Hello,
Im bulding my Aikido line stage. PCB is ALLinONE LSA/HSPA. I will use 6CG7/6H30 for line stage. B+ will be 300V. I have troubles with R10 resistor.
If I look in table are there R10=82,9k for 6CG7/(B+300V/7,3mA) and R10=76,5k for 6H30/(B+300V/15mA). Now what to chose? For inpute tube or outpute tube? And there is also formula R10=R9( (mu-2)/(mu+2) ). But once again witch mu to use? For input or output tube or maybe both???
Please guys be so nice and help me.
BR,
Goran
Im bulding my Aikido line stage. PCB is ALLinONE LSA/HSPA. I will use 6CG7/6H30 for line stage. B+ will be 300V. I have troubles with R10 resistor.
If I look in table are there R10=82,9k for 6CG7/(B+300V/7,3mA) and R10=76,5k for 6H30/(B+300V/15mA). Now what to chose? For inpute tube or outpute tube? And there is also formula R10=R9( (mu-2)/(mu+2) ). But once again witch mu to use? For input or output tube or maybe both???
Please guys be so nice and help me.
BR,
Goran
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Your schematic doesn't have the parts designators. But assuming these are the resistors in the series noise nulling circuit, the mu is that of the White cathode follower (second tube).
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I'm building the same setup for a friend.
Did you go for a separate heater transformer? That combo needs loads of heater current!
I'm building the same setup for a friend.
Did you go for a separate heater transformer? That combo needs loads of heater current!
Yes I know. I will go for separate. How much current do you think is optimal for heater transformer?
BR,
Goran
I'm in the process of building an Aikido (point-point wiring).
The heater current rating needs to easily exceed the draw of 4 tubes that have heater currents equal to the highest of the bunch. Typically, that's 0,6A per tube at 6.3v. So 4*0,6A=2,4A. You would need a 3 Amp rated transformer or higher.
Gary
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