Electro-Harmonix 6550 Power Vacuum Tube (Matched)

2 Reviews
SKU: EH-6550

Availability: Usually ships within 24 hours.

USD $‎69.95

Need matched power tubes? Don't worry! Price includes matching in any quantity you need for no extra charge. Need a matched pair? Just order "2" tubes. For a matched quad order "4" tubes. Matched sextets and octets are available as well.

This is the latest 6550EH vacuum tube for home audio amps from Electro-Harmonix. The Electro Harmonix 6550-EH power tubes have excellent linearity, power handling capacity and heat dissipation. Four-pillar construction and mica spacers help maintain a rugged mechanical reliability. Classic tone is sustained at a prolonged, high output. A new leaded glass compound is utilized to maintain vacuum integrity, balanced performance and ensure long life.

Other Electro-Harmonix tubes6550 Tube Types

Additional Information and Downloads 

Tube Matching Information: 
Power Tube Matching FAQ
Perfect Pair System

Electro-Harmonix 6550 Datasheet (PDF)

Download Adobe Acrobat PDF reader

Warranty Information and Return Policy

Warranty Period: 3 months

All our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)

If you receive a tube that does not perform to the manufacturer's specifications, please do the following:

- contact us to get a return authorization
- return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.

Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.

We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.

These guidelines may be updated without notice.

Ratings & Reviews

2 reviews

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Electro-Harmonix 6550 | Excellent


There's a reason Audio Research voices some of their amplifiers on these EH-6550 tubes. Consistent supply, stout & electrically predictable, these are a excellent choice for hifi applications. Recommended.



Used these for years in different applications; never a failure other than normal wear after a few years.The sound may be a bit darker than some but plenty loud.