I have this monoblocks and I want to make some improvement. I have here the schematic. I'm new here and I make my first steps in DIY now. .This amplifier have 14 db's NFB I want to reduce to 3db's or 0 . anyone can tell me where I can make this changes.
Sorry for this ,
any help will be welcome.
P.S - If you have ideias to improve this amplifier I apreciate all your help.
Thanks
Sorry for this ,
any help will be welcome.
P.S - If you have ideias to improve this amplifier I apreciate all your help.
Thanks
Attachments
RD6 is the global feedback set resistor.
The original value on the schematic is 27K but it is shown marked as 7K5.
This resitor works against RD4 (=136 Ohms) as a voltage divider to set the feedback level. 27K would give very little feedback, probaly in the 0 to 3dB range you wanted. 7K5 would give nearly 4 times as much feedback.
Try various values between say 4k7 and 47K till you get the sound you want, higher value gives less feedback, not as tight but more open sound.
You could also try deleting RD6 all together (no feedback) to see if you like that.
Cheers,
Ian
The original value on the schematic is 27K but it is shown marked as 7K5.
This resitor works against RD4 (=136 Ohms) as a voltage divider to set the feedback level. 27K would give very little feedback, probaly in the 0 to 3dB range you wanted. 7K5 would give nearly 4 times as much feedback.
Try various values between say 4k7 and 47K till you get the sound you want, higher value gives less feedback, not as tight but more open sound.
You could also try deleting RD6 all together (no feedback) to see if you like that.
Cheers,
Ian
Now I'm working in the monoblocks and I found this with the sleeve cables in bad shape, melting, I try to find in the net a similar to buy a new but nothing. I need help to identify this and apreciate a similar(the best if possible or some good brands to choose one) I only can read this:
Brey Gz in the other side EI 60. I put here some photos. Thanks for your help.
Brey Gz in the other side EI 60. I put here some photos. Thanks for your help.
Attachments
EI60 is just the frame size of the lams....
Its a choke of some description, the insulation of the wires can be replaced.
If its working OK, Why bother messing with it except to change the lead insulation?
looking at the schematic, its prob the 6.3 H choke in the +B supply.....
Is there any hum from the amp??--If not, Leave it alone!!
Its a choke of some description, the insulation of the wires can be replaced.
If its working OK, Why bother messing with it except to change the lead insulation?
looking at the schematic, its prob the 6.3 H choke in the +B supply.....
Is there any hum from the amp??--If not, Leave it alone!!
- Status
- Not open for further replies.