Power · Directly heated triode
300B
Directly heated power triode used in single-ended hi-fi amplifiers.
Base: 4-pin (UX4)
- Specs not yet verified against a datasheet
- No replacement verified yet
Where to buy 300B
- Apos AudioNo affiliate relationshipSearch 300B on Apos AudioOpens apos.audio search results
Online audio retailer. Its catalog includes new and new-old-stock (NOS) vacuum tubes, such as 12AX7, 12AT7 and 12AU7 types.
- ReverbNo affiliate relationshipSearch 300B on ReverbOpens reverb.com search results
Online marketplace for new and used music gear, including vacuum tubes.
Each button opens that retailer's own search for 300B. We don't see their prices or stock.
Before you buy, check that the listing names 300B. 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
- single-ended hi-fi amp
Replacing a 300B
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.