If I bought a Telefuken for $20 and it sounds s good as this $65 Psvane it would really depress me, so Im going to remain happy in my ignorance. I did however buy a $10.50 Mullard which sounded fabulous until I put in the Psvane. The Mullard however was a wonderful rich warm mellow sound that I loved. Just not as much detail and resolution as the Psvane. I'll have to start looking for a Telefunken.