NOS Tung-Sol 6550 Smooth Grey Plate Plate Strong mA and Gm Vintage USA Vacuum Tube

PHOTO IS OF GREY PLATE 3  HOLE VERSION, YET THEY ARE OUT OF STOCK. This listing is now for a grey smooth plate version. 

Reach out if you are having trouble adding more than 1 to your cart!

We are able to match PAIRS only. Please reach out if you need a tightly matched set of 4! WE WILL DO OUR BEST TO MATCH LOGOS AND Date codes.

We will match for free! Simply add more than one item to the cart, and let us do the rest.

Welcome to Fuzz Audio - Please Read Our Shipping Terms, Our Testing Standards, Our Return Policy (30 Day Any Fault) and Our Great Reviews.  

We have many of these tubes in stock. We will match all tubes with purchase of 2 or more! 

Do not hesitate to reach out if you have any questions or concerns, we are here for you. And please let us know if you have issues buying multiple tubes. 

Tube in photo represents tube you will receive. Getter construction or logo may differ. Logo may be wiped off or weak. 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.

Tubes are thoroughly tested on industry standard tube analyzers. We guarantee NOS test scores, no microphonics (noisy tubes), clean pins, tight matches, and ultimately that they work in your application or YOUR MONEY BACK!

Tube Type / Number: 6550 Smooth Black Plate
Manufacturer:  Tung-Sol
Country of Manufacturer: USA

Tests as NOS?: Yes

At Fuzz Audio:

·      All tubes are tested on a calibrated Hickok 539C, Maxi-Matcher, or other industry standard testers

·      Tubes are guaranteed for 30 days

·      Preamp tubes 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 audio applications

Do not buy power or  preamp tubes that have been tested solely  on an emissions tester or “tube checker”- this is an inadequate test.

If you have any questions, please do not hesitate to reach out. We would love to hear from you!

Shipping:

All orders shipped within 30 business days, 90% of orders are processed within 24 hours. Inquire for express shipping. International shipments MAY take a few weeks to arrive.

Tubes are packed with utmost care. In large sturdy boxes.

Return Policy:              

30 day returns.