Got a pair of NOS RCA Electron 805 tubes but they aren't matched. Didn't find a matched pair anywhere. Will there be a sound degradation using an unmatched pair?
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I have no idea how to do these measurements. Stupid question and I think I know the answer already but is a 2dB difference audible?
Surely it is audible. The measurements are very simple to carry. Can you listen to online tracks in your system?
Thought so. Yes I can, my MacBook Air is connected to my system.
So, all you have is going to the Wave Corrector site http://www.wavecor.co.uk/testdisk.html and play the adequate tracks in your system while measuring the output of the amplifier. Be careful some of these signals can damage your speakers!
I would use track 33 - 100 Hz at -30dB. Although I usually carry tests at 1000 Hz, but as some cheap meters intended to measure mains voltage are inaccurate over 200 Hz I recommend 100 Hz in doubt. I would carry this measurement with an amplitude around 1.5V AC (RMS) - enough to have a good resolution and not enough to disturb anyone. But you can also carry it with the speakers disconnected. What matters is how close the values of left and right channel are.
BTW, we can download the whole compilation for autonomous use - see the bottom zone.
Thanks for trying to help but isn't all this work pointless? I mean I'm not going to use the tubes anyway if you say the difference is audible in unmatched pairs. Also got a new factory matched pair of 805-T/2 Psvane's, wouldn't it be better to use those instead and sell the RCA's?
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OK, it's worth giving it a try if you put it like that but I need to get a multimeter first, which one do you recommend?
A Fluke 113 is on it's audiophile way! Will be delivered tomorrow.
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