A balance control, properly implemented, can ensure proper image centering regardless of tube aging/gain differences, without the need for GNF. By properly implemented, I mean using dual volume controls, such as with autoformers.
How would such an argument proceed?fdegrove said:
Feedback, whether local or global, will reduce gain variations with ageing. "Guarantee equal gain" is an absolute statement which is of course false, but 'ensure similar gain' could be true.
Yes. It continues to amaze me that some people avoid CF due to some perceived problems, yet continue to use much more distorting circuits quite happily.
So, if i decide not to make great changes, what is it better, to leave the tube on or change it with a resistor?
In answer to the first question about global feedback distorting imaging both channel would have to be distorting in exactly offsetting way adding global feedback correct the distortion and shifts the image because the offset is no longer there. Play the lotto your odds of winning are much higher than meeting that scenario. Given I am not a fan of global feedback local feedback is another story don't pitch the baby out with the bath water so to speak.
Just build the 6n6p in SRPP. Configurate the I/V resistor of the PCM1798 that it will generate about 180mV. Then you have about 2V at the output.
I use this output for several years with my shanling cd-t100 se cd player. And it is the best outputstage i heard. This output stage measures not the best but the sound i like. There is no noise or humm just a simple CRCRC power supply.
I use this output for several years with my shanling cd-t100 se cd player. And it is the best outputstage i heard. This output stage measures not the best but the sound i like. There is no noise or humm just a simple CRCRC power supply.
Hi,
Assuming you now have an SRPP circuit of some sorts, changing the top triode for a anode resistor will change the circuit completely.
Also, I don't quite understand why you would tap the signal off the anode of the bottom triode instead of the lower impedance output present at the cathode of the top valve.
In fact nobody has any idea what this circuit is doing right now so it's hard to advise until we know more.
Ciao, 😉
Assuming you now have an SRPP circuit of some sorts, changing the top triode for a anode resistor will change the circuit completely.
Also, I don't quite understand why you would tap the signal off the anode of the bottom triode instead of the lower impedance output present at the cathode of the top valve.
In fact nobody has any idea what this circuit is doing right now so it's hard to advise until we know more.
Ciao, 😉
- Status
- Not open for further replies.