I compare a '66 Vox AC50 to a '63 Vox AC30. I'm playing them through the same '71 Marshall 1960A cab with G12M25 75Hz Pulsonic Greenbacks using a '08 Gibson Les Paul 1959 Standard Reissue, R9. The Vox AC50 is sometimes referred to as Vox's Marshall since it features EL34 Power tubes.