Lewm, after reading your post, I browsed for Art Dudley's...
As mentioned in previous posts, I also experienced some hum problem with the 324 that I couldn't possibly get rid of during audition. The hum and overall noise level was NOT really annoying when listening. But it seems to coincide with AD's measurements of hum at 120Hz.
Unfortunately I didn't try a wide variety of MM/MI to prove if AD's concerns on higher THD at low frequency was valid. "Grainy" wasn't enough to describe the 324 I auditioned in my system. "Definitely a solid state" were.
88PB didn't have this hum problem at all. In fact, it is still being extremely stable and, up to this moment, among the quietest tube phono(actually a hybrid design) I have heard in respect of hum level, tube rush and background noise for any phono with more than 70dB of gain, though without much flexibility in capacitance choices and impedance loadings like 324.
In a nutshell, I prefer 88PB to 324 in my system.
Best regards
Dan
As mentioned in previous posts, I also experienced some hum problem with the 324 that I couldn't possibly get rid of during audition. The hum and overall noise level was NOT really annoying when listening. But it seems to coincide with AD's measurements of hum at 120Hz.
Unfortunately I didn't try a wide variety of MM/MI to prove if AD's concerns on higher THD at low frequency was valid. "Grainy" wasn't enough to describe the 324 I auditioned in my system. "Definitely a solid state" were.
88PB didn't have this hum problem at all. In fact, it is still being extremely stable and, up to this moment, among the quietest tube phono(actually a hybrid design) I have heard in respect of hum level, tube rush and background noise for any phono with more than 70dB of gain, though without much flexibility in capacitance choices and impedance loadings like 324.
In a nutshell, I prefer 88PB to 324 in my system.
Best regards
Dan

