TAD RT124 EL34-STR Quartett Prem.

Recibí las válvulas y comprobé que estaban bien emparejadas. En cuanto a sonido no noto que suenen peor que unas NOS Siemens RFT, por lo que no tengo queja, aunque sólo las he probado a volumen casero. Lo único que aún no he podido comprobar es su durabilidad a medio y largo plazo.

Aunque hay otras mas económicas elijo TAD porque suenan bien y siempre me ha ido bien con esta marca. Me tranquiliza que las válvulas hayan sido probadas y seleccionadas, además es la marca elegida por muchos fabricantes de amplificadores como Laney.

Al estar clasificadas por parámetros como transconductancia facilita la tarea de reemplazarlas y permite elegir las adecuadas si tenemos un amplificador con un rango de bias muy alto o muy bajo, o tener unas de repuesto con los mismos parámetros para reemplazar sin necesidad de ajustar bias.

Very happy with these. I have them in a Laney GH100L (similar to JCM800). In comparison to EHX EL34 I had before these offer more harmonics and a dirtier more pleasant drive sound. The amp feels more loose and not so sterile as before. This could just be due to better biasing(?). They offer much better drive sound especially on high gain settings.
TAD recommends these for the GH100L.

Oh, the quartet wasn't paired very well. One of them reads different.

I bought these amplifier tubes to replace the original EL34 JJ tubes in my Orange TH100, which had started acting up. So far, I’m very satisfied with the sound – it’s incredibly rich! I’m slightly puzzled by the fact that they’re labeled as "matched," but as an average user, I couldn’t quite figure out where that’s indicated or what it means overall. The amplifier itself and the tubes, it originally came with didn’t have any markings. These new tubes have some codes on them, like A/B/C and D, which might serve as some kind of sequence indication, but in the end, I just plugged them in randomly and hoped for the best.