I have an at4033 and a beyer m500n, both need warming up from tubes from what I hear. They are going to be on my guitar amp. And the 4033 maybe vocals also. A good preamp around a grand with tubes that get the proper voltage and 2 channels. The spl goldmike 9844 looks nice for vocals but on a guitar amp, 65 twin reverb I not sure, can anybody tell me if this will work fine. And or maybe other suggestions. Also thinking about Sebatron 2000.