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PostPosted: Mon Feb 20, 2017 11:53 pm 
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Joined: Wed Feb 15, 2017 11:17 pm
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So my son and I both love to tinker and build things, we are both very much into music, and we are looking at picking up a locally sourced Hammond ao-43. He plays the bass and I TRY to pluck around on a guitar....lol. I have always loved the Matchless Lightning tone and was pleased when I found this forum and the tones emitted from the TC15. My problem is that i know just enough to mess things up. After overlooking the schematic I have highlighted a few areas to make sure if I am correct or not in my thinking. We are trying to reuse the transformers, I know the power transformer is HOT since it is 315-0-315 and the trinity spec'd PT is 290-0-290 but I should be able to make it work, right? The output transformer should work as well but it will only be 8ohm, right? I will also need to just eliminate the crunch/munch switch?

When going through the schematic i was unable to locate capacitors 20-29 and 38.


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resistors-capacitors.xlsx [11.55 KiB]
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Power supply.pdf [105.45 KiB]
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input.pdf [104.17 KiB]
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coupling caps.pdf [108.79 KiB]
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PostPosted: Mon Apr 17, 2017 8:52 am 
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Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7519
Location: Canada
To PT will work but you need to either drop the B+ voltage down closer to spec, or change the bias resistor so that the EL84s don't burn up. I would drop the B+ with a voltage dropping zener, like we use on the TRIWATT for the 6V6. You can also put in a VRM which will allow you to adjust the voltage precisely.
Look in the Resource forum for Voltage Dumping Zener.

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