I have a First Sound Presence Deluxe preamplifier which I bought used. This preamp as well as the JOULE ELECTRA use the OA2 tubes. What sort of tubes are these? When where they made and why are they not more prevalent in other preamp except in a handful of them such as the JOULE and the LAMMs, as well as the First Sound gear? What particular sound do these produce that make them appealing or unappealing for designers to incorporate them in their designs? Is there a designation that is different than the 0A2 that I am not aware off?
UHHHH!!!! I had one 0A2-tube break, and both channels continued to work however it did not sound as good as usual. I wondered why I started to lose my hair!
My knowledge is limited regarding the OA2 tube and I’m sure there are others that read this forum that are much more knowledgeable about tubes then myself. I’m responding because I also own a Presence audio preamp. The 0A2 tube serves as some type of a regulator control agent. Your preamp will work with or without the 0A2 tubes however it will sound best with the tubes. The First Sound preamp seems to perform and sound the best with the Sovtek 0A2 tubes.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.