Excellent linearity, power and dissipation. Rugged with four pillar construction for mica supports. Excellent for guitar amps. Formed glass shape. Price is for a matched pair.

Price is for a matched quad of Electro-Harmonix 6550EH.

Price is for a matched sextet (6 tubes) of Electro-Harmonix 6550EH.

Brand new release of the "Russian Issue" Tung-Sol 6550. Nice controlled punchy bass in HiFi amps, agressive and full tone in Marshalls. Has the retro-classic Tung-Sol shape.

Price is for a matching quad of newly issued Tung-Sol 6550.

Price is for a matching sextet (6 tubes) new issued Tung-Sol 6550.

Back in stock by popular demand, and at a lower price!
Sovtek 6550WE is an excellent choice for guitar and bass amps. When pushed, it gives you that raw crunch. Also ideal for HiFi amplifier replacement purposes.

Price is for a matching quad (set of 4 tubes) of Sovtek 6550WE

Price is for a matching sextet (set of 6 tubes) of Sovtek 6550WE.

Excellent sounding 6550C, quoted as best sounding by Ken Stevens of Convergent Audio Technology. Excellent reliability, great tonality. It's a great step up from Sovtek 6550WE. Price is for a matched pair.

Price is for a matched quad of Svetlana 6550C. Super well made, heavy duty and excellent balanced sonics.

Price is for a matched sextet (6 tubes) of Svetlana 6550C.

Shipped as OEM original output tubes on many high-end amplifiers, SED6550C is the top choice for audiophile application with crisp top end and deep full bottom end response. On guitar and bass amps, SED6550C provides rich, clean, rull power with plenty of headroom. Price is for a matched pair.

Price is for a matched quad.

Price is for a matched sextet (six tubes).