Hi, i was just playing with the bias circut when the cordell output correction idea cae to mind.
In this case i was looking for a "simple modification" that makes sense.
At first comparing to resistor bias or fixed bias...
Could it bee that this current driver drive 😉 ?
This simple bias with error correction ? Any comment ?
Bias current abt 7mA.
In this case i was looking for a "simple modification" that makes sense.
At first comparing to resistor bias or fixed bias...
Could it bee that this current driver drive 😉 ?
This simple bias with error correction ? Any comment ?
Bias current abt 7mA.
Attachments
Last edited:
This amplifier has a set of features that makes it very interesting to use. I mean low parts count, very fast, small distortion and a very interesting compensation arrangement.
I and others will appreciate your complete simulation file with parts models to start a discussion of possibles improvement to achieve better overall performance. 😉
If you have a little time, have a look in Onkyo M-504 and Marantz M-700 (Monoblock to HT) that uses exactly the same Voltage Gain circuit topology with other solutions to other market places. Both uses bipolar output stage with triple Darlington transistor and perform very well in simulation and listening sections. More complex schematics and parts count.
Ronaldo
I and others will appreciate your complete simulation file with parts models to start a discussion of possibles improvement to achieve better overall performance. 😉
If you have a little time, have a look in Onkyo M-504 and Marantz M-700 (Monoblock to HT) that uses exactly the same Voltage Gain circuit topology with other solutions to other market places. Both uses bipolar output stage with triple Darlington transistor and perform very well in simulation and listening sections. More complex schematics and parts count.
Ronaldo
Hi, tnx reply.
Sorry I was not clear in my last post.
I was looking / checking for an easy to implement linearisation in the bias circuit without using predrivers. Maybee simplified Cordell ??
As modification is al abt using as much as possible of existing values and making the litle tuch of extra that MAY make it worth to grab the soldering iron one more time.
My goal was to make a simplified R.Cordell front out of a Telios, Kenwood L05/L07, MP150 or in my case a Goldmund 6 that needs reap. And ot damage the performance to the already good circuit.
Here is my crazy idea after looking at som Telios boards:::
Attachments
I had a look in your simulation files. I think you are going to a new project, so I am sending you other simulations files to your analises.
Thank you for your time and attention:
Marantz MA-700, but I do not like the original compensation values.
Onkyo M-504 that uses a small transformer to improve OS crossover distortion.
Both simulation files was based in service manual.
Regards/Ronaldo
Thank you for your time and attention:
Marantz MA-700, but I do not like the original compensation values.
Onkyo M-504 that uses a small transformer to improve OS crossover distortion.
Both simulation files was based in service manual.
Regards/Ronaldo
This simulation files are from Hitachi HA6800 that looks very similar to your simulation file given best results. The diference between these files is the DC servo schematic.
I really hope it help you in any way
Ronaldo
I really hope it help you in any way
Ronaldo