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Old 18th November 2010, 10:29 AM   #1
mik190 is offline mik190  Russian Federation
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Default Look for Single Tube scheme

Hi

I want to build single tube amplifier. Not like ECL82, when there is triod and pentode in one, but real single stage. It have to be like this in my mind:

input transformer--->tube--->output transformer.

Did anybody make sumething like it?

2W output at 8Om will be anough.

As compromise integrated tubes triod+triod is possible (2 stages).
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Old 18th November 2010, 01:33 PM   #2
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How much output power? What will drive it? A step-up input transformer can provide some voltage gain but will be proportionally harder to drive. A dual triode like 6EM7 (common in MY basement...) will do one watt with PLENTY of gain.
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Old 18th November 2010, 01:44 PM   #3
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My current amps are single tube monoblocks(EL84), but I guess that's not what you mean. And to be fair: they also have a rectifier tube..
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Old 18th November 2010, 02:18 PM   #4
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You can do it with high GM triodes like the super expensive 437A or the russian 6C45 which is much more reasonable. These tubes don't even need a step up transformer. There are plenty of pentodes too, 12HL7, 6AG7, 6CL6, 8608, etc etc.
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Old 18th November 2010, 02:53 PM   #5
tinitus is offline tinitus  Europe
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ecc99 ?

I suppose it goes without saying that such amps are usually driven with a high gain tube pre ?

there is this one with EML tube, but expencive
http://www.tubeaudiolab.com/id148.html

el84 driving el84 I suppose is only half way there
http://home.comcast.net/~jafix/SakumaEL84.html
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Old 18th November 2010, 02:58 PM   #6
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I have once seen an amplifier done with a single Russian 6J52P, but can't unfortunately find the link anymore. However, it should not be a top engineering project to design such amplifier. 6J52P has very high gm - 55 mA/V - and max. anode dissipation is 10 W. So these features seem to be very suitable to single tube configuration.

I would try to make it with simple cathode bias and without input transformer. One suitable output transformer would be Hammond 125 ASE.
It has plenty of primary and secondary taps to find the best load impedance for the tube.
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Old 18th November 2010, 03:07 PM   #7
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Old 18th November 2010, 03:23 PM   #8
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abraxasaudio Tube Amplifiers
The 6CL6 with a 8K load does great, and is good for almost 3 watts out.

Hawthorne audio sells a modded kit based on this design.
JerryCurtis Dot Com The Spud Kit

B+ around 300V with about 165V on the screen and around 30 mA through the tube.
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Old 18th November 2010, 04:35 PM   #9
banat is offline banat  Serbia
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Quote:
Originally Posted by mik190 View Post
Hi

I want to build single tube amplifier. Not like ECL82, when there is triod and pentode in one, but real single stage. It have to be like this in my mind:

input transformer--->tube--->output transformer.

Did anybody make sumething like it?

2W output at 8Om will be anough.

As compromise integrated tubes triod+triod is possible (2 stages).

Here is Minimalistic Single Tube Set Amp project for You,but with only 1,2W output power.

And here is the link for same project:6S45P-E SE Amp

Best Regards
Attached Images
File Type: gif 6S45PE Schematics Web 1.test.GIF (9.7 KB, 796 views)
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Old 18th November 2010, 04:45 PM   #10
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Take one 6Ж52П, and you don't need input transformer. Or, one 6П14П with input transformer.
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