Detail 01
A.F. beam pentode
This is the tube type specified for the 6550-TK.
Product detailSKU #1500000448978
TELEFUNKEN6550-TK Power Tubes Quad
1/2
Independent shopping perspective
The Korena take
TELEFUNKEN 6550-TK is a quad of A.F. beam pentode power tubes for guitar amplifiers and Leslie speaker systems. Manufactured with JJ Tubes in Slovakia, each tube is evaluated for transconductance, gain, noise, and microphonics. The 6550 format is presented as a higher-gain, more stable development related to the 6L6, with a history in demanding amplification applications. Its indirect heater can operate on either AC or DC.
Strong match
Who this is for
- Guitar amplifier or Leslie speaker-system applications that use 6550 power tubes.
- Amplifier service work where AC or DC heater operation is part of the required setup.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Indirect heater; AC or DC operation
The heater is specified to operate from either AC or DC.
Detail 03
Performance testing
Each tube is tested for transconductance, gain, noise, and microphonics.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How many 6550-TK tubes are included?
This SKU is a quad of 6550-TK power tubes.
02What applications are listed for the 6550-TK?
The listed applications are guitar amplifiers and Leslie speaker systems.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsPickups & controls
- Pickup Configuration
- SS
1 detailsBody & build
- Type
- A.F. beam pentode
5 detailsOther
- Heater Requirements
- Indirect, operable with A.C. or D.C.
- Production
- Manufactured in partnership with JJ Tubes
- Origin
- Developed by Tung-Sol in 1955
- Testing
- Each tube undergoes performance testing for transconductance, gain, noise, and microphonics
- Applications
- Guitar amplifiers, Leslie speaker systems
