11
PrimaLuna©ProLogue Eight

Tube Information

The 12AX7, 12AU7 and 5AR4 tubes will have a life of about 10,000 hours.
Here are some tips on using tubes:
Do not use treatments on tube pins or in sockets.
If you decide to experiment with other types of tubes, it is critical that you rst turn the
power off to the CD player, then turn the volume down completely on your pre-amp AND
also switch your pre-amp to a different source. We recommend you not swap tubes in and
out repeatedly because every time you insert a tube, you increase the chance of loosening
the tube sockets. It’s okay to have fun, and we support that, but don’t go crazy and swap
tubes in and out twenty times a day.
The ProLogue Eight has a warm-up time of just a few minutes. Although it is not wise to
leave tube components on 24 hours a day, you may leave this player on if you choose, but it
will result in more frequent tube replacement. Through experimentation, come to a conclu-
sion that ts comfortably with your lifestyle.
Break-in yields improvements. So, when your CD player is new, or when you re-tube it, it
may take a little time to settle in. There is however no xed “time rule” for break-in.
*IMPORTANT! Please note that tubes can vary electrically, and by plugging in the wrong
type of tube (i.e. 6922 for a 12AX7) you can damage the unit and void your warranty.
Common replacements:
12AX7: ECC83, ECC803S, E83CC, 7025, CV4004. You can also use a 5751, but please note
that the 5751 is a lower gain tube than a 12AX7 and the sound will be altered.
12AU7: ECC82, ECC802S, E82CC, 5814, 6189, CV4003
5AR4: GZ34, CV1377 are equivalent. 5V4G, 5T4, and 5Y3 will also function ne with
small sonic changes that you may want to experiment with. Do not use other types as
damage may occur.
Some tubes and tube sockets
(in this case, the 5AR4/rectier)
have a center “key” which must align.
If you force it when misaligned,
you will damage important and
expensive parts of your CD player.