TUNG-SOL 6528A Rugged Nos Triode Tubes Vacuum

( Brand: Tung-sol ), ( Type: Nos Tube ), ( Country/region Of Manufacture: United States )

Review TUNG SOL Rugged Nos Triode Triodes Pair Output Tubes 6528 Vacuum

The 6528A Rugged NOS Triode Triodes Tungsten Vacuum Tubes are a vintage yet reliable solution for audio and electronic enthusiasts seeking a classic, high-quality sound. These tubes are known for their robustness and durability, making them ideal for applications where reliability and longevity are paramount.

The 6528A is a triode vacuum tube, meaning it has three electrodes: a cathode, an anode, and a grid. This particular type of tube is a tungsten-filament triode, which provides a stable and consistent performance over time. The filament is made of tungsten, a material that has a high melting point and a long lifespan, ensuring the tube can withstand various operating conditions.

The 6528A is a high-gain, low-noise tube, making it an excellent choice for applications such as audio amplifiers, radio transmitters, and vacuum tube oscillators. Its high gain allows it to amplify weak signals, while its low noise ensures that the amplified signal is clean and free of unwanted distortion.

The 6528A is a New Old Stock (NOS) tube, meaning it is a reissued vintage tube that has been stored in a controlled environment since its production. This ensures that the tube is in its original condition and has not been exposed to the elements, which can degrade the tube's performance over time.

The 6528A Rugged NOS Triode Triodes Tungsten Vacuum Tubes are not just a piece of vintage technology, but also a testament to the craftsmanship and engineering that went into creating these tubes. They are a must-have for any audio or electronic enthusiast who values the rich, warm sound that only vacuum tubes can provide.

1. Authenticity: NOS (New Old Stock) tubes are original vintage components that have been stored in a dry, controlled environment since their production. They have not been exposed to modern manufacturing processes or materials, ensuring their purity and original sound quality.

2. Reliability: NOS tubes are often considered more reliable than modern tubes, as they are less likely to suffer from burn-in or degradation over time.

3. Collectibility: Vintage tubes like the 6528A can be highly collectible, adding value to your audio system and potentially increasing its resale value.

4. Sonic Character: NOS tubes are known for their warm, rich, and detailed sound, which can provide a unique and enjoyable listening experience.

1. Cost: NOS tubes can be significantly more expensive than modern tubes due to their rarity and the cost of maintaining and storing them.

2. Availability: Due to their rarity, it can be difficult to find specific NOS tubes, including the 6528A, and you may have to wait for them to become available or pay a premium for them.

3. Compatibility: NOS tubes may not be compatible with all modern equipment, so it's essential to ensure that the tube you're purchasing is compatible with your amplifier or preamp.

4. Maintenance: Vintage tubes require more maintenance than modern tubes, including regular cleaning, alignment, and replacement of filaments, which can add to their overall cost.

If you're looking for a unique and rich sounding audio experience, and you're willing to invest in the cost and maintenance of NOS tubes, then the 6528A Rugged NOS Triode Tubes could be a great addition to your audio system. However, it's essential to do your research and ensure that the tube is compatible with your equipment and that you're willing to invest in its maintenance.

If you're interested in purchasing 6528A Rugged NOS Triode Tubes, we recommend doing your research and finding a reputable vendor who specializes in NOS tubes. Make sure to ask about the tube's history and condition, and consider investing in a tube tester to ensure that the tube is functioning properly before using it in your audio system.

Details:

The approximate output in watts RMS is about 30, 22, and 16 respectively. If you really push 'em hard into a 3300 ohm tapped output transformer, power output would be about 28 watts . The red dot above 400 volts is a possible idle current setting. The formulas found in some tube manuals would calculate out to a larger output in watts , but doesn't account for circuit losses in the output transformers and so on.

Solid and strong. I cracked a used one open and they are built like the proverbial brick outhouse. Made with Solid graphite plates, giant cathodes, and a hard glass tube envelope.

The pair shown above put out about 17 watts per channel, and always sounded much bigger, and never sounded under powered, even into my celestial Del 5 speakers, which are not very efficient. These are state of the art triodes. With about 43 volts on the grids, the tubes will draw about 70ma each, and dissipate a conservative 24. I bought up these nos 6528s to build a pair of triode amps.

It is rated for 400 volts on the plate, and each triode can dissipate 30 watts , or 60 watts total. It is a twin triode two big, rugged, durable power triodes inside a single tube. At 400 volts , and a grid bias voltage of about 50v, the tubes will idle at about 60ma, for a conservative idle dissipation of 24 watts per tube, well below the 30 watt maximum. I had designed and built several tube amps earlier, including a pair of push pull triode mono blocks, one shown above.

These figures are pretty close to real world. The formula I used here is a conservative one. But they sounded so good I couldn't quite find the time to tackle another push pull triode project. A pair of nos new old stock Tung Sol 6528A vacuum tubes.

Above are 400 volt plate family curves, and load lines for push pull audio outputs with output transformers of 4500 ohms, 6600 ohms, and 10,000 ohms tapped. I used triode connected horizontal deflection tubes with a b of 350 volts . With 4500 ohm, 6600 ohm and 8000 ohm tapped push pull output, the powers would be about 22, 17, and 14 watts respectively.

Amplification factor mu is about 9 and trans conductance is about 37,000 um hos. Above, same story except with a more conservative b supply at 350 volts . The 6528 is maybe the ultimate power triode. See my other listings for another pair of 6528 tubes, a quad of 7236 twin power triodes, and a nice pair of nos heath stance push pull output transformers.

5 watts each, again well below the 30 watt maximum.

part #: 6528a prices

• $39.95-$89.95

specifications tubesocketvintagego:

• brand: Tung-sol
• type: Nos Tube
• country/region of manufacture: United States

Seller:

• zipcode: 97352
• city: Jefferson, Oregon

Payments:

• PayPal

Shipping:

• type: Calculated
• handling: 2 days

Offer:

• min. bid: $50.00
• Started: January 18, 2015, 3:27 am
• # Sold: 0
• quantity: 1
• # bids: 0
• best offer: false

General:

• Consumer Electronics > Vintage Electronics > Vintage Audio & Video > Vintage Parts & Accessories > Vintage Tubes & Tubes Sockets
• in stock: Yes

Returns:

• policy: no returns

Ratings:

1. wonderful care of machine and exactly as described. Well packaged. 01-10-15
2. Rec'd in 2.5Days!Outstanding superfast service,great item as described!Thanks!!! 01-08-15
3. A+++ Chalkblue is a Superb. Hope to buy again from you!!!! thx. 01-17-15
4. Thank you so much!!! Very fast delivery!!! Arrived in excellent condition!!! 01-08-15
5. Prompt shipping, supreme package, fully recommended! A++++++ 01-12-15

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