I previously owned a Modulus 3. The prior owner inserted a brand new quad of National 6922 tubes. I got less than 300 hours out of the new tubes. They became microphonic. I sold the preamp and the buyer tested the tubes and confirmed they were spent. I think AI recommends Russian tubes which are known to endure inspite being run at the limit. There's no reason for a preamp (properly designed) to cook tubes this way. Not meaning to put down your choice of preamp - they do sound nice. I just could not see retubing yearly. Mullards or Amperex may sound nice but probably will not last long in these preamps. A costly affair over time.
Tubes for Modulus 3A
I took delivery of a used Modulus 3a today. I have a Modulus 3 which will go to my second system upstairs. I am not happy with the sound of this preamp, it sounds a bit thin, not much bass. I replaced the tubes with new Sovtek 6922's, but I am still not there yet.
I don't want NOS tubes and want to keep the price low and I also don't want tubes that will die in a few months. Recommendations please? I want more bass!!!
I don't want NOS tubes and want to keep the price low and I also don't want tubes that will die in a few months. Recommendations please? I want more bass!!!