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Old 29th January 2013, 05:49 PM   #11
Cassiel is offline Cassiel  Libya
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I don't understand why you want to drop the voltage down to 280V. Too shy for the EL84. Just drop the current, and I don't think you will get 360V by the way, 340V more likely. Transformer losses.

There should be a prize for whoever gets the voltage right - don't forget to say.
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Old 30th January 2013, 07:08 AM   #12
Tesla88 is offline Tesla88  Italy
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All rectifiers have a certain voltage drop or loss, but it does not depend on rectified voltage.
It certainly does not take 40% of peak voltage !!!
Ok, don't want to be annoyng but , look at some datasheet of the EZ80 , with a 275 - 0 - 275 transformer you get 280Vdc , this is voltage at 90mA , I don't know exactly how much current the OP project need , but with an EL84 and some 12ax7 i think it need at least 60mA , voltage drop is due to tube rectifier loaded and the anodes limiting serie resistors , i expect a B+ voltage around 300-320Vdc

Just don't drop this voltage anymore with CRC networks , expecially for the power stage cause it takes 40-50mA and you need a power resistor to drop voltage at this current and a waste of power when if you apply direct voltage to EL84 stage you get more power and probably a better sounding amp , if you want to drop voltage for preamp stages is ok , they takes few mA and you get a more "hum-free" preamp ...

Anyway , do what ever you want , amp is your
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Old 30th January 2013, 07:10 AM   #13
Tesla88 is offline Tesla88  Italy
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There should be a prize for whoever gets the voltage right - don't forget to say.
How much ? I'll have a bunch of EZ80 at home and some transformer to test !
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Old 30th January 2013, 01:26 PM   #14
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Ok,ill take B+ for the poweramp,and do a voltage drop for preamp
With B+ at 300V i could get around 6W output,so i will leave like that...
Thanx guys This help means a lot to me!
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