GREENSTONE USA is fast becoming the leader in the Vacuum Tubes & Vacuum Capacitor industry. Our research and development program has allowed us to stay one step ahead of the competition by manufacturing quality Vacuum Tubes and Vacuum Capacitors that are beyond compare for the last 25 years.
Whether it is your guitar amplifier or RF Generator, GREENSTONE manufactures a Vacuum Tube for all your needs.

In addition, All of our Vacuum Tubes are new and come with the best service & warranty programs in the industry. GREENSTONE'S extensive inventory assures you that we will have the products when you need them. This allows us to guarantee same day shipping on all orders placed by 5: 00 p. M. Eastern time, which in turn guarantees next day delivery of your order.

We carry a wide selection of Radio Transmitter and TV Transmitter tubes and offer an excellent warranty period. In the event you do have special needs, GREENSTONE will custom manufacture Vacuum Tubes and Vacuum Capacitors that will fit your own application and specifications.

Whether it is an in stock item or a custom order, GREENSTONE is here to fill all of your needs and we look forward to serving you.

Greenstone carries replacement Vacuum tubes for equipment manufacturers such as: Radio Frequency Services, Alloyd, Thermex Thermatron, MarkPeri, Rosenquist, Nemeth engineering, L & L Machinery, RFC, HFT, Kabar, LaRose, Rosenquist, and many others. Our company is Beijin Branch, Greenstone USA, Inc.