|
|
刚买了一个6505+ 看论坛好多在国外的兄弟 提到FJA MOD
由于资金有限 不可能把箱头发到美国找FJA改
于是我就到处搜索怎么MOD 。。。。。 目前 只搜索到了怎么改扁压值的方法
由于还没买到箱体 所以没法亲自尝试 诸位先睹为快吧 希望对想改箱头的兄弟有所帮助
本人英语很烂，有不对之处，请大家指出更正。 谢谢
原文：
Peavey 5150 II and 6505+
The 5150 II and 6505+ are the same amps and fall into the love it or hate it category. I get calls and emails all the time from players who sold or traded their original 5150's off for the 5150 II or 6505+ and the question is always, "how do I get my 5150 II or 6505+ to have the balls my 5150 had?" Unfortunately the answer is you can't get there from here... The voicing on these amps is totally different than the original 5150 and Peavey choose to basically neuter the 5150 II. It simply does not have the low end grunt and raw sound that the original had. This is not bad, its just different and you will find plenty of players who love the 5150 II.
I'm questioned a lot as to the bias adjustment on the 5150 II and 6505+. This amp does have an adjustable bias but the available sweep is pretty narrow and the only way to get the power tubes out of crossover distortion is to lower the resistance to the circuit and once again this is a very easy mod and well worth it.
Inside the amp there is a small circuit board that has the bias trim pot mounted on it and the final bias resister which is a 12K 1/4 watt resister. All that's necessary is to replace that resister with a 6.8K 1/4 watt resister which will increase the window of available bias adjustment. A final bias setting of between 36 to 40mA of plate current per tube measured with a bias probe is a good setting. You only need to probe one tube, set the bias for it and you’re done.
The bias pot is located right next to the power tubes so if you use a short bias probe you don’t even have to remove the amp from the chassis. We have our own Eurotubes bias probes which can be used with any multimeter that will do this for 25.00
翻译：
第一段都是介绍，和改装无关，不翻译了。。。
关于一些调整5150II和6505+的问题。这个音箱已经有了一个调整扁压值的电位器。但是电位器的可调性太小【可调范围太窄】。只有一个办法就是将电路的电阻降得更低，从而得到更强大的电子管失真度。然而这是一个很简单而且很值得去尝试的改动。
在箱头内，有一个小的调整扁压值的电位器。电阻值是12K 1/4W。必须换成一个6.8K 1/4W的电阻的电位器来替代它，从而得到更强【更宽广】的扁压值可调范围。最慎重的设置为扁压在36----40MA范围内。你进需要测试一根管子，设置好扁压值，你就完工了。
广告。。。。。。。。。。。。。。。。。。
-------------------------------------------------------------------------------------------------------------------------------- |
-
|
发表于 2010-5-5 11:03:19
