Dear ADG, Yes, I own a Hickok tube tester, and the number of times it has served me to detect truly defective tubes is near to zero, because such tubes gave away their condition just by listening to them. It is not that useful for tube matching, either, because it tests all tubes at the same plate voltage and current, which is typically very different from the in-circuit parameters. Tubes that "match" at one voltage/current setting very often do not match at other settings for voltage, current, grid bias. Some of the best Hickok testers (e.g., 539B and C) do offer a choice of some of these parameters; those models are to be preferred and are both scarce and very expensive these days. Further, if you own one, it needs to be calibrated and kept that way. As an alternative and perhaps to your point, there are available modern tube testers that can actually trace curves. (I forget the brand and model names, but the internet will tell what they are.) That's the valid way to match tubes. Those are the types used by reputable pros who sell tubes, like Jim McShane and Kevin Deal. If you want to spend a few thousand bucks on such a tester, that's in a different league from the vintage testers, but are you seriously suggesting that we all need to go out and buy such a device?
Tube advice
I have several decent, newer ARC tube amps and will soon be approaching tube replacement time. ARC apparently has a very thorough vetting process for the tubes they install and sell. That of course runs a hefty premium, more than double what the same tubes would cost from Tube Depot etc. The money's not a total deal breaker but still, for all three amps re-tubing from ARC is going to run close to 3k and if it's all the same would definitely rather not have to spend the extra $1500. Any insights would be appreciated. Thanks
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- 15 posts total
- 15 posts total