Recently aquired an Acoustic G60-212 combo amp and need some advice on servicing.
The amplifier & cab are in reasonably good condition.
The amp powers up and both input channels work.
The cabinet has a pair of Celestion G12M-70 16 ohm speakers.
Tone of the amp is great and it responds well with or without effects pedals.
Upon closer inspection and removal of the chassis from the cabinet for cleaning 4 items of concern were discoverd.
1- The two 16 ohm speakers were wired in series presenting a 32 ohm load to the power amp (which to me is ridiculously high).
2- The ground prong on the line power input cord had been broken off (easy reapir).
3- The ceramic capacitor on the main input power to the transformer had one of its leads clipped or broken.
4- The solder mount output fuse on the power amp board was blown and had been bridged with a pice of wire. (fuse value appears to be 4amp250V quick blow).
#1 What is the correct "normal" load for this amp to see? I'm assuming an 8 ohm load with the two 16 ohm drivers in prallel would be normal.
#3 The ceramic filter cap that had its lead clipped is for line noise supression and should be put back/landed to its terminal?
#4 Is the value of the amplifier output fuse correct and was the high impedance responsible for blowing the fuse?
I have relocated the power amp ouput fuse to the rear panel of the chassis next to the external speaker jack for easier access.
The original board mount fuse is a pain in the ass to check and change.
Will the reverb only function when a foot switch is used?
The "volume " jack would control the master volume with a pedal operated pot?
What is the minimum load that the external speaker jack must see if an external cab is used?
Does the external speaker jack switch the two 12" drivers in the combo cabinet "off " and load the power amp only on the external cabinet when used?
Thanks in advance for any help