Tubes are noisier than transistors
Nope, it depends on the circuit. You can build ultra-low noise tube circuits if you’re willing to take the time to do it right.
And let’s get rid of the tubes won’t reproduce high frequencies myth too.
For many years, tubes ruled the high frequency roost in the megaHertz range.
The main advantage to transistors over tubes is less heat, less susceptible to shock and vibration, and now, lower cost.
There’s no difference in cables and cords
Somewhat true for loudspeaker cables, once you get past the teeny size wires.
Not as true for guitar and audio cables. Bad shielding, high capacitance, and poor construction can seriously degrade your sound in any cable carrying low level signals.
There are now even some wire companies selling “directional cable,” which is pure bull. Basically, it’s all just hype.
Different batteries sound different
Hmmm. Some people swear they can hear a difference in batteries. I remain skeptical of their claim.
Some batteries do put out more current then other batteries and that might change the sound but I think different batteries of the same actual voltage and peak current output should sound the same. The jury is still unconvinced on this one.
A condenser microphone is the best kind of mic
Best for what? If that was really true, they would use nothing but condenser mics in major studios. They don’t.
Every studio has dynamic mics, like the Shure SM 57, the AKG D112, the Sennheiser 421, and usually several ribbon mics and a wide assortment of general purpose mics.
Why? Because there is no such thing as the one perfect mic for everything.
For big ballads, it’s hard to beat the sound of a great big diaphragm condenser mic like the old Neumann U47, which now sells for around $10,000 in primo shape.
But even that mic occasionally gets beat out by a Shure 58 or an old ribbon mic for some voices or some songs.
A good engineer doesn’t go by price – they will pick whatever works best for that particular sound.