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Monday 10am - 9pm Tuesday 10am - 9pm Wednesday 10am - 9pm Thursday 10am - 9pm Friday 10am - 9pm Saturday 10am - 9pm Sunday 10am - 6pm

Tubes Unlimited

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United States
Houston, TX
Tubes Unlimited

Vacuum Tube Supplier for Audio Hifi and Guitar Amplifiers Our selection of audio vacuum tube types are as BIG as the Lone Star State! We ship WORLDWIDE!!!

Easy and Safe, 100% Secure Online Ordering for all of your Vacuum Tube needs! Some of the Rarest NOS audio vacuum tube types you will see online!! Highest Quality- We specialize in Rare, High Quality, NOS audio vacuum tube types! We 100% Test each vacuum tube to assure you the best quality possible! Ultra-Safe Packing- All vacuum tube orders Professionally Packed For Safe Arrival! Super Fast Shipp

ing- Most vacuum tube orders shipped same day! If you are looking for any kind of NOS audio vacuum tube like 12ax7 12AT7 12AU7 5751 6L6GC 6V6 E188CC 6DJ8 6922 E88CC 6SN7 etc we probably have the vacuum tube you are looking for! We specialize in the rare, high quality NOS audio vacuum tube brands like Mullard, Telefunken, Brimar, GEC, GE, Sylvania, RCA and more! Check out our huge variety of all audio vacuum tube types! Each vacuum tube we sell is completely tested for shorts, gas, leakage, and transconductance on our "unforgiving" calibrated Hickok 118B cardmatic vacuum tube tester. Also, check out our wide array of NOS 12ax7 vacuum tube products and drop in replacements for the 12ax7 like our GE JAN 5751. If you need a matched pairs of a 12ax7 vacuum tube, we have them from Telefunken 12ax7, GE 12ax7, RCA 12ax7, Brimar 12ax7, Sylvania 12ax7 and more! We also carry RCA, Tung-Sol, Sylvania, GE, Raytheon, JAN, Mullard, Genalex, Philips, Siemens and other vacuum tube brands. If you don't see the type of vacuum tube you are looking for then email us! We have over 4000 NOS audio vacuum tube types in stock!

09/02/2026

How to Test Vacuum Tubes: Complete 2026 Testing Guide

Learn how to test vacuum tubes properly at real-world voltages. After 45 years testing tubes, I'll show you what $300 testers miss and why voltage matters.

09/01/2026

5U4GB Tube: Why Classic Tube Rectification Still Matters

Learn why the 5U4GB tube creates authentic vintage guitar amp tone. Voltage sag characteristics, NOS quality differences, and professional installation guide.

08/31/2026

Hi-Fi Vacuum Tubes: The Complete 2026 Audiophile Guide to Tube Selection

Selecting hi-fi vacuum tubes for audiophile systems: NOS brands, tube types, testing standards, and system matching guidance from 45 years experience.

08/30/2026

Pentode Tube: Complete Guide to 5-Element Power Amplification

Stop treating pentode tubes like simple power upgrades. Learn why the screen grid and suppressor grid matter, how pentodes actually clip, and which tubes fit your amp

08/29/2026

Vacuum Tube Care & Maintenance: Complete 2026 Preservation Guide

Negligence kills more good tubes than wear ever will. 45 years of hands-on vacuum tube maintenance knowledge to keep your NOS glass performing for decades.

08/28/2026

Why Do Tubes Sound Better? The Science of Harmonic Distortion 2026

Why do tubes sound better than solid-state? The science of even-order harmonics, soft clipping, and tube warmth explained by 45-year audio veteran.

08/27/2026

How to Choose Vacuum Tubes: Complete 2026 Selection Guide

How to choose vacuum tubes: matching for push-pull amps, NOS vs modern production, real-world voltage testing, and picking brands for your amplifier.

08/26/2026

572B Tube: Why Ham Radio Operators Choose This Transmitting Tube

Why ham radio operators choose the 572B tube for kilowatt amplifiers. Expert guide to specs, performance, and proven reliability from 45 years tube experience

08/25/2026

Best Vacuum Tubes by Application: Expert Recommendations 2026

Best vacuum tubes? Wrong question. 45 years experience reveals which tubes actually work for YOUR amplifier. NOS testing, 100K inventory, real expertise—not generic lists.

08/24/2026

RF Power Tubes: Complete 2026 Guide to High-Frequency Amplification

RF power tubes handle kilowatts at megahertz frequencies where solid-state fails. Complete guide covering applications, cooling, and why tubes still dominate.

Address

6527 Kury Lane
Houston, TX
77008

Opening Hours

Monday	10am - 9pm
Tuesday	10am - 9pm
Wednesday	10am - 9pm
Thursday	10am - 9pm
Friday	10am - 9pm
Saturday	10am - 9pm
Sunday	10am - 6pm

Website

http://www.nosvacuumtubes.net/

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