Power · Beam power tetrode
6550
High-power beam tetrode used in hi-fi and bass amplifiers.
Base: Octal
- Specs not yet verified against a datasheet
- No replacement verified yet
Where to buy 6550
- ReverbNo affiliate relationshipSearch 6550 on ReverbOpens reverb.com search results
Online marketplace for new and used music gear, including vacuum tubes.
- Apos Audio isn't listed: its site search didn't return a 6550 when we checked on Nov 4, 2026.
Each button opens that retailer's own search for 6550. We don't see their prices or stock.
Before you buy, check that the listing names 6550. A listing that mentions another tube name isn't necessarily the same type. Affiliate disclosure
Specifications
Not yet verified
Electrical specifications are pending verification against a manufacturer datasheet. We don't publish numbers until they have a cited source.
Common uses
- hi-fi power amp
- bass amp
Replacing a 6550
A tube that fits the same socket is not automatically a safe replacement. Heater voltage, pin connections and electrical ratings must match what your amplifier is designed for. Check your amp's manual or a qualified technician.