The Tung-Sol 5998 Top Getter is a truly great tube. It is exceptionally well-balanced, delivering a smooth performance without even a hint of sharpness or grain in its voice. When compared directly to other heavyweights like the RCA 6AS7, Svetlana 6N13P, and Raytheon 6080, the Tung-Sol stands out with its unique ability to remain dynamic yet warm (but never overly so).
Its character is versatile; the gentle, laid-back style is superb for vocal jazz, yet it remains very capable and punchy enough for rock music. It maintains a good balance across the entire audible spectrum. While the price difference compared to more common tubes is something each listener must weigh for themselves, at a fair price, it is a fantastic addition to any high-end amplifier.
Tung-Sol: A Legacy of Reliability
Tung-Sol played a vital role in military and industrial electronics throughout the mid-20th century. As a primary contractor for the U.S. government, they specialized in “ruggedized” designs intended for extreme environments. These tubes were engineered to withstand the high vibration and thermal stress found in aircraft radar, shipboard communications, and missile guidance systems. The military-grade construction—often featuring extra structural supports and superior glass—ensured that Tung-Sol tubes provided the unfailing reliability required for mission-critical hardware, a quality that translates today into long-lasting, low-noise performance for audiophiles.
What Makes the 5998 Special vs. the Standard 6AS7?
While often used interchangeably in the same circuits, the 5998 is a significant upgrade over the standard 6AS7. The primary difference lies in the amplification factor (mu). While a standard 6AS7 typically has a mu of 2, the 5998 boasts a mu of approximately 5.4. This higher gain allows for better drive and improved dynamics. Furthermore, the 5998 was built with significantly lower internal resistance and better linearity. This results in a sound that is noticeably sweeter than the Svetlana and more transparent than the standard RCA 6AS7, offering a “Mullard-like” presentation that is both detailed and relaxed.
Final Verdict
The Tung-Sol 5998 is a powerhouse of musicality. It effectively adds a “new layer” to the sound, providing a level of transparency and sweetness that standard power triodes simply cannot match. If you are looking to elevate your amp’s performance with a tube that is both rugged and refined, this is a highly recommended choice.
From another site: Now, about the sound. All the “rumors” about SQ getting better with the 5998 tube are true 🙂 It feels that another layer has been added to the sound. It sounds sweeter than Svetlana and more transparent and dynamic than the 6as7. If I can compare the 3 tubes to 12ax7: Svetlana is like Telefunken – clear etched sound, RCA is like… RCA Smiley warm and juicy, but not very transparent – also noisier than the other two; Tung-Sol is like Mullard – very transparent and dynamic, but relaxed.
(23 votes, average: 3.26 out of 5)
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The Tung-Sol 5998 Top Getter is a truly great tube. It is exceptionally well-balanced, delivering a smooth performance without even a hint of sharpness or grain in its voice. When compared directly to other heavyweights like the RCA 6AS7, Svetlana 6N13P, and Raytheon 6080, the Tung-Sol stands out with its unique ability to remain dynamic yet warm (but never overly so).
Its character is versatile; the gentle, laid-back style is superb for vocal jazz, yet it remains very capable and punchy enough for rock music. It maintains a good balance across the entire audible spectrum. While the price difference compared to more common tubes is something each listener must weigh for themselves, at a fair price, it is a fantastic addition to any high-end amplifier.
Tung-Sol: A Legacy of Reliability
Tung-Sol played a vital role in military and industrial electronics throughout the mid-20th century. As a primary contractor for the U.S. government, they specialized in “ruggedized” designs intended for extreme environments. These tubes were engineered to withstand the high vibration and thermal stress found in aircraft radar, shipboard communications, and missile guidance systems. The military-grade construction—often featuring extra structural supports and superior glass—ensured that Tung-Sol tubes provided the unfailing reliability required for mission-critical hardware, a quality that translates today into long-lasting, low-noise performance for audiophiles.
What Makes the 5998 Special vs. the Standard 6AS7?
While often used interchangeably in the same circuits, the 5998 is a significant upgrade over the standard 6AS7. The primary difference lies in the amplification factor (mu). While a standard 6AS7 typically has a mu of 2, the 5998 boasts a mu of approximately 5.4. This higher gain allows for better drive and improved dynamics. Furthermore, the 5998 was built with significantly lower internal resistance and better linearity. This results in a sound that is noticeably sweeter than the Svetlana and more transparent than the standard RCA 6AS7, offering a “Mullard-like” presentation that is both detailed and relaxed.
Final Verdict
The Tung-Sol 5998 is a powerhouse of musicality. It effectively adds a “new layer” to the sound, providing a level of transparency and sweetness that standard power triodes simply cannot match. If you are looking to elevate your amp’s performance with a tube that is both rugged and refined, this is a highly recommended choice.
From another site: Now, about the sound. All the “rumors” about SQ getting better with the 5998 tube are true 🙂 It feels that another layer has been added to the sound. It sounds sweeter than Svetlana and more transparent and dynamic than the 6as7. If I can compare the 3 tubes to 12ax7: Svetlana is like Telefunken – clear etched sound, RCA is like… RCA Smiley warm and juicy, but not very transparent – also noisier than the other two; Tung-Sol is like Mullard – very transparent and dynamic, but relaxed.