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.
- 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.
- 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.
- 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.
- 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.
At Fuzz Audio, all vintage/NOS vacuum tubes purchased through our website are guaranteed for one year from purchase date. We accept returns for tubes going noisy, losing output/performance prematurely, and of course losing function all together. (Read about power tubes below).
We will not cover damage from red plating neglect, glass breakage of any kind, loose bases, or other obvious faults that are due to neglect, rough handling or egregious constant use.
This policy is meant to protect the buyer from having a tube go out on them prematurely from a flaw we missed. Tubes, especially preamp tubes, should last half a lifetime, and well beyond a year, so we want to guarantee each customer that you get a tube that will last.
For power tubes, although we will honor any faults mentioned above, we will not accept a return for a power tube that has obviously been used for 6+ hours a day for every day of the year for one year. Power tubes that have clearly been used beyond their normal wear point will not be accepted.
If you suspect one of your vintage Fuzz Audio tubes has gone bad within one year of purchasing, simply reach out via our chat or at Support@fuzzaudio.com and we will assist you in the warranty exchange process. No receipt is needed.
Please note, it is possible we will be out of stock of the tube that is in need of a swap. If this is the case, we will either offer a refund, credit, different tube, or send the first available tube of that type when it comes back in stock.
If you have any questions or concerns, please reach out!
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.
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be in the same condition that you received it. It must also be in the original packaging.
- Downloadable software products
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
- Book with obvious signs of use
- CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at Support@fuzzaudio.com.
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at Support@fuzzaudio.com and send your item to: 7901 E Belleview Ave, Apt. 318, Englewood CO 80111, United States.
To return your product, you should mail your product to: 7901 E Belleview Ave, Apt. 318, Englewood CO 80111, United States
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.