Sylvania 6SN7GTB
$50.00 - $75.00
Sylvania 6SN7GTB – Vintage American Reference
The Sylvania 6SN7GTB is one of the most respected dual-triode tubes ever produced in the United States. Built during the golden era of American manufacturing, these tubes were designed for long service life, tight tolerances, and consistent performance in demanding hi-fi, studio, and military applications.
Compared to modern production 6SN7s, vintage Sylvania GTBs deliver a level of refinement that’s increasingly hard to replicate.
Why Vintage Sylvania Beats Modern Production
Modern tubes are built to hit price points. Vintage Sylvanias were built to meet standards.
The GTB features heavy internal structures, precise grid alignment, and cathode materials no longer used today. The result is:
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Lower noise floor
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Better balance between sections
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More dimensional midrange
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Smoother highs without roll-off
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Fuller, more natural bass response
Where many modern 6SN7s can sound flat or grainy, the Sylvania GTB remains open, musical, and effortless—even in revealing systems.
A True Collector Tube
The Sylvania 6SN7GTB isn’t just an upgrade—it’s a finite resource. These tubes haven’t been made in decades, and every year fewer clean, tested examples remain in circulation.
Collectors and audiophiles prize Sylvanias for:
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Consistent factory quality
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Recognizable sonic signature
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Strong demand across hi-fi, headphone amps, and preamps
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Proven longevity (often lasting many times longer than modern tubes)
As demand grows and supply continues to shrink, vintage tube prices are steadily rising. The 6SN7 family in particular has seen strong appreciation as more listeners discover how large a role this tube plays in overall system character.
An Investment You Can Hear
Buying a Sylvania 6SN7GTB today isn’t just about better sound—it’s about owning a piece of audio history that continues to gain value. Unlike modern tubes that depreciate the moment they’re installed, high-quality vintage Sylvanias remain desirable, tradable, and increasingly hard to replace.
Tested, vetted, and backed by Fuzz Audio, this is the kind of tube you buy once—and keep for the long haul.
NOS (New Old Stock)
Unused vintage tubes that were never put into regular service. These tubes are electrically new and typically show little to no wear, though cosmetics may vary due to age and long-term storage.
Tested NOS
Vintage tubes that were originally NOS but may have seen light use. These tubes test strong, meet original specifications, and are fully screened for performance and noise.
Testing Standards
Testing Standards
At Fuzz Audio:
- We match all tubes for free!
- All vintage tubes are guaranteed for one year.
- All tubes are tested on a calibrated Hickok 539C, Amplitrex, Maxi-Matcher, or other industry standard tube analyzers.
- Preamp tubes are matched by gain and mutual conductance (Gm)
- Power tubes matched by mA and Gm
- All tubes tested for microphonics and are guaranteed to work in your application.
- If you require SUPER LOW noise tubes, please reach out. We will most likely meet your requirements for free.
- Do not hesitate to reach out if you have any questions or concerns, we are here for you.
We guarantee NOS test scores, clean pins, tight matches, and ultimately that they work in your application or YOUR MONEY BACK!
Tubes in photos represent the tube you will receive. Getter construction or logo may differ. Logo may be partially missing or cleaned off. You may or may not receive a box. Tube type, manufacture, and NOS test quality will NOT change. If logos and original boxes are a deal breaker- please reach out before purchase we are always happy to accommodate.
Shipping details
1. General
Subject to stock availability. We try to maintain accurate stock counts on our
website but from time-to-time there may be a stock discrepancy and we will not
be able to fulfill all your items at time of purchase. In this instance, we will
fulfill the available products to you, and contact you about whether you would
prefer to await restocking of the backordered item or if you would prefer for us
to process a refund.
2. Shipping Costs
Shipping costs are calculated during checkout based on weight, dimensions and
destination of the items in the order. Payment for shipping will be collected
with the purchase.
This price will be the final price for shipping cost to the customer.
3. Returns
3.1 Return Due To Change Of Mind
Fuzz Audio will happily accept returns due to change of mind as long as a
request to return is received by us within 30 days of receipt of item and are
returned to us in original packaging, unused and in resellable condition.
Return shipping will be paid at the customers expense and will be required to
arrange their own shipping.
Once returns are received and accepted, refunds will be processed to store
credit for a future purchase. We will notify you once this has been completed
through email.
(Fuzz Audio) will refund the value of the goods returned but will NOT refund the
value of any shipping paid.
3.2 Warranty Returns
Fuzz Audio will happily honor any valid warranty claims, provided a claim is
submitted within 90 days of receipt of items.
Customers will be required to pre-pay the return shipping, however we will
reimburse you upon successful warranty claim.
Upon return receipt of items for warranty claim, you can expect Fuzz Audio to
process your warranty claim within 7 days.
Once warranty claim is confirmed, you will receive the choice of:
(a) refund to your payment method
(b) a refund in store credit
(c) a replacement item sent to you (if stock is available)
4. Delivery Terms
4.1 Transit Time Domestically
In general, domestic shipments are in transit for 2 - 10 days. We ship packages Tuesday-Thursday so plan accordingly.
4.2 Transit time Internationally
Generally, orders shipped internationally are in transit for 4 - 22 days. This
varies greatly depending on the courier you have selected. We are able to offer
a more specific estimate when you are choosing your courier at checkout.