Carlsbro Cobra 90 Resistance

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N

nley

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Joined 2018
#1
Hi Everyone,
i'm new to this forum.
i'm Just sad that my amp which i long cherished has stopped working.
i have changed 2 fresh 2N3055 and 2 big caps, now just want to know the rating of R16,R17,R18 AND R19 as they look like wirewound ones and also where to get these parts.
please help..Thank you
 
#6
hi
Thanx for your reply,
i changed the 2N3055 cause the fuse was constantly blowing off when turned ON.
After changing those 2 transistors and the 2 4700uf caps, the fuse doesn't blow at all but No sound at all. R17,18 and 19 looks suspicious to me as they looked burnt on the outside.
Someone posted the schematic days ago and it helped me to locate those resistances.
Kindly let me know what you what can be the issue?
Thanks heaps, Have a good weekend.
 
#7
i changed the 2N3055s cause the fuse was constantly blowing off when turned ON,and since i did that together with the 2 Caps 4700uf, no more issues with the fuse except that no sound is coming out of the speaker.
speaker checked.
what do you think can be the cause?
Thank you for helping
 
#8
Carlsbro cobra 90 keyboard

hi,
please see attached circuit board and model of my Carlsbro cobra.
thank you for assisting.
 

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#9
"R22" value is 0.24 Ohms.

(The "K", "M", or "R" units-letter goes where the decimal point goes, so "R24" is point-two-four.)
 

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