Top resistors

Every time I have changed the 6C6 cathode resistor I have heard a sonic difference and it is not subtle. This is a single ended amp with a low parts count. When I pulled the bypass capacitor that made made a dramatic difference in sound as well as the gain of the amp. Response34, I will look into the possibility of replacing the 91k A-B's with 91k/12watt Mills resistors. This is the 6C6 plate resistor and audio signal is present here. For now I am happy with the overall sound of the amp.

After 100 hours the TX2757 are here to stay. They let the music pass thru with richness, clarity and depth. No hi end emphasis or etch. Each instrument has its own accurate color and detail but not at the expense of the overall musical message. Front to back depth is very pleasing and I am not missing the A-B's or the AN Tantalums.

After a month with the TX2757 in the 6C6 cathode position, including bypassing them with Black Gate Caps I decided to pull these resistors. They did not provide the richness and room filling sound that the A-B's and the older AN Tantalum did. A few weeks ago I got two of the most recent production 1k An Tants from the Hi Fi Collective.

These new Tants are more closely akin to the A-B's than to the TX2575's. They are not as sonically accurate or pure as the TX's. But they do fill the room with rich satisfying music like the A-Bs but with more detail and without the extra noise or warmth or whatever it is with the A-B carbon comps. Still running the amp without the 6C6 bypass cap.

Very interesting comments. I have tried in a DHT preamp the Audio Note, Shinkoh, Takman, Riken and Amtran resistors. They all sound different. I prefer the Shinkoh for a more realistic and natural. The metal film was more lively and open compared to the Shinkoh. Second to the Shinkoh was the Audio Note, very close but not as natural in tone or flesh sounding. I am able to switch the resistors on the fly as I built them into a rotary switch. Many people who have heard the preamp in "their" system agreed to my findings even though they did not know what resistor I was switching to. Not sure if I would get the same results in speakers or amplifiers as I have not tried this yet.

Happy Listening.

Bigkidz,

That rotary switch is great idea and thus provides instant results. Nice! I will have to try the Shinkoh's when I begin to "voice" my newly built phono pre.

It's good to keep in mind that I/all of us have different ears and listening priorities. I am voicing my amp to work with my sources and speakers in my room without a preamp.
It must be very difficult for the professional builder to voice an amp or preamp with so many variables to confront. I have been voicing my amp slowly for about a year.

Interesting comments Jetrexpro. It goes to show that longterm reactions are what matters, not quick conclusions after just a few hours. Thanks for sharing.
While my experience with Vishays is limited to the regular series, both nude and otherwise, I have to say your comments are very similar to my reactions. Vishays can sound too cool, lacking in warmth and emotion. IMO, they have their place but need to be used sparingly. For instance, I only have one in my system right now---as the grid stopper on the input tube for my SE amps. It works great there and helps to offset a tendency towards excess warmth.