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Old 27th July 2007, 01:31 PM   #11
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Join Date: Mar 2005
Location: Bergamo
Quote:
Crocodillo: IS the CCS with low mu output the same as a mu-follower?
I call it in that way but it is not correct, actually.
The CCS is made in a way that it keeps the current flowing through the tube constant, while delivering a variable current to the load.
THIS is the schematic.
Note that I already tried it (with different values and different transistors), and it works flawlessy.
Being the current through R2 constant, we have no signal across it (its voltage is always constant).
The only BIG drawback is that it needs a floating supply; my idea for the amplifier is to use two really small PCB transformers (about 2-3W) powered directly from the main.

Ciao,
Giovanni
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Old 28th July 2007, 06:24 AM   #12
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Default Reduce current, increase voltage

Hi, according to the 6N6 datasheet, 160V/20mA will deliver max.
200Vp-p as you suggested.
220-250V Ua-k across the upper tube and 10-12mA will do the job. I haven't tried it with 6N6, but with the 5687 which is similar, it gives more than 300Vp-p with less than 3% 2nd harmonic (choke load, must be the same with CCS).

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Konstantinos
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Old 15th September 2007, 09:33 AM   #13
cjng74 is offline cjng74  Malaysia
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can anyone share the characteristic graph of 6AS7G or 6080?
the current graph only limit to B+ of 200 or below.
thanks.
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