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Old 28th July 2004, 02:38 AM   #11
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Thanks Guys
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Old 28th July 2004, 03:50 PM   #12
Mike L. is offline Mike L.  United States
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Quote:
The simplest valve amplifier i have come across is based on the 6S45PE (6C45piE in cyrillic) triode for a whopping 1400mW(!) of power. I know this is a rather, no VERY limited in SS circuitry but some of the most expensive, rare and coveted valves only produce about that much power single ended. Fortunately this valve isn't rare and can be had pretty cheaply.
Where is this valve available. I can't seem to find any reference to it at any of the usual sources in the U.S..

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Old 28th July 2004, 04:18 PM   #13
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Hi,

Quote:
I can't seem to find any reference to it at any of the usual sources in the U.S..
No idea if this counts as such...........:

UNCLE NED'S TUBE STASH...

Cheers,
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Old 5th August 2004, 10:37 PM   #14
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by audiousername
The simplest valve amplifier i have come across is based on the 6S45PE (6C45piE in cyrillic) triode for a whopping 1400mW(!) of power. I know this is a rather, no VERY limited in SS circuitry but some of the most expensive, rare and coveted valves only produce about that much power single ended. Fortunately this valve isn't rare and can be had pretty cheaply. See http://digilander.libero.it/paeng/projects_frame.htm and click on ST-AMP under the power amplifiers heading in the left frame. I have attached the schematic to the amplifier below... the red circled bit is the signal circuitry - 6 parts! - I believe this is less than most of the the gaincard/gainclone amplifiers. More power can be had by paralleling these valves, or arranging them in push-pull (more complicated) - I had some schematics for these... i will post them later when i find them.

Interesting little amp. If you were to build this thing, would you use separate LC stages for each channel? Looks like one PS for both channels in his schematic.

Sheldon
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Old 6th August 2004, 11:21 AM   #15
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For a similar amp - and one that has been tried and tested by several people around the world - see

The Great El Spuddo!

My last iteration used Mundorf Supreme caps in place of the Russian paper items.

BTW The Krklec OPT referred to is no longer available. I would now recommend a 2k5 or 3k5 unit, the lower impedance seems to give a sweeter sound.

Brian.
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Old 6th August 2004, 02:41 PM   #16
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by Brian Clark
For a similar amp - and one that has been tried and tested by several people around the world - see

The Great El Spuddo!

My last iteration used Mundorf Supreme caps in place of the Russian paper items.

BTW The Krklec OPT referred to is no longer available. I would now recommend a 2k5 or 3k5 unit, the lower impedance seems to give a sweeter sound.

Brian.
Cool, even more ideas.

Thanks,
Sheldon
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Old 6th August 2004, 08:41 PM   #17
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How about the "Cookiebox"

http://www.mcamafia.de/tubes/keksdose/cookiebox.htm
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Old 6th August 2004, 08:53 PM   #18
BrianGT is offline BrianGT  United States
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Is there a decent tube design that gives about 20-30w, and isn't too difficult for a first time tube DIYer?

Is this design any good?
http://www.lundahl.se/claus_b.html

Or for a lower powered design:
http://www.lundahl.se/claus_b_se.html

I know very little about tube amps, but want to build one to compare. The above amps were the first one I stumbled on through google.

Also, the above amplifiers use output transformers. The SE one is specified as 8w/8 ohm. Will this cause problems if my speakers are 4 ohm? The output transformer doesn't appear to have a 4 ohm tap.

--
Brian
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Old 6th August 2004, 09:20 PM   #19
G is offline G  United States
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Hi Brian. Gonna try some tubes huh? You should have no problem from what I have seen of your SS amps. I have a SE EL34 that I built and I could send you the schematic. Actually it's probably on this site. The big question is do you have the sensitive speakers that are required for low power tube amps. If not you may have to do a PP amp which is a little more complex but certainly should be no problem for you to build either. Decide on the minimum power requirments for the speakers you have and go from there.
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Old 7th August 2004, 10:25 AM   #20
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This one is also fairly simple ... 6 parts + a tube + OPT per channel plus powersupply...

http://www.t-linespeakers.org/tubes/SEP_50EH5.html

a whopping 1.4 W ... not much bass with the tiny OPTs (but someone did build the $405 version -- ie add $400 of Lundahl iron, and reported that it sounded very good).

You could get the parts count down to 4 or 5 parts if wired in triode... maybe even 3 if you lost the cathode bi-pass (but now you are down to 500 mW or so). Maybe even lose the grid stopper... now its 2 resistors per channel ... i think i'll have to try that :^)

Click the image to open in full size.

dave
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