HELP With VOX AC100CPH

[angelothewolf]

http://www.ampix.org/albums/userpics...x_AC100CPH.pdf

Hi everyone!! ive got this VOX AC100CPH wich suffer some of those ^worst than before^ repairs.

the amp came up with a very low output and stuck in the dirt channel. some hours later i get the schem and i realise that the TCN207 - CON7 / TCN9 - CON9 connections were inverted,  so, the TCN9 with the TCN207 & the CON7 with CON9.

after connecting everything in the right way the amp came to life again, sounds loud and the channel switch does his job too. BUT! an intermitent loud poping sounds appeared. so, its being difficult to get to the source of the POP. i try with new valves and the problem persist, all the voltages on the schem are normal. i think its an preamp issue couse trhough the return the pops goes away.
today i got an oscilloscope so a little tips would be very appreciated!!

[angelothewolf]

anyone__??? 

[SeanB]

IC209,204 looks like a good candidate for having been crisped by 200V on the input, from the reversed connectors. Capacitors C205,206,217 are also candidates for having broken down. Disconnect con7 and see if the noise goes away ( output will go away as well, but the click should go as well) and if so do a blanket replacement of the components.

[angelothewolf]

IC209,204 looks like a good candidate for having been crisped by 200V on the input, from the reversed connectors. Capacitors C205,206,217 are also candidates for having broken down. Disconnect con7 and see if the noise goes away ( output will go away as well, but the click should go as well) and if so do a blanket replacement of the components.

 disconnect con7 and the noise remains the same, disconnect con7 and con9 and the noise still there. that means that the problem is not in the preamp stage>? when i disconnect CON16 the noise goes away!...   
when i pull out the first pre tube the noise disapears too....

thanks for the replies!!