Orders placed after 4PM on weekdays will not ship until the next business day. Orders placed after 11AM Fridays will not ship until the following Monday.
Faster shipping methods may be available; just upgrade during checkout.
*Some exclusions apply.
Enter new zip code to refresh estimated delivery time.
The 6550-TK Black Diamond Series Vacuum Power Amp Tube from Telefunken is based on the Tung-Sol 6550, originally designed for industrial applications, which took its influence from the 6L6 tube. Its high output makes it suitable for guitar amps and Leslie speaker systems, and is marked by a long life characteristic.