stevem Messages: 4743 Registered: June 2004 Location: NY
Senior Member
Are the cables to the tank good?
If the outside of the circuit board mounted rca jacks are not shinny, then they may be tarnished enough to not make good connection.
If you do not hear the tank crash when you bang it around then you have a bad cable feeding the recovery/ return amp , or a problem with the recovery / return amp itself.
This assumes that your test out of the tank was good, meaning the resistance reading of 175 to 185 ohms on each end of the tank!
The reverb pot on each channel are just sends and do not have to be turned up to hear the tank crash.
Pull the bulb out and check the number. It might be the wrong bulb, or it might need a little treatment from your emery cloth. There is a large power resistor in series with the socket that connects to chassis ground. Check to see that it is 200 ohms.
irish77060 Messages: 49 Registered: January 2017 Location: Atlanta, GA
Member
Good advice, since the next one I opened K200B-1 also had the incorrect one. I will just order 5 and replace them all.
Now, for good news!
K200B-1, first of two. No power, bright side.
Pulled amp, and saw where some bonehead many years ago spilled his beer into the amp. I thought, oh crap, this could be bad. And, someone had replaced the rectifier.
However, I did a thread forum search and found a couple of threads with the same issue on the 200. I think you and Steve both chimed in. So, I followed those directions and this puppy is loud and proud. I replaced the cord with a grounded one, removed the cap by the power cord attachment, and tested. Perfect.
irish77060 Messages: 49 Registered: January 2017 Location: Atlanta, GA
Member
One more question on the K100B-5 PA amp. On the back, there are the two speaker jacks on the left. And the fuse pod.
On the right upper portion, there is a 1/4 jack, and on the bottom right a toggle switch. I am told the right side jack is for a foot switch that turns the reverb off. However, the toggle switch does this. .??
If you are saying that there is an external fuse holder, then that has been added sometime in the past just like the switch.
If you look at the backside of the switch, you can follow the wires and see what they are connected to. If they connect a wire from the middle mixer/reverb board to ground, then it is replacing the footswitch jack.
What does the jack on the upper right side connect to? If it connects to the power amp board it is the monitor output jack.