Pentodes in general aren't good phono stage tubes because of partition noise, the excess noise inherent in pentodes because of the statistical nature of electron flow when given a choice between screen and plate. In this service, you'd do better with a triode. The 5691 could be a good choice if you can live with the input capacitance (a few hundred pF).
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.