A Vacuum Tube Amplifier Worthy of Being Recorded in History Has Emerged.

This amplifier brings together a total of 18 transformers (input, interstage, output transformers; first, second, and third power transformers; first and second choke transformers; output vacuum tube heater choke transformers) and over 300 electronic components. Among these, all 18 transformers use nickel amorphous cores and were developed in-house rather than outsourced. It can truly be called a symphony of transformers, and the core of the sound lies within these transformers.

A product worthy of being recorded in the history of vacuum tube amplifiers has appeared, both domestically and internationally. Remarkably, it is a triode amplifier boasting a massive 160W output in Class A operation. This is likely an unprecedented model worldwide. This unit is a limited-production, precision handmade product and the latest model from Apollon (formerly UL Sound), which has already established itself as a leading name in Korean vacuum tube amplifiers. It is a masterpiece infused with the 25 years of expertise of its longest-serving representative. The name “Daphne” means “laurel” in Greek and has a deep connection to Apollo in Greek mythology. It also hints at the maker’s intention to challenge the laurel wreath as the ultimate symbol, akin to the Olympic highest honor.

Apollon’s products have already formed a solid fan base due to their unique beauty, unmatched high-quality craftsmanship, and finish, rising to a level that is almost symbolic of Korean vacuum tube audio. While many world-renowned vacuum tube models have been reviewed, it has often been experienced that despite their exorbitant prices, they fail to match the nobility of Apollon’s Noble amplifier. This is not nationalism but an evaluation from a strictly objective perspective.

Although this is a power amplifier, it features a unique design with a separated power supply, resulting in a total weight of nearly 70 kg per channel and four separate units. The output tube used, the 838, is also unusual. Developed as a transmitter tube in the U.S., it is rare and has never before been used in an amplifier. A few years ago, a monk built one himself and posted it on YouTube, which caused a stir, but output tubes like this are hard to come by domestically. However, the developer recognized the true value of this tube long ago and secured a substantial stock, so users need not worry, and the tube’s lifespan is quite long.

The 838 is a high-voltage tube in the same family as the 845 and 211, and among triodes, it resembles the tonal character of the 2A3. Experts say it is the progenitor of the 2A3. The 2A3, renowned for its unrivaled jazz reproduction, has a unique charm with its dark, weighty sound and the subtle breath-like air flow through the respiratory system, but it is too low-powered (around 3W) to be commercially viable. The 838 is essentially the origin of that low-power tube and shares many similarities. This listening unit capitalizes on that attractive sound while dramatically increasing output. Previously, the maker created a single mono-block power amplifier using this tube (output 45W), and now, building on that momentum, has completed this high-output model. It is also said to be the first to use the UX250 as the driver tube.

The manufacturing process was reportedly challenging. Initially, a prototype was made using the 845 output tube for high power, but it was criticized for ordinary sound quality. After much deliberation, the output tube itself was replaced, and after six months of repeated tuning, the final product was released. Typically, producing such high output in Class A results in runaway heat that causes shutdown within five hours. However, this amplifier can run comfortably for 24 hours straight. During the review, it was warmed up and operated for over six hours, yet the transformers did not become excessively hot. This is due to a special heat treatment system. The structure features a patented chimney-like heat dissipation system above the transformers, which a specialist who examined the design praised as brilliant thermal management.

This amplifier combines a total of 18 transformers (input, interstage, output transformers; first, second, and third power transformers; first and second choke transformers; output vacuum tube heater choke transformers) and over 300 electronic components. All 18 transformers use nickel amorphous cores and were developed in-house, not outsourced. It can truly be called a symphony of transformers, and the core of the sound lies within these transformers.

Most amplifiers using high-voltage tubes are difficult to control for hum. About 20 years ago, an enthusiast built an amplifier using the high-voltage 211 tube, which sounded good but was eventually abandoned due to worsening hum (that model had an output of about 10W). Despite its high output, this amplifier is astonishingly quiet. Its quietness makes even upbeat Korean pop songs sound like precise classical vocals. This is thanks to its precise hum control function. Another major advantage is that the output tubes can be adjusted by referencing the analog meters without any special equipment.

This amplifier was connected to the newly released Eagles Tone Works Savoy Signature SE speakers. With a sensitivity of 87dB and a total of nine drivers, including mid-bass and bass drivers arranged in an isobaric configuration, these speakers are a fortress that is difficult to drive with most amplifiers. However, this Class A 160W vacuum tube amplifier reveals what the world of vacuum tube amps is truly about for the first time. Although the speakers are large, even in the spacious interior of 21 Sound, the official direct dealer located in Seongsu-dong, the soundstage forms effortlessly and naturally without any resistance. Even non-jazz vocals become a vast ocean with their unique magical sound, the piano sounds majestic, and the solo strings seem to push the heart outward. The subtle and exquisite handling of vocals especially stands out, unveiling a new world of triode Class A high power. This is a must-listen for vacuum tube enthusiasts. It will let you experience a sea of sound.

— Written by Nam Kim, Audio Critic —