tavishdad
Responses from tavishdad
| List of Audio Tube Measured Noise Performance The list of tube noise measurements on our “Downloads” page has had several updates since my last post here. It now includes measurements on the Toshiba 2SK209 JFET, which is an interesting comparison to the tubes and provides a sanity check on my... | |
| List of Audio Tube Measured Noise Performance Hi Lewm,Intrinsic noise is not important if a tube is used at high signal levels. It is only important in the first stage of an amplification chain, where it can set the signal to noise ratio of the system. You mentioned that you use the ECC99 in ... | |
| List of Audio Tube Measured Noise Performance Hi Everyone,I updated the measurement list on my website "Downloads" page to include additional samples of the JJ 5751, and also an additional tube type, the JJ ECC99. http://tavishdesign.com/pages/downloadsThe JJ 5751 continues to be one of the m... | |
| List of Audio Tube Measured Noise Performance Hi Lewm,I'll put it on my to-do list. The only current-production ECC99 is JJ - is that what you use? What bias current do you run the ECC99 at?Scott | |
| List of Audio Tube Measured Noise Performance Hi Bdp24,Good question. The intrinsic, input-referred voltage noise of a tube (EIN) should be the same regardless of how it is measured. On my “downloads” page, I’ve provided a lot of technical details about how I made the measurements, so that an... | |
| List of Audio Tube Measured Noise Performance Hi Lewm,Thanks, another good question. If I understand correctly, you are asking if the intrinsic noise (EIN) of a tube really makes any practical difference in your audio equipment. It will only matter if the tube is the first active device in a ... | |
| List of Audio Tube Measured Noise Performance Since my last post here, I’ve updated the list on my website to include more tube types (such as the European D3a), and many more samples of the original tubes. The list at this point includes 95 samples and 15 different brands and types, along wi... | |
| List of Audio Tube Measured Noise Performance Hi Everyone,I updated the measurement list on my website.1. I included a few more samples of Shuguang 12AX7B and Shuguang 12AT7.2. I included new measurements made on the JJ EF86 (they call it EF806S). I've read in many places that pentodes are no... | |
| List of Audio Tube Measured Noise Performance Hi Lewm,Thanks, you have raised some important issues. It is not true that high gain tubes are necessarily noisier than low gain tubes. Tubes, like transistors, are characterized by their input-referred voltage noise (EIN) and input-referred curre... | |
| List of Audio Tube Measured Noise Performance Those are all good comments and suggestions. The current production tubes I tested were not pre-selected in any way. They were purchased in small lots from 3 different retail online tube vendors in the US.Next time I update the list, I'll include ... | |
| replacement rectifier -- currently 5Z4P is 5AR4 OK If you haven't already answered your question...... the 5AR4 will work just fine.Scott |