But there's no need to take it in every time you need to change tubes.Īny pics? I love brown Princetons! There hasn't been nearly enough chatter about them on here lately. If you do take it to a tech, ask if you can watch and maybe get a tech that's willing to take you through what their doing so you can understand what goes into it and what you're paying for. There's no point, the sky doesn't just open up and give you holy grail tonez. I've always felt that having perfectly matched tubes was bullshit. Tubes are always going to be a little mismatched (or a lot sometimes!) and that's okay. Chances are they'll sound pretty great without the need to worry about the tech. If something seems odd turn off the amp and swap them back. Just swap them out and see if you like them. I love Sylvanias from this era and earlier. The old Sylvanias may have been original and probably still sound great. Especially in this day and age where folks want to try tubes out and tweak. I can't say it will kill the value if makes it more serviceable. The bias pot mod is pretty much non invasive since it can go in the ground switch (irrelevant after a three prong cord is installed.) It really just adds range to the current bias resistor. I bought the amp based on the sound and didn't really pay attention to the fixed bias issue. how does he change plate voltage without any bias/trim pot? Does he actually change out a resistor each time to match the new set of tubes? I.e. I'm still unclear on what the tech does when I bring it to him since there is no trim pot. Would you say my options are to bring it to a tech each time I change the tubes, or to mod it? It seems trying to find the plate voltage at home is too dangerous since I've never worked in that much detail on amps. I don't plan to sell it, so I wouldn't care, but if I came into an emergency where I had to sell it I might get killed on price for the mod. I could have a tech do that, but it might kill the value of the amp. I read up on the mod changing the resistor and installing a trim pot. But, when I do change them out, can I just plug the RCAs in and hope for the best, or do I need to bring them to a tech each time? That can get really expensive. I probably won't change them until the Sylvanias burn out so as not to waste tubes. My current tubes are okay, but they are old Sylanvias, and I came into some RCAs that I wanted to try out just to see the difference. That's what I was thinking, so tubes probably burned out quicker, and maybe they weren't getting ideal tone. But I'm wagering to bet most folks simply didn't have that kind of info and were probably fine with plug and play. Kosmonautmayhem wrote:Not sure if folks took their amps in to be biased back in the day.
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