Members Bernie P. Posted March 21, 2011 Members Share Posted March 21, 2011 I'm considering having a go at fixing up my old Earth B-2000 myself.I found this book which hopefully will allow me to do so.-http://tubedepot.com/b-00004.htmlI think all it needs are some new caps and maybe some tubes replaced.Anybody familiar with this book or have a suggestion for another info source that would help? Link to comment Share on other sites More sharing options...
Members Mr.Grumpy Posted March 21, 2011 Members Share Posted March 21, 2011 If you are serious about doing this, be sure and get a digital multi-meter and learn how to use it, it's essential for protecting yourself from electric shock and for troubleshooting problems. Another tip - take a close, clear picture of your circuit board/tag board BEFORE beginning work! Electrolytic caps have polarity ("+" and "-" terminals) and if they are connected backwards it will ruin the caps instantly once the amp is powered on. You don't need to replace all the caps, just the electrolytic filter caps. Do you have a schematic for this amp? I understand the Earth amps were pretty much cheap knockoffs of Fenders. Link to comment Share on other sites More sharing options...
Members Bernie P. Posted March 22, 2011 Author Members Share Posted March 22, 2011 I don't have a schematic or anything else at this point.I'd heard these were essentially copies of the Kustom amps and that there were some legal actions as a result but can't say for sure. Link to comment Share on other sites More sharing options...
Members Mr.Grumpy Posted March 22, 2011 Members Share Posted March 22, 2011 A schematic isn't needed if you're just replacing the filter caps, but you need to be able to read the values off the cap(s) to buy an appropriate replacement. Oh, one more thing, amp techs will insist you need a variac to "form" the new caps, but there's some disagreement about this. In any case, I bought a variac for $70. Link to comment Share on other sites More sharing options...
Members misterhinkydink Posted March 22, 2011 Members Share Posted March 22, 2011 I've never used a variac on new capacitors. If you should ever find it necessary then get new capacitors. Link to comment Share on other sites More sharing options...
Members Johnny Crab Posted March 23, 2011 Members Share Posted March 23, 2011 I've got an old green-cover tube repair book at home with Fender, Ampeg, etc. amp schematics from the early 70's IIRC. Used it to keep my 70's SVT and Bassman running and modify Fenders and Marshalls with master volumes before they had them. I'll try to dig it up and post the Title, Author, and ISBN number when I get home.....running on 4 hours of sleep(gig last night) so no promises that will happen tonight. Link to comment Share on other sites More sharing options...
Members Bernie P. Posted March 24, 2011 Author Members Share Posted March 24, 2011 Thanks JC hope there's info on mine in it but it will help either way. Link to comment Share on other sites More sharing options...
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