Our tubes are tested using our Mercury portable tube tester. It analyzes electron emissions as well as any filament short circuit.

When possible, we sell our tubes in pairs, for optimal buyer satisfaction because these are old electronic components and a defect is always possible.

When only one tube is on sale, it usually means I only have one unit on hand.

Check our store sales for more available tubes and many electronic components and varieties.

Thanks for looking!

SHIPPING TO USA FROM CANADA via USPS Ground Advantage service using a local forwarder service.

Because we are in a Country area, we have a handling time for shipment.

SHIPPING To CANADA: Flat $14.00. If you're Canadian and living in a major city, contact me. I may have better shipping rates for you, depending on the city area.