2SK1530 Bias
My aleph J with toshiba 2sk1530 is working, but the bias is to high.
The voltage drop at the source resistors doesn´t go lower than 550mV.
I use 2K potentiometers for bias and offset.
I also tried a 5K potentiometer for bias, but bias is still not getting lower.
The offset is allmost zero, but the temperatur is to high and i would prefer a voltage drop of 450mV as recomended.
My F5 is working fine with 2sk1530, 2sj201, so i didn´t expect any problems.
Do you have a hint what i have to do?
My aleph J with toshiba 2sk1530 is working, but the bias is to high.
The voltage drop at the source resistors doesn´t go lower than 550mV.
I use 2K potentiometers for bias and offset.
I also tried a 5K potentiometer for bias, but bias is still not getting lower.
The offset is allmost zero, but the temperatur is to high and i would prefer a voltage drop of 450mV as recomended.
My F5 is working fine with 2sk1530, 2sj201, so i didn´t expect any problems.
Do you have a hint what i have to do?
Yes, i guess some people successfully tried the toshibas in the aleph J, so eventually there is help here.
The point i didn´t understand was, with 2K pots i reached 550mV at the end of the range of the pots. So i thought 5K would help me, but the bias didn´t go any lower with them, their might be a limit here?
Haha, i could use some pc cooling vents on the amplifier and hope the toshibas will last.
Thanks for your help.
The point i didn´t understand was, with 2K pots i reached 550mV at the end of the range of the pots. So i thought 5K would help me, but the bias didn´t go any lower with them, their might be a limit here?
Haha, i could use some pc cooling vents on the amplifier and hope the toshibas will last.
Thanks for your help.
6L6 thats interesting, so i use a voltmeter for R27, to a least get the left and right channel at the same current gain?
Do i have to lower or to rise R27 to get lower bias, so that i just move the adjustment range of R8 in the right direction?
So i might for example use 50K or 100K for R27, if i don`t want to use pots.
Do i have to lower or to rise R27 to get lower bias, so that i just move the adjustment range of R8 in the right direction?
So i might for example use 50K or 100K for R27, if i don`t want to use pots.
Jim
This is the thing that bugs me about this circuit that I can't understand. I always thought that the bias of the output stage can only be determined by:
1. The value of R7 and the current flowing throught it via Q1
2. The current flowing through Q3
My understanding is/was that the CCS only regulates current through the output stage as the current demand changes.
This is the thing that bugs me about this circuit that I can't understand. I always thought that the bias of the output stage can only be determined by:
1. The value of R7 and the current flowing throught it via Q1
2. The current flowing through Q3
My understanding is/was that the CCS only regulates current through the output stage as the current demand changes.