audio-talk

OK it's low noise, but in relation to what sort of levels The noise is quoted in terms of equivalent resistance, and so the pentode produces the same amount of thermal noise as 100R resistor. Remember that even though this is designed for telecom use, its not talking about the amps in the local exc...

Yes that's very interesting, but at the risk of seeming argumentative, that applies to telephone communications, not phono pre-amps Yep, but many of the same requirements cover both uses, and low equivalent noise is low whatever you go with it. Many of the "audio" valves are optimized for...

How is the first valve heated?

But you are never not hearing sound, so there is no internal reference to go to. I guess this is why live acoustic music is a s close as you can get if this worries you. What I find though is the overall sound isn't that big a deal, as long as its not broken, as you say you get used to it. What I fi...

Yep, I think so, its why I try not to make decisions based on first impressions.

But then again I have never seen Ali and Ann Widdecombe at the same time...

Let's face it, getting old is a pain in the arse.

You can get some cream for that...

Can I assume that the 10M45S will be a good replacement ?

Should be fine.

Add some series resistors then.

Actually what I think they are useful for is showing that 15kHz is not something that matters a big deal when it comes to music. I think if they didn't know most people would hear a 1kHz tone and expect it to be more like 10kHz

Gain will be different, and the output impedance will be different, the distortion spectra will be different, the frequency response will be different. Not much difference then. :wink: :lol: I just said what some of the differences will be, not the magnitude of those differences. Oh, and another, w...

Gain will be different, and the output impedance will be different, the distortion spectra will be different, the frequency response will be different.

Yes, if not using feedback, just combine the resistors and take the cap to ground.

..and thats ^^^ also the reason I can play really really fast!!!!

May also be the reason you seem to have so many problems with numbers?

Can't say if one inspired the other, bit its playing a similar game. Same as JRB's Aikido does.

No, a ultrapath cap is just between B+ and the cathode. And of course at AC B+ is effectivly the same as gnd. But the point of the ultrapath cap connection is the signal current loop doesn't go via the last cap in the power supply.