1952 Telefunken VF14M Tube For U47 And U48 + Phaedrus VF14M Backup Tube | Reverb Brazil
Original Neumann U47 with VF14m tube | #206269469
Advanced Audio Mics - Working on some new ideas with the VF14M tube on the R + D bench test jig. The Telefunken VF14M tube was used in the very first U47