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1  British Style / JCM 800 2203, 2204, 2550, 2555 / Troubleshooting a 2203 on: April 14, 2016, 06:19:04 PM
hi all,

new to the forum but I took part in a group build of a 2203 about 8 years ago. The amp was working great at the time but life happened and it ended up in the closet for about 6 years. Im a woodworker by trade so this past winter I built a mahogany box for the head and this weekend I built a speaker cab. plugged it in today for the first time in 6 years and no sound. To make a long story short, the power tubes dont glow but im reading 530V across pins 3 4 and 6 which seems a bit high. I am not however reading anything across pins 1 and 8 which should read 35mV according to my literature. Its been along time since I wired it so obviously nothings fresh and Im basically looking for a bit of direction with troubleshooting it. preamp tubes glow and read proper voltage and both fuses check for continuity. Any help on what to check would be greatly appreciated.

- Mack
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