If there are no other suggestions I will finish up some of my other projects. Thanks for all your insight.
It was a learning experience.
Not a bad sounding amp in the end.
Dimitri has some nice equipment. Thanks for the boards.
Sigurd is very gererous.
PMA knows alot more about amps than me.
John Curl can be helpful.
Time to move on to other projects
Not a bad sounding amp in the end.
Dimitri has some nice equipment. Thanks for the boards.
Sigurd is very gererous.
PMA knows alot more about amps than me.
John Curl can be helpful.
Time to move on to other projects
Hi All
Would anyone please tell me if it is ok to eliminate the 5uF input capacitor as my JC-2 clone pre-amp already has a 2uF coupling capacitor at it's output.
Thanks
Would anyone please tell me if it is ok to eliminate the 5uF input capacitor as my JC-2 clone pre-amp already has a 2uF coupling capacitor at it's output.
Thanks
yes, but you run the risk of putting the amp together with a source that has DC offset or output, then poof! Well maybe not poof, but you could develop some serious DC output from the amp... better to be safe than sorry.
_-_-bear
_-_-bear
bear said:
Hi bear
For safety purpose I think the input cap is necessary. There was an accident. I damaged one of my JVC woofer last week when I by-passed the output cap of my JC-2 clone pre-amp and now it needs re-cone service. But without the output cap which is a 2.2uF Wima MKP10 I feel the sonic quality of the pre-amp sounds better. The sound is more natural with no coupling caps.
Best Regards
john curl said:
Hi Mr. Curl
Thank you for your prompt reply again.
It is a good idea to add servo. It would be great if you can send me the schematic.
By the way, does a 500VA 25V x 2 (this is the closest voltage I can source from Farnell & RS) toroid transformer good enough for one channel?
Best Regards
My pcb layout of John Curl's JC-3 power amp base on original circuit published except I eliminated the 5uF input capacitor as my JC-2 clone pre-amp already has an output cap.
JFets at the input stage will be 2SK170BL/2SJ74BL
Power transistors will be MJL3281/MJL1302 and the rest MJE15032/MJE15033. These transistors will be mounted on heat sinks.
Size of pcb is 5 x 3 inches.
JFets at the input stage will be 2SK170BL/2SJ74BL
Power transistors will be MJL3281/MJL1302 and the rest MJE15032/MJE15033. These transistors will be mounted on heat sinks.
Size of pcb is 5 x 3 inches.
This amp should not be built to this schematic. There are improvements to be made. John has given hints along the way. Dimitri also has some improvements. It will no longer be a JC-3 but will sound better.
MikeW said:This amp should not be built to this schematic. There are improvements to be made. John has given hints along the way. Dimitri also has some improvements. It will no longer be a JC-3 but will sound better.
Hi Mike
Thank you for your comments.
Do you have the final schematic for me to study before I go ahead to make boards?
Best Regards
