| Re: K100B-5 [message #25907 is a reply to message #25801] |
Mon, 13 February 2017 13:47   |
stevem
Messages: 4773
Registered: June 2004
Location: NY
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Senior Member |
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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.
[Updated on: Mon, 13 February 2017 13:51] Report message to a moderator |
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| Re: K100B-5 [message #25908 is a reply to message #25907] |
Mon, 13 February 2017 16:20 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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1500 grit Emory cloth did the trick.
It now has reverb, on all channels, and appears to be fully functional.
The power on/off pilot light bulb is incredibly dim. Could also be a dirty connection or just need to be replaced. I know it's a special bulb.
Cleaning up and reassembling. Bill, Steve, I cannot thank you enough.
Now, I have 4 more to go through. K100 guitar amp, 2 x K200b, and a 400. Will post issues as I find them.
What a great site.
Keep On Truckin'
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| Re: K100B-5 [message #25909 is a reply to message #25908] |
Mon, 13 February 2017 18:25 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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Glad to hear the good news.
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.
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| Re: K100B-5 [message #25912 is a reply to message #25910] |
Tue, 14 February 2017 10:38 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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Member |
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Steve, you nailed it. It is a GE bulb, but 1893, not 1829. Will try to source this. Is this the common number used by all Kustoms?
Keep On Truckin'
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| Re: K100B-5 [message #25913 is a reply to message #25801] |
Tue, 14 February 2017 10:55 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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Mouser carries them. All of the non-metal front amps use the same 1829 bulb.
You might want to wait and see if any of your other amps need any other parts before you place an order.
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| Re: K100B-5 [message #25914 is a reply to message #25913] |
Tue, 14 February 2017 15:07 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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Member |
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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.
On to the next K200B-1.
Keep On Truckin'
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| Re: K100B-5 [message #25917 is a reply to message #25914] |
Tue, 14 February 2017 19:12 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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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. .??
Keep On Truckin'
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| Re: K100B-5 [message #25919 is a reply to message #25801] |
Wed, 15 February 2017 02:18 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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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.
[Updated on: Wed, 15 February 2017 02:20] Report message to a moderator |
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| Re: K100B-5 [message #25921 is a reply to message #25919] |
Wed, 15 February 2017 13:25 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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Appears you are correct. The fuse pod and switch both appear to be added. Horrible solders indicates that. The other jack is a monitor.
Keep On Truckin'
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