Sylvania 5U4GB

Sylvania 5U4GB Black Plate Rectifier Vintage Vacuum Tube

Excellent rectifier option for any 5U4GB application. 

Sylvania NOS tubes are hardy and can last a lifetime!

We do not have original boxes for all vintage tubes. If you require an original box, we will do our best to supply one. Contrary to popular belief, roughly 70% of vacuum tubes did not come from the manufacturer individually boxed. Most tubes were manufactured for industrial use and were shipped and stored in large cardboard boxes with lipstick dividers. 

Note: Pre-amp tubes do not need to be matched for 90+% of applications.

All of our tubes are thoroughly tested. No tube tester is perfect, we often test tubes on several different industry grade testers to ensure you get a quality valve. 

We guarantee your tube to be 100% operational! If it is not we will give you a full refund.

Need help deciding what tubes are best for you?

Use our plate cheat sheet and vacuum tube buyers guide to determine which tubes are best for you. Likewise, you are welcome to reach out to us directly at Support@FuzzAudio.com or by using our chat located on our shop page if you have further questions.

NOS vs. ANOS vs. Test NOS

These designations are strictly used to describe the cosmetic condition of our tubes. All tubes we sell test identically, come with 100% life and are guaranteed to work in your device!

If you are picky about owning an original box or wanting a specific logo please reach out to us before purchasing.

1. NOS (New Old Stock) Tubes- are 100% brand new vintage tubes in mint cosmetic condition with show zero signs of use. You should expect a legible logo and clean straight pins. An original box is likely but not guaranteed. 

2. ANOS Tubes- otherwise known as “almost new old stock” tubes are basically new, but may show slight signs of use in cosmetic condition, such as a missing logo or slightly bent pins. An original box is possible but unlikely. 

3. Test NOS Tubes- are used but still operating to specification with 100% life. These tubes are equal in function to NOS valves, yet they cost considerably less because they have cosmetic blemishes. If you plan to disappear your tubes into the back of an amplifier or do not care what the tubes look like, then this is cost effective choice. Blemishes and cosmetic imperfections do not affect tone…

Logos: Vintage tubes were have a wide variety of logos printed on them. It is not uncommon to see a Mullard made tube with an RCA or GE logo, or a GE made tube with a Mullard logo. Your tube may come with a logo such are Heath Kit, Baldwin, Fisher, Hammond, Magnavox, Fender, Gibson, Silvertone, etc. but the true manufacturer of that tube will be correct to your order. If you are looking for a specific logo please reach out before purchase.

Our Standards:

• All tubes are tested for microphonics and are guaranteed to work in sensitive audio applications
• All tubes sold are guaranteed to have strong (to spec) NOS test scores with 100% life
• All tubes are tested on a calibrated Hickok 539C, Maxi-Matcher, E-Tracer or other industry standard tube analyzers
• Tubes are guaranteed for one year and can be returned within 30 days
• Preamp tubes matched by gain and mutual conductance (Gm)
• Power tubes matched by mA and Gm

Don’t forget to email Support@fuzzaudio.com or reach out to us via chat if you need help picking out valves for your device.