The Jan Philips in my limited experience are horrible, glare,grain, thin and they roll off on both ends. There are many better.
I just replaced them in my Unico with the new production JJ Tesla 12au7 (ECC82) (got them from Triode Electronics on the net, about $20 for the pair)and it was a big improvement. From here, I am going to look at Mullard, Amperex and Telefunken, the New Old Stock (NOS) tubes that get the biggest raves. Gets pricey though ($40+ a tube).
There are many others, like RCA Clear Tops 12au7, which is supposed to be the best 12au7 tube ever made in the US. More reasonable in price than the Euro tubes.
Many people talk to Kevin Deal at Upscale Audio, he is very knowledgable on tubes and has many in stock. Hope this helps.
I just replaced them in my Unico with the new production JJ Tesla 12au7 (ECC82) (got them from Triode Electronics on the net, about $20 for the pair)and it was a big improvement. From here, I am going to look at Mullard, Amperex and Telefunken, the New Old Stock (NOS) tubes that get the biggest raves. Gets pricey though ($40+ a tube).
There are many others, like RCA Clear Tops 12au7, which is supposed to be the best 12au7 tube ever made in the US. More reasonable in price than the Euro tubes.
Many people talk to Kevin Deal at Upscale Audio, he is very knowledgable on tubes and has many in stock. Hope this helps.