Many of our users choose these for the very rich bass tones and detailed mid-range. This 6550 is a good facsimile of the original Marconi design and unbeatable at this price for ruggedness and reliability.
[please note they are only sold in very closely matched pairs or quads].
For a full spec, visit the product page.
These Items are shipped as a Matched Pair which means that they will be tested and verified to have the same gm value. The benefit of matching your amplifier valves is so that they share the work load and therefore work more efficiently and last longer.
Each tube is scrupulously tested and only the best get badged with the Brimar thermionics logo. We hope you enjoy our selected products and with each purchase you will be bringing us closer to British valve manufacturing again.