cetoole

Fits, Scott is doing you proud.

Stepping out of the door right now!

Thought about it for half a second, but nah. Dont use the earbuds I already have hardly ever, no reason to think I would use these more. $100 though, thats a different story.

Indeed you are a traitor to that lovely nest of Stax in your profile. I demand the LNS in penance.

Ouch, sorry to hear this Mike.

Indeed, appears to be what I though. Monolithic bridge rectifier into a cap, large Dale wirewound resistors in series to another cap (pi filter), wired directly to the filament of the 300b's. "Humpot" resistors leading to the cathode bias resistor.

So what, "DC" heaters, meaning bridge rectifier and fairly small CRC filter? Hard to tell from that pic.

Tin foil wouldnt help for EMI. A reasonable chunk of steel, very thick (like 5/8") aluminum, or maybe mu-metal or some similar high permeability metal might. Simple space is the best really.

Spacer between beta and Cary? I dunno what your setup looks like, but 1" could definitely make a difference. I know it does for me, 6-10dB worth.

Oh, you have the one with the 300Bs? Yeah, those are DHTs, which are even harder to get quiet. Not only do you have to worry about hum coming from the B+ and EMI, but the filament is also directly in the signal path, so any noise on it is multiplied by the gain of the 300B and injected into the output. I wonder how that amp is heated.

Yeah, very possible it could be louder in one channel than the other. That is how my amp is too, left channel, which is closer to the input choke in the power supply, is quite a few dB louder hum than the right. Tube dampers can help reduce microphonics in some cases.

You can definitely have a tube amp with no audible hum. Requires both sufficient filtering of the B+, as well as any fixed bias references if present and filaments if DHT. Also, you have to worry about EMI on the OPTs. My tube amp has a bit of audible hum with headphones more than about 98dB/mW sensitivity, which goes away if you move the OPTs an inch or so further away from the PS transformer and choke, at least listening with 109dB/mW sensitive Shure E4. There are certainly noisy tubes due to construction faults or damage, h-k leakage, but with good tubes and a well designed amp, it is definitely possible to have a tube amp that is dead silent, even with IEMs like dinny was talking about. Its just a real pita. Edit: what Nate said.

Might want to try moving it away from the Cary, just to see. The Cary almost certainly has transformers in it.

Coffee infused?

H1N1 vaccine, now work.

Moving the amp would be a good idea too, especially if the amp is sitting on top of the PS box. Seems though the beta is fairly apt to picking up EMI though, so it could definitely be some other equipment nearby, like a monitor or something.

Why dirty AC power? I would think it much more likely that you are running into issues with either EMI from the transformer or simply amplifier noise floor due to the level of voltage regulation being used.

Probably dual attenuator ICs, or a single attenuator IC configured for shunt. Probably using an attenuator with max ~66dB attenuation and no mute.

Shipping and customs on a pile of steel and aluminum.

Happy birthday Gene!

Yeah, thats the thing, if anything, the bass seems more than I remember hearing before on an SR-X. My ears are closer to the driver, probably half the distance of the new pads. The issue with the headband is mostly that I get the pressure right on the top of my head from the wires. A wee bit of padding wouldnt have hurt anything, or even a stiff headband that distributed the weight better than a pair of wires. Mine seems to have been hardly used, especially looking at the cable. Totally unkinked, very nice, clean, and supple. Headband has quite a bit of clamp, starts hurting the ears after a bit, though I have never run into a supraaural headphone which didnt. Best so far has been the Yamaha HP-1.

I think we know who really wants the Laphroaig...

Am I crazy for liking SR-X mk3 which have old pads where the vinyl is all gone? I never remembered liking SR-X with new pads on this much, and this being the case, am very tempted to just leave well enough alone, even though I have replacements here. On another note, this headband is really rubbish, isnt it?

I too use those Muratas.

Just FYI, you listened to the ED9 at Canjam. Afterwards, you turned to me, and said they sounded like they were broken.