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Posts by hodgjy

The HA-501 is only an amp. The UD-501 is both an amp and a DAC. Yes, the UD is reported to be a little flat, but the HA is by far the best solid state amp I've ever heard.
There probably won't be a MB DAC for this because they need to be on all the time. Amps do not.
 They are decent. They have slight veil to them, but they are pretty balanced. Unlike the post above this, I found them to be the quietest of all the tubes I've used from this family.
We may be talking about the same thing. It's common for tubes to make loud pops and pings that are audible in the headphones during warm up.
I guess it depends on the amp design--and I don't remember what my amps did with pinging tubes because it's been a while.  They were never loud at all, so I had no worries of any damage to my headphones or ears.  They were certainly no louder than listening volume of the music. All vacuum tubes are microphonic, so they can pick up noise and transfer them to the headphones. Tapping the table can even transfer noise with some very sensitive tubes.
A few pops during warm up is normal as the materials expand from heat. If they continue for 30 minutes, then I'd consider a new tube. The pings won't hurt anything except your mind.
I've had many Tung-Sols and Chathams, and most of them had a rattle. It seems to be more common in these brands (same tooling facility). I've never had a problem with the rattle. I even have a Chatham where the plastic base came completely unglued from the glass. Still works fine.
I haven't. It's not a major deal---see the post above.
It's a Woo. Some tubes are quiet, where other are noisy. I believe, maybe incorrectly, that if some tubes make no noise, the amp may be ok. It's not a big deal because that amp rarely gets any use these days. I've significantly upgraded from it.
I wish I had your luck. My "luck" is probably due to my amp being very sensitive to tubes (I'd say 7 out of 10 tubes make noise in it) and my extremely sensitive hearing. I can't hear tube noise when the music is playing or if there is sufficient background noise in my home, but when it's quiet and I concentrate, I can hear the tubes making noise. Even my beloved 5998 tubes have a low level noise, but my RCA 6AS7Gs are by far the worst offenders. Heck, even one of my...
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