schismspeak
11-01-05, 01:19 AM
I managed to burn up the transformer in my guitar amp(Not a toroidal transformer). It was still too hot to touch about 15minutes after the amp quit.(I did not smell any burning smell which is why I did not catch it.) I believe a bad(shorted) instrument cable was the cause. Now I need to figure out what voltage this amp requires whether it be 12, 14, 18, 24-25, 48, 55 or 70v. It is supposed to be a 30 watt amplifier(Solid state), the transformer has no voltage markings whatsoever(but has T33x66 on the bottom, which brought nothing up in google.), it has the black and white ac leads input and two red and one black(center wire) output(which makes me 'think' it is a center tapped transformer) that plugs into the PCB. The PCB has no voltage input markings but has many 16v 25v and 50v caps(quite small), along with two quite larger 35v caps.(along with all the other ic's etc) I don't know if that helps or not though. Also I'm thinking it is possibly a line matching transformer.(Though I really don't know if that would work when going through everything on the PCB, then to the speaker, it confuses me.)
I can power the PCB with a 12v ac/dc adapter, however the leds are quite dim and it takes a second for them to light up, with an 18-20v ac/dc adapter it powers up fairly quick(but probably takes 2-3x as long as it should), but with both of these, no sound will come out of the speaker when the guitar is plugged in.(possibly because of no negative voltage, which I believe is what a center tapped transformer has, IE, 16v-0v-16v (is that to be read as negative 16..? :shrug: I do not know for sure, alot of what I have read is not really specific.. ) However the speaker does pop with the 18-20v one, just like it did when turned on when it was working properly.(but instead of doing this near instantly it takes 2-3x as long, as I said before.)
Most of these(the transformers) look very similar to what is burned up, however some of the have only two output leads.
http://www.partsexpress.com/webpage.cfm?&Webpage_ID=3&DID=7&CAT_ID=59&ObjectGroup_ID=182&SO=2
http://www.partsexpress.com/webpage.cfm?&Webpage_ID=3&DID=7&CAT_ID=45&ObjectGroup_ID=329&SO=2
Sorry this is so long, I just wanted people to have as much info as I possibly could give.(If I missed anything just ask.)
If anyone knows of any other forums(or person!) that may be of more help to me, please let me know. :)
I just don't want to have to buy a new amp($100+) if I don't have to which I really don't believe I do!
THANKS!
I can power the PCB with a 12v ac/dc adapter, however the leds are quite dim and it takes a second for them to light up, with an 18-20v ac/dc adapter it powers up fairly quick(but probably takes 2-3x as long as it should), but with both of these, no sound will come out of the speaker when the guitar is plugged in.(possibly because of no negative voltage, which I believe is what a center tapped transformer has, IE, 16v-0v-16v (is that to be read as negative 16..? :shrug: I do not know for sure, alot of what I have read is not really specific.. ) However the speaker does pop with the 18-20v one, just like it did when turned on when it was working properly.(but instead of doing this near instantly it takes 2-3x as long, as I said before.)
Most of these(the transformers) look very similar to what is burned up, however some of the have only two output leads.
http://www.partsexpress.com/webpage.cfm?&Webpage_ID=3&DID=7&CAT_ID=59&ObjectGroup_ID=182&SO=2
http://www.partsexpress.com/webpage.cfm?&Webpage_ID=3&DID=7&CAT_ID=45&ObjectGroup_ID=329&SO=2
Sorry this is so long, I just wanted people to have as much info as I possibly could give.(If I missed anything just ask.)
If anyone knows of any other forums(or person!) that may be of more help to me, please let me know. :)
I just don't want to have to buy a new amp($100+) if I don't have to which I really don't believe I do!
THANKS!