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Old 18th December 2011, 05:38 PM   #11
mayky is offline mayky  Hungary
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Quote:
Originally Posted by Charm View Post
Thanx. I-Zero and P-zero.
I have some russian tubes too 6Ф3П, winged logo C the original Svetlana
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Old 18th December 2011, 11:03 PM   #12
Jebem is offline Jebem  Portugal
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Hi Mayky,

The AN P-Zero mono blocks delivers 8 Watt each from a pair of ECL82 tubes, where the pentode sections runs in ultra linear (20% taps) push-pull output stage, and one triode section acts as input amplifier and the other triode acts as a phase splitter (but I think they use a driver transformer for this job).

So this is a simple, well understood, and widely available schematic in the internet, BUT with a few variants.
AN UK design is very specific in the way they tap the primary output transformers at 20% to connect the screen grid to get the most power and low distortion from the tubes in class AB2 (I don't think they can take 8 Watt in class AB1, so I believe they use a drivers transformer to run them into class AB2.).
Most of the transformers are tapped at 43% as this is a more common value.
The primary impedance should have a minimum of 9Kohm.
Also our own site refers to this issue before, here:
ECL82 (6BM8) PP Stereo

ecl82_3.gif

circuit-2-big.png

ecl82_1.gif

So, You really need the correct driver and output transformers to get the most from your tubes and reach the specified power and distortion.
I believe AN in UK will be happy to sell you the transformers and the schematics as well, I'm sure.
http://www.audionote.co.uk/articles/reviews/ANote.pdf
http://www.audionote.co.uk/downloads.../an_p_zero.pdf

Also you may like to check this transformer manufacturer in UK:
SOWTER AUDIO TRANSFORMERS
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Old 27th December 2011, 05:52 PM   #13
mayky is offline mayky  Hungary
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Thanx for infos.
The output transformers will do it by myself.

Here is one bobin, this is unloaded ratio. The loaded (wire DC resistance, etc) more than 9k.

This bobin is suit for M85B core, it's about 12-13 cm2
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Old 3rd May 2012, 08:23 PM   #14
mayky is offline mayky  Hungary
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Well I made a test model PCL82 PP. I made some square wave test. I've got this results.
The frequencies:

100Hz, 1kHz
10 kHz, 20kHz
40 Khz, 80 kHz

My audiogenerator is not perfect, but essence is viewable
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File Type: jpg mérés.jpg (114.7 KB, 115 views)
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