cetoole

All that polyester must be somehow related to disco, just cant think what else you are planning for that quantity of it. Disco dancing vikings at canjam.

I think it is just a notch filter, so I wouldnt go playing with it. A notch in the wrong place doesnt sound like something I would care for.

Bit of a change, eh Beefy? We had some snow last night, and the prediction was for more, plus ~1.5" of rain/ice, but it just rained a lot. Back roads were a bit of a mess, but nothing bad.

Agreed. I didnt listen to them as much as I might have liked, but I did enjoy Alex's HP2's at the meet.

E810F works nice for me, or D3A, or one of a number of other high slope pentodes, triode connected. Heck, you could also have a pentode/triode switch if you want. Check out this page: High Gm driver pentodes

l'espressivo with electra-print iron wound for 120ohm secondaries.

Just got home, had a great time. Thanks to all, was great to see everyone (except Brent).

I love my memory foam pillow. Dusty, if you dont know, there are specific covers you can buy made for people with allergies which basically completely seal off the pillow/mattress, and can be taken off and washed. I have them, got them a few years ago at the recommendation of the allergist I saw at the time (not seeing any now).

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.