Members gregbass Posted July 2, 2005 Members Share Posted July 2, 2005 Hey folks, need some tech help from someone who knows about amps. I have a Yorkville 100w kickback that I have been using for playing bass. One day while playing, it ramped up in volume, then stopped working. Or at least the subwoofer did. The tweeter horn works fine however. So I took it to an electroincs repair house and they said the subwoofer and low frequency crossover need to be replaced to the tune of $230. The description reads: "Repair main crossover (bass) and low freq amp, replace spkr." I have disassembled the unit, and have no idea what to look for to repair the crossover. The 12" subwoofer is a plug and play no-brainer, but I would love to hear recommendations for a robust replacement since I have it apart. At any rate, here is a photo of the board, and I have a copy of the schematic that I can post as well. Can anyone offer help with this? If you can point out a specific spot on the board where I need to work, I can provide a much higher resolution photo so we can discuss details. Many thanks! -Greg Link to comment Share on other sites More sharing options...
Members Fran da Man Posted July 2, 2005 Members Share Posted July 2, 2005 Welcome to the forum Is that a bass amp? Link to comment Share on other sites More sharing options...
Members Mudbass Posted July 2, 2005 Members Share Posted July 2, 2005 Originally posted by gregbass I have disassembled the unit, and have no idea what to look for to repair the crossover. Best argument for putting it in the shop that I've heard yet. Link to comment Share on other sites More sharing options...
Members jazzbassist Posted July 2, 2005 Members Share Posted July 2, 2005 So you blew both the crossover and the driver? call up yorkville, tell them you need a new crossover and a new speaker. They will probably sell you one. It won't be cheap. There is really no way you are going to repair a crossover card. They are designed to be disposable. Link to comment Share on other sites More sharing options...
Members lue Posted July 3, 2005 Members Share Posted July 3, 2005 If the horn is working then there is nothing wrong with your amp, there is no cross over board, I,m sure it's your woofer only that needs to be replaced. You can call yorkville (service) at 905-837-8481 and ask for service. The woofer should not cost any more than 50 dollars canadian. By the way I looked at the schematic of this amp, if there was somthing wrong with amp you would not get any sound from the horn. Good luck. By the way this is a keyboard amp not a bass amp, the woofer is not designed for continious low frequency response. Where abouts are you? Link to comment Share on other sites More sharing options...
Members gregbass Posted July 3, 2005 Author Members Share Posted July 3, 2005 Lue, I am PM'ing you to discuss this a bit more, thank you. Link to comment Share on other sites More sharing options...
Members Bluescout Posted July 6, 2005 Members Share Posted July 6, 2005 You can test the woofer with a 9 volt battery Link to comment Share on other sites More sharing options...
Members gregbass Posted July 6, 2005 Author Members Share Posted July 6, 2005 Thank you guys, mudbass excluded, for your help with this. Lue gave me some excellent advice, and if I had simply left it with the shop for $200+, I would have been mudbassed, err, rooked. Turns out this particular amp either works or it doesn't. Lue's advice was spot-on. I contacted Yorkville, and an excellent tech advised me that the speaker was made by Eminence, and told me what to tell them for seeking a replacement sub. What a fantastic resolution! So I have a replacement "upgrade" sub enroute that will be able to handle constant bass, and I couldn't be happier. Less than $50 got me back underway. Best argument to seek a second opinion I've experienced yet. Link to comment Share on other sites More sharing options...
Members the_big_geez Posted July 6, 2005 Members Share Posted July 6, 2005 FWIW, that amp looks suspiciously like a Vox during thier dark days of the 80's. Hopefully it was made with a bit more Quality Control and better components... Greg, I'm glad you found a solution, but don't be too hurried in discarding Muddy's comment. It may have been terse, but often questions such as this are asked and there's honestly little other than what he said that can be. I know that I looked at the picture you provided and could offer no advice... Sometimes the thing just needs to be on a bench before you can tell. Link to comment Share on other sites More sharing options...
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