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Ah yes, I've rolled opamps on my portable amps, but I felt that there affect are not as much as tubes. I'm rolling output tubes by the way not just driver, phase inverters tubes like 12AX7s or 6DJ8s.
Have you bought tubes from ebay before like GE6550A, Tung Sol 6550s, and other tubes? Have you been scammed?
I dont have experience with those tubes. I haven't been scammed on ebay tube purchases.
My last ebay tubes were for 12AU7 and 12AT7. Sovteks were new. The Sylvanias were old/used salvages from the mid 1960s time frame but the seller indicated they "tested OK, on his so-and-so tester". He had a perfect 100% feedback rating and regularly sold old pulled tubes. No complaints at all. In either case I had a good idea ahead of time what I was getting. The reality though with www tube sellers in general (ebay or otherwise) is we really DON'T know the history behind the product. Are they blowing smoke? or are they honest? Its a gamble no doubt, to which there are honest and reputable www sellers too.
I buy my EL34s local B/M. Groove tubes and Mesa boogie re-brands in my guitar amps. Havent needed to replace the EL84s yet, stock peavey rebrands remain in that amp.
The scams I am referring to are all the "NOS" ebay tube sellers around the world. I have my doubts about product authenticity and item representation of these sellers.... based on nothing more than a hunch, and thats all I have. Knowing ahead of time how rare and scarce some tubes have become.... and you get a guy from so and so country, sitting on a case of them, NOS in individual boxes....? It all smells very fishy to me.
Its a good discussion to have though, members looking to get into tube amps for the first time need to be aware of these kinds of things in the tube -VS- solid state debate. Conversely OP amps, current buffers and rectifiers (SS) are cranked out by the ~millions and just don't have this kind of underground sub-culture (for lack of a better term) going on.
I hope this doesn't offend anyone...
**EDIT** Oh and the ebay seller feedback rating can be a scam in itself... but thats probably too far off topic for this thread.