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| | |-+  Problem with a build...fixed and some photos		 « previous next »
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Author Topic: Problem with a build...fixed and some photos  (Read 5234 times)
RichardG
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« on: January 31, 2010, 07:50:07 AM »
I just built a ceriatone 18 watt TMB.

Plugged it in worked great. Cranked it up and the sound started dropping in and out, then it stopped, then a electronics burny smell. I figured out that the he1K5 5 W  Resistor that runs across the 32uF/32uF was burnt out.

I had another one the same so I soldered it in and the amp works again.

BUT..... It is showing the same symptoms as before.....If I crank up the sound cuts out, so I have turned it off so I do not cook that resistor again. Seems OK at low volumes but I do not want to push my luck by testing it for an extended period.

I did take it to a tech prior to turning it on just so he could check it over, so I am 99% sure it is wired fine.

Any suggestions would be appreciated.

Thank you.
« Last Edit: February 04, 2010, 11:13:45 PM by RichardG » Logged
cmoore
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« Reply #1 on: January 31, 2010, 09:24:08 AM »
Can you take some voltage readings with all the pots on Zero, the Trem turned off, and the power tubes out of the chassis? It could be a lot of things, including bad power tubes. You can put the power tubes back in and see if your volt readings change.
Do you have a light bulb limiter?
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RichardG
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« Reply #2 on: January 31, 2010, 10:02:22 AM »
Quote from: hired hand on January 31, 2010, 09:24:08 AM
Can you take some voltage readings with all the pots on Zero, the Trem turned off, and the power tubes out of the chassis? It could be a lot of things, including bad power tubes. You can put the power tubes back in and see if your volt readings change.
Do you have a light bulb limiter?

I can do that.

No I don't have a bulb limiter.... I probably should make one.

Thanks
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RichardG
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« Reply #3 on: February 04, 2010, 11:12:44 PM »
Fixed, bit thought I would post in case anyone is interested.

After much rooting about, it turned out to be a bad power tube.

I should have checked tubes first, but in my mind the problem was presenting like a bad solder in the power section or something like that.

here are some gut shots I took for Nik. Its not tidied up yet as I was waiting until I fixed the problem

http://picasaweb.google.com.au/cashmeuppawnbroker/GutShots#

and here are some progress photos I was doing as I went

http://picasaweb.google.com.au/cashmeuppawnbroker/Marshall18WattBuild#
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