La Radiotechniques Ptt2s or Bas Pre amplifer.
* Pre Amplifier tube is La Radiotechniques Ptt2s run in RC coupling
* Rectifier tube is Telefunken AZ1 Mesh anode
* Filarment of Ptt2s is DC regulate by LM317 and filter by commond mode choke
Sound is very good , excellent detail not smooth as #26 but more exciting and handle all kind of music.
>>> currently using SIF Ptt2s tip glass sound smoother than RT Ptt2s , for Valvo Ba and Siemens Bas they are very difficult to handle hum still need more experimental.
Remark: Picture show experimental tube is Valvo Aa , using same chassis and design some different in specicifation but sound is very close .
1 comment:
Hello. Very nice amplifiers. Could you send differences between Ba Amplifier and Aa Amplifier? I have a pair Aa and I'd like to build preamplifier. Very appreciate for answer!
Best regards.
David
e-mail: datoan@gmail.com
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