Runwell almost all tube manufacturers use cheaper tubes. Doesn't mean they sound bad but it's known that NOS tubes usually sound better but too expensive for manufacturers to use them. It's all about profit.
I can change the tube,there are several brands on the market, prices is different,and I will choose the good one I think.but I will never ever choose the NOS tube the price is completed different from the new tube on the market. For example,300% or 400%.
If the amplifier get the good sound depend on such expensive tube, it means the design has problem.
Definitely agree it should sound good without NOS tubes but if it sounds better with them and they are priced reasonably then why not. Improved the sound of several preamps and amps replacing the stock tubes. Primaluna is one example but I won't pay ridiculous prices for NOS. Have noticed in the past couple years certain NOS tubes have become extremely rare.
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