Which Audiologic dac was the first to go 24 bit?

I don't think he's going to install the 20 bits. If you guy's don't know, the Altis is a Bitstream machine.

Rx8man - Hello - your comment about "special tubes" caught my attention, as I have been wanting to try another set in my M34 dsm, purchased here used a couple years ago. We will be moving shortly; so, while the system is taken down, I thought it would be the opportune time to install new tubes, since I have no idea about the previous history of the stock unit. Also, my owner's manual apparently is missing the "tube placement diagram" page. I've never purchased a tube in my life, but figured I would contact Andy at Vintage Tube after reading about him here on the forum, and then at his website. Would you be willing to share your "special" ingredients.
Thanks very much for any suggestions you might care to provide.
Best regards,
Tom

Pat (Rx8man).....do you want to talk about tubes
in the M34, or do you want me to jump in at this
point?

Hey Jeffcott go for it, thanks for the offer !!

I thought that Jerry told me that the 24 chip was better when I was buying my used AL unit 34 that had the chip upgrade. I guess I was wrong. Hmmmm. I think I have some Amperex 6922 gold pins in the unit as well as some Amperex 7308s??? They sound much better then the stock tubes. Rcprince has much more experience then I do and I am not sure if the tubes I am quoting are the ones the unit has, if I get corrected then I'll have to check into it further.

Happy Listening.