Tube Information

PrimaLuna© ProLogue Eight

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 first 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 fits 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 fixed “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 fine 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/rectifier) have a center “key” which must align. If you force it when misaligned,

you will damage important and expensive parts of your CD player.

pmn specifications

PrimaLuna USA is a distinguished brand in the world of high-fidelity audio equipment, known primarily for its innovative tube amplifiers and integrated amplifiers. Founded with a commitment to delivering exceptional sound quality and performance, PrimaLuna has carved out a niche among audiophiles, blending sophisticated design with cutting-edge technology.

One of the standout features of PrimaLuna products is their use of premium vacuum tubes. These tubes are revered for their warm, rich sound and ability to enhance the listening experience. PrimaLuna employs custom-made transformers which are crucial in achieving the low distortion and high efficiency these amplifiers are known for. Their products not only deliver exceptional audio quality but are also designed to operate reliably over long periods, with minimal maintenance.

Among the trademark technologies is the Adaptive AutoBias system. This unique feature allows users to change tubes easily without the need for manual bias adjustments. The amplifier automatically adjusts to the new tubes, maintaining optimal performance and sound quality. This technology embodies PrimaLuna's philosophy of user-friendliness combined with superior engineering.

Another significant characteristic of PrimaLuna amplifiers is the "Smart Watt" technology. This innovative design enables the amplifiers to operate in triode and ultralinear modes with a simple switch, allowing users to select between powerful output and a more refined, softer sound. This versatility caters to various listening preferences and musical genres, making PrimaLuna amplifiers adaptable to any environment.

The build quality of PrimaLuna products reflects a commitment to durability and aesthetics. The chassis are crafted from heavy-gauge steel, ensuring that the internal components are protected and the overall structure remains sturdy. Additionally, the elegant design with polished finishes and glowing tubes creates a visually appealing piece of equipment that fits seamlessly into any audio setup.

From entry-level models to high-end systems, PrimaLuna USA offers a range of products that cater to different needs while maintaining a focus on sound quality, longevity, and user convenience. Their dedication to innovation, combined with a rich heritage in audio design, continues to position PrimaLuna as a leader in the tube amplifier market, attracting both newcomers and seasoned audiophiles alike.