{"id":147,"date":"2023-05-03T18:30:55","date_gmt":"2023-05-03T18:30:55","guid":{"rendered":"https:\/\/www.4dex2.com\/?page_id=147"},"modified":"2023-05-06T08:58:04","modified_gmt":"2023-05-06T08:58:04","slug":"50w-jcm800-2204","status":"publish","type":"page","link":"https:\/\/www.4dex2.com\/?page_id=147","title":{"rendered":"JCM800"},"content":{"rendered":"\n

So I built my guitars<\/a>. I showed them to my friends and after ‘Dude, you should build an amp for that now,’ I Googled ‘Marshall schematics’ and ‘how not to get killed by high voltage amps’ and did my research. My grandfather was a professional electrician, so I approached the project with some kind of hope that a few of his genes made it into me. I settled on building a 50 Watt JCM800 – 2204 like everybody else did. By the way, a really great source of information is Rob Robinette’s Tube Amplifier Website<\/a>, Designing Tube Preamps for Guitar and Bass<\/a> by Merlin Blencowe, and Nik at CeriaTone<\/a>. <\/p>\n\n\n\n

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The amp was ready, now I needed a speaker cab. A 2×12 should do it. I used 15mm birch plywood and the speakers are two Celestion Vintage 30’s. The open back panel was not calculated for certain frequencies, I just simply ran out of plywood and now it serves as a great storage place for cables, a guitar stand, extension cords and other junk gathered after a gig.<\/p>\n\n\n\n

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I soon realized I’d like to use both High and Low inputs while playing. So after going back to Blencowe’s book<\/a> and reading a chapter on relay switching, I gutted out the amp and rebuilt the preamp section. I split the tone stack for both channels, keeping the low the Marshall way and trying a little bit different cap values for the high gain.<\/p>\n\n\n\n

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So I built my guitars. I showed them to my friends and after ‘Dude, you should build an amp for that now,’ I Googled ‘Marshall schematics’ and ‘how not to get killed by high voltage amps’ and did my research. My grandfather was a professional electrician, so I approached the project with some kind of … <\/p>\n

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