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It isn't obvious from the photo, but the tube is almost 7" tall and 2" in diameter. Its actually one of the lowest powered transmitter tubes; some of them are more like a couple feet tall and run on thousands of volts. No lie, people make audio amps out of these things.

Take a look at the data sheet link for the RCA 811 transmitter tube...... things like a maximum plate voltage of 1,250 volts...... http://www.radiovilag.hu/images/811A.pdf

When somebody markets a headphone amp which uses an 811 transmitter triode tube, you need to be afraid........very afraid..... :scared-eek: http://www.flickr.com/photos/gamma-infinity/448868550/lightbox/

How come amateur videos always look so amateurish???. Aren't there at least some amateurs who know how to do basic things like frame a shot or keep the fucking camera steady?? Its life's imponderables like this that drive me nuts. :angry-banghead:

Sounds like something's broke.

I use either barrier blocks or computer "D" connectors for everything I design for myself. The 1/4" phone plug is, in my experience, one of the most unreliable connectors there is (unreliable in the sense that they develop poor connections over time and drop signal or create a noisy signal);. I...

The internal grounding scheme in your receiver might be different from other sources you plug into the amp, which causes the hum when they are joined.

I seem to vaguely remember a set of files I uploaded several years ago which challenged people "on the other forum" to hear a difference between portions of various songs which were native 16 bit, interspersed with sections carefully reduced to 8 bits. Most people were not able to reliably tell...

If the amp only hums when connected to a specific input source (even when hot), then the fault is not likely with the amp. I can't think of anything electronic in your power amp which would produce hum only when connected to one particular input source like your preamp and not another. Of course...

If I'm reading correctly, it sounds like a ground loop between your preamp and the power amp. If the hum goes away when the amp is disconnected from anything other than the speakers, then the amp is not producing the hum.

24 bit files would take 1/3 rd longer by themselves to download, but 24 bit files are also usually at either at 88kHz or 96kHz sampling rates instead of the current 44.1kHz, and that along with the 24 bit word length would make for a VERY long download.

And I would wholeheartedly second Zing's post. :text-+1:

Lossy compression is what effects sound quality. 24 bit doesn't mean a thing. Like Flint said, I would rather have lossless 16 bit than lossy compressed 24 bit.

It will double the number of TUBE amps. :bow-blue:

Did I see some cheezy Home Depot zip wire feeding those luxury class binding posts? :scared-eek:

ICs which sense temperature are very common from manufacturers like Micrel. Usually they are used to control the speed of a fan, but can also take the place of older style bi-metal circuit breakers to disconnect the power supply if the temperature gets above a certain level.

While those relays will work, I would recommend a solid state relay. The reasons are that the coil of the relay draws a lot of current relatively at 75 milliamps, which could overload some trigger outputs or limit the number of components the trigger output can drive; the LED in a solid state...

The assumption was that the relay would be built external to the amp, probably in an inexpensive metal electrical outlet box with a power cord going in, a trigger signal going in (from the preamp) and an outlet to plug the controlled amp into. Here's a solid state relay which can handle up to...

The relay is meant to be powered by the trigger output of your preamp / receiver. A 1000 ohm 1/4 watt resistor would be inserted in series with pin #3 of the relay (the anode of the LED, which provides 10.8 milliamps to the LED inside the solid state relay). The other lead of the resistor would...

A simple solid state relay would take care of the trigger switching. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-2412-5-ND