Did RCA plug short cause channel loss on Super-T amplifier?
I put a DIY interconnect on the Super-T amplifier. The plug shorted as the screw down for the center connector rotated and made contact with the barrel when I installed the plug. The channel stopped working when I installed the plug and no longer works. A change of interconnects does not help. Could the shorted plug have caused the channel to fail?
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If I can read you right you are saying that the device keeps blowing the fuse?
Fuses blow when there is an overload. As it is an amplifier we are dealing with the cause is more than likely a shorted output transistor or more than one, or whatever does the main amplification for the device. These devices are located on the main power amp board attached to a heat sink. If the amp has fuses for each channel then you only need to replace the devices on that channel, with the fuses blowing on it. The cause of shorted devices is often bad speaker wires or them touching.
Let's review the setup procedure and precautions. This is for bridging the amplifiers within a single box.
The mono-stereo-bridge switch must be in bridge position
The input signal must be connected only to Channel 1. NOTHING should be connected to Channel 2.
The Channel 2 level control should be turned all the way down. Turning it up will amplify common-mode noise.
The + speaker terminal is connected to the red binding post for Channel 1 and the - speaker terminal is connected to the red binding post for Channel 2. Neither side of the load should be grounded.
There are no connections to the black binding posts. They should not be grounded or shorted together.
It does not seem practical to bridge or parallel two MT 1200 boxes; it
would be very difficult to get the levels and offsets precisely
matched. If they aren't matched, you will get oscillations or common-mode amplification - that is
your humming noise.The bridging switch makes six changes to the circuitry to get the
amplifiers properly interconnected in one box so this won't happen in the
Unfortunately there is little we can do directly. The output transistors are likely to be shorted on the bad channel. This is not a DIY repair for most people. Expect a repair bill in the $80 range for parts.
The jumpers must be in place for tthe internal amplifiers to use those channels. Removing them allows you to feed external amplifiers to drive those channels. Lacking the original jumpers just place some short RCA cords in.
Most likely the thermal protection device is tripping due to a short circuit. Under a no load condition this is usually caused by one of the power amplifier transistors being shorted internally or a bypass capacitor shorting internally. One would have to test the components to determine the source of the failure.
The only way this could happen is either the wires touching or a capacitor overheating and shorting out, Also hardly bumped or dropped would cause loose solder connections. Wich you should check eitherway
The output device on that channel will have blown. Look at the output device for that section by following the leads back from the plug, Anything with a heat sink on it is the best bet for the fault.
This could be caused by a few things. The cable could have a short in it so try it out on a different guitar. If it works the jack on the guitar could have a loose solder joint. This is usually caused by putting stress on the cable and causing the jack to move.