Im new to the wold of 211 tubes. One of my tube sets just says 211 on them. No stamps or any other clues to what and where they come from. Can anyone help?
Problem sort of solved… I connected til ATM 211 to my Perlisten S7t(92-93 db sensitive) and you have to be within 1 m.(3ft) for the hum to be of any issue.
Apart from the hum both amps are totally noice free, no hiss from the 288/1505 or UHT. The level of hum is not affected by the attenuator (gain/volume adjust) on the ATM-211
First impressions are WOW! Om my VOTT the SQ is just on another level compared to the SS amps. The room is huge and the separation of the instruments/voices is simply fantastic. The only issues is the transformer hum that is clearly auditable as the 817 are extremely sensitive… but I guess...