
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Last edited by 7N7; 27th May 2012 at 10:53 PM.
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Old 28th May 2012, 12:02 AM   #16
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Brisso57 View Post
Hi from a toob noob.

Just idly wondering what sort of maximum usable power is available
from documented DIY designs for single ended tube amps?

I'm maybe interested in constructing one, and it may as well have some "grunt".

*I'd also like to add the constraint that the transformer and tubes must be reasonably readily obtainable!

What can you suggest?

Thanks

Doug
Hi,

It simply doesn't work like that, SE and grunt don't go together.
"may as well" being unrealistic, "readily available" is unrealistic.

Two tubes in push pull will do about 4 times as much power with
the same iron as a SE amplifier, you don't build SE's for grunt.

rgds, sreten.
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Old 28th May 2012, 12:10 AM   #17
6J6 is offline 6J6  Australia
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I guess if you lived in a cold climate, running a stereo 833A SE would work out about the same as a room heater for running cost and heat output, with the benefit of nice tunes too
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Old 28th May 2012, 12:35 AM   #18
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A medium solution is the 6C33. A 6C33 SET offer great sound, easy to find OP Transformer, and with 15 output Watts the tube last long time, if the amp had 2 power switches(one for heat the filaments, other for grid and plate).
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Old 28th May 2012, 01:18 AM   #19
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Why do you need so much power? If you want to build an SE amp there are several very good, well documented designs on this forum...my favorite is the KT88SE, do a quick search and check that one out...lots of people have built it and it is a very simple design...i think it is good for about 10 or so watts depending on your choice of running the tube pentode, UL, or triode....
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Old 28th May 2012, 01:26 AM   #20
rmyauck is offline rmyauck  Canada
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If you don't want the HV is paralleling 2 KT-88 any good? Or DHT tubes like 2A3. I think the JJ 2A3-40 are single plate. Can you use the same driver?

Regards,

Randy

Last edited by rmyauck; 28th May 2012 at 01:28 AM.
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