I63

ECC83, B339, F91

Mullard

Branded Marconi

12AX7, I63

Mullard

Branded Hammond

ECC83, B339, I61

Mullard

Branded Marconi

PHILIPS, ECC83, I63

Mullard

12AX7A, ECC83, I63

Mullard

Branded RCA

ECC83, B339, F92

Mullard

Branded Marconi

ECC83, 12AX7, I63

Mullard

Branded Telefunken

ECC83, 12AX7, I63

Mullard

Branded The Fisher

12AU7A, I63

Philips

Branded Rogers

ECC83, B339, I63

Philips

Branded Marconi

ECC83, 12AX7, I63

Branded Mullard

B339

Branded Haltron

B339, ECC83, I61

Branded G.E.C.

ECC83, B339, I61

Branded Marconi

ECC83, 12AX7, I63

Branded Mullard

ECC83, B339

Branded Marconi

B339, 12AX7

Branded Osram

12AX7, ECC83, B339, I63

Branded Marconi

B339, 12AX7

Branded Marconi

12AX7, I63

Branded Ge

ECC83, I63

Branded Siemens

ECC83, B339

Branded Marconi

12AX7, I63

Branded Valvo