To calculate the critical value, your B+ voltage and choke resistance is needed. Also nice would be minimum and peak current.
Critical value increases as current drops, for the choke to drop your B+, x amount of current must always be drawn. This isnt an issue in class A, and not a big one in typical ~70% rich class AB hifi. You may need bleeder resistors to insure choke criticality in some cases though.
Critical value increases as current drops, for the choke to drop your B+, x amount of current must always be drawn. This isnt an issue in class A, and not a big one in typical ~70% rich class AB hifi. You may need bleeder resistors to insure choke criticality in some cases though.
Sure.
http://www.audiotropic.net/WillsAmp/powSchem.gif
The amp is well explained here:
http://www.audiotropic.net/WillsAmp/
My power supply is not dual mono and i will use another rectifier, apart from that i'm building the same amp.
Stalker,
I guess I am confused the schematic says 100 mA... you have purchased 100 mA (2 pieces... one for each channel).
Where is the problem?
😕
EDIT:
Ah Ha... are you using one power supply instead of 2?
I guess I am confused the schematic says 100 mA... you have purchased 100 mA (2 pieces... one for each channel).
Where is the problem?
😕EDIT:
Ah Ha... are you using one power supply instead of 2?
Poobah,
My power supply is not a dual mono. I am using only one power transformer and one rectifier. That schematic confused me as well...that's why i have now a 100mA 10 H choke.🙂
My power supply is not a dual mono. I am using only one power transformer and one rectifier. That schematic confused me as well...that's why i have now a 100mA 10 H choke.🙂
I have two PTs. Initially i bought the Hammond 370HX because i was going to use silicon diodes but then i changed my mind and decided to go tube rec so i bought a nice power trafo from an old tube radio shop here in Madrid. The transformer gives exactly the same voltages as the schematic posted, it has plenty of current available, i have tried it in another circuit with 6AS7s (160mA) and worked great...warm not hot to the touch.
If i am to use the Hammond i willl have to change many things, recalculate values...the Hammond looks better though...
What's your suggestion?
I really don't like the dual supply approach because i don't want the chassis to be too large.
If i am to use the Hammond i willl have to change many things, recalculate values...the Hammond looks better though...
What's your suggestion?
I really don't like the dual supply approach because i don't want the chassis to be too large.
OK,
Now that I understand the problem is simple:
1. You must build 2 of the circuits from the inductor point forward. So 2 inductors, 4 82 UF caps, 2 - 2.2K reistors.
2. Connect the second circuit at the 1uF capacitor (same as pin 8 of 5y3.
You are using the 5Y3 at the limit... no problem... just no more!
All is well.
Now that I understand the problem is simple:
1. You must build 2 of the circuits from the inductor point forward. So 2 inductors, 4 82 UF caps, 2 - 2.2K reistors.
2. Connect the second circuit at the 1uF capacitor (same as pin 8 of 5y3.
You are using the 5Y3 at the limit... no problem... just no more!
All is well.
Critical inductance at 70ma for each choke in your circuit is a bit less than 5H, youd be just fine with 2 10H 100ma chokes.
Well,
Tweeker gets the savante award; his math was brilliant and witty. He could not, however, count his pictures (you don't even need to take off your shoes for 2).
Tweeker gets the savante award; his math was brilliant and witty. He could not, however, count his pictures (you don't even need to take off your shoes for 2).
Hi poobah,
My post had 13 words in it. He didn't count my name.
Still, the math was cute.
-Chris
My post had 13 words in it. He didn't count my name.
Still, the math was cute.
-Chris
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