Has anyone replaced tubes in Aesthetix Rhea ?

I wouldn't assume the power regenerator eliminates the possibility of interference from some other electrical equipment. If I were you, I'd still explore the possibility.

I agree it seems unlikely, but it is possible that some component within the Rhea is failing and causing intermittant problems (e.g., some component within the power regulation circuitry). If replacing the tubes does not resolve this, I'd recommend contacting Jim White at Aesthetix directly to see if he has any ideas.
.

Also... I don't know what an RPTV is, but if it's a TV, that could be causing tube interference too if it's turned on?

Patrick

Some time ago I had a problem with a socalled "dimmer" from a strong light in my living room.
Depending how "close" it was, the more hum and buzz I had.

Patrickamory, I had earlier spoke with Jim White about the power regenerator and he simply suggested I try listening to the unit plugged directly into the wall because of the size of the transformer. I do not have it plugged into one of the regenerated ports and, in any event, I tried to go directly into the wall, but it did not solve the problem. Also, the Rear Projection TV does not seem to have any effect on the unit. The other night when I had friends over, the TV stayed off. I intend I calling Jim White if the replacement tubes don't do the trick.

OK, the Telefunkens arrived today. Now mind you, the Rhea has been consistently quiet so it came as no surprise that I did not hear the ringing which I had been hearing when the Telefunkens went in. What I'm a little disappointed with is the fact that in terms of tube rush, I do not find the Telefunkens any quieter. At a certain volume level, which I consider moderate, at the listening position, I can hear the rush of air coming from the speakers. Its not a ringing and I accept this noise as being entirely normal. I never thought tubes would be silent or even whisper quiet, but I did think from all I read and heard that the Telefunkens would be quieter. Not so. I understand that Jim White hand selects the Sovtek 12AX7s he puts into the Rhea for low noise so either he does a very good job, or the design of the Rhea is just a high gain unit which is prone to a fair amount of tube rush. Anyway, my question is this: I replaced the 4 12ax7s in the first input gain stage. I'm still aclimating myself to the Telefunkens, and at most I hear a slight warm and bloom in the midband. Rhea tube complement (each channel) is V1 & V2 (12AX7LP—factory graded low noise), V3 & V4 (12AX7WB) and V5 (6922). Do you think I can get the unit to run quieter by swaping out the 12ax7WBs or the 6922. The folks at Musical Surroundings which distributes the Rhea said some people have had good luck with GE 5751s. I'm wondering if I go with 5751s in V1 & V2 and the Telefunkens in V4 & V5, do you think it will lower the noise floor. Should I swap the Sovtek 6922 with a Telefunken or Mullard 6DJ8? Any ideas where to go from here in terms of improving the performance of the Rhea be it to have it run quieter or richer? Thanks.