TELEFUNKEN 6550-TK Vacuum Tube Single
MRP - Rs. 17,200
TELEFUNKEN 6550-TK Vacuum Tube Single: Black Diamond Series beam power tetrode, single 6550-TK tube, cryogenically treated and burned-in. Available in India from Shivansh Electronics, Kolkata, West Bengal, India.
VISUAL GUIDE — See Every Photo, Spec & Setup Step (PDF)
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General
| Type | Beam power tetrode vacuum tube |
| Series | TELEFUNKEN Elektroakustik Black Diamond Series |
| Output | 35 watts |
| Design | Based on the 6L6, with more gain and better stability |
| Typical uses | Guitar and bass amplifiers, rotary speaker systems |
| Treatment | Rigorously tested, cryogenically treated, extensively burned‑in |
| Production | New production |
Configuration
| This product | Single |
| Option on the TELEFUNKEN page | Single Tube |
| Number of tubes | 1 |
In the box
| Included | One TELEFUNKEN 6550‑TK vacuum tube |
Ordering
| Part number | TUBE‑TK08‑SINGLE |
Shipping
| Shipping weight | 0.45 kg |
Product overview
The TELEFUNKEN 6550-TK Vacuum Tube Single is the Black Diamond Series 6550, a high output power tube for guitar amplifiers and rotary speaker systems, supplied here as a single 6550-TK tube.
The TELEFUNKEN 6550-TK is a high output power tube suitable for guitar amplifiers and rotary speaker systems. Ideal for classic tube circuits, it offers outstanding performance and stability, and like every Black Diamond Series tube it is rigorously tested, cryogenically treated and extensively burned-in.
| Output, from one tube | 35 W |
| 6550 developed | 1955 |
| Tube in this product | 1 |
| Fewer tube changes | Long life |
Key features
- 6550 beam power tube (power tetrode)
- Delivers 35 watts at its output
- More gain and better stability than the 6L6 design it is based on
- Long life characteristic for fewer tube changes over the years
- For guitar amplifiers and rotary speaker systems, and high-power tube bass amplifiers
- Black Diamond Series: rigorously tested, cryogenically treated and extensively burned-in
The 6550-TK sound
The 6550 was developed in 1955 for servo amplifiers and industrial applications. The design is based on the 6L6, but with more gain and better stability. Like the 6L6, it is a beam power tube, or power tetrode, that can painlessly deliver 35 watts at its output. Bass players who know the classic high-power tube bass amplifiers know both the beauty of the 6550 sound and the raw power it delivers.
Built to last
One of the best features of the 6550 is its long life characteristic, which grants the user fewer tube changes over the years.
Applications
- High-power bass amplifier: bass players running high-power tube bass amplifiers
- Guitar amplifier: guitar amplifiers built around the 6550
- Rotary speaker system: organists and keyboard players with tube-powered rotary speaker cabinets
- Studio backline: studios keeping their 6550 amplifiers session-ready
- Live sound and touring spares: backline techs carrying replacement power tubes
- Rental inventory: rental stores retubing amplifiers between bookings
Black Diamond Series
TELEFUNKEN Elektroakustik Black Diamond Series vacuum tubes are new production tubes, manufactured in partnership with a specialist vacuum tube factory in Slovakia and designed to be harmonically rich and tonally balanced. Each tube is rigorously tested, cryogenically treated and extensively burned-in before it carries the Black Diamond name, so the 6550-TK arrives ready for the most demanding applications.
This configuration: Single
This product is one 6550-TK tube, sold singly.
Fitting and care
Always switch the equipment off, unplug it from the mains and let the tubes cool completely before removing or fitting a tube. Fit the 6550-TK only in a socket specified for the 6550, keep each tube in the position of the one it replaces, and press it straight and fully into the socket. Power sections hold high voltages, so leave any work inside the chassis, including any bias adjustment the amplifier requires, to a qualified technician. After fitting, let the equipment warm up and listen at low volume first. Store spare tubes in their packaging, protected from knocks and moisture.
What's included
| Included | One TELEFUNKEN 6550‑TK vacuum tube |
| Not included | Amplifier or equipment, sockets and installation, bias adjustment |
In the box
- One TELEFUNKEN 6550-TK vacuum tube
Vacuum tubes are glass components: handle them by the glass envelope, avoid knocks and keep them in their packaging until fitting.
TELEFUNKEN 6550-TK Vacuum Tube Single: frequently asked questions
How much power does a 6550 deliver?
TELEFUNKEN states that the 6550 can painlessly deliver 35 watts at its output.
Is it suitable for bass amplifiers?
Yes. TELEFUNKEN highlights the 6550 sound and raw power in classic high-power tube bass amplifiers, as well as in guitar amplifiers and rotary speaker systems.
What does Black Diamond Series mean?
It is TELEFUNKEN Elektroakustik's range of new production vacuum tubes, designed to be harmonically rich and tonally balanced; each tube is rigorously tested, cryogenically treated and extensively burned-in.
Do I need a technician to fit it?
Fitting is a straight swap in the socket, but power sections and rectifier circuits hold high voltages. Where an amplifier has adjustable bias, have a qualified technician check it after fitting new power tubes, following the amplifier maker's instructions.
How many tubes are included?
One tube, sold singly.
Where can I buy the TELEFUNKEN 6550-TK Vacuum Tube Single in India?
The TELEFUNKEN 6550-TK Vacuum Tube Single is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.
Workflow 1: High-power bass amplifier
Bass players running high-power tube bass amplifiers.
Connections
| Connect | To |
|---|---|
| 6550‑TK | 6550 power tube sockets of the bass amplifier |
Setup
- Switch the amplifier off, unplug it from the mains and let the tubes cool completely; power sections hold high voltages, so leave work inside the chassis to a qualified technician.
- Note each position, then gently rock the old 6550 tubes straight out of their sockets.
- Fit the 6550-TK tubes with the pins or key aligned, pressing each fully home, and refit any retainers.
- Power up and let the amplifier warm up; have the bias checked by a qualified technician where the amplifier requires it, then check the sound at low volume.
Tip: A single tube replaces one position.
Workflow 2: Guitar amplifier
Guitar amplifiers built around the 6550.
Connections
| Connect | To |
|---|---|
| 6550‑TK | 6550 power tube sockets of the guitar amplifier |
Setup
- Switch the amplifier off, unplug it from the mains and let the tubes cool completely; power sections hold high voltages, so leave work inside the chassis to a qualified technician.
- Note each position, then gently rock the old 6550 tubes straight out of their sockets.
- Fit the 6550-TK tubes with the pins or key aligned, pressing each fully home, and refit any retainers.
- Power up and let the amplifier warm up; have the bias checked by a qualified technician where the amplifier requires it, then check the sound at low volume.
Workflow 3: Rotary speaker system
Organists and keyboard players with tube-powered rotary speaker cabinets.
Connections
| Connect | To |
|---|---|
| 6550‑TK | 6550 sockets of the rotary speaker amplifier |
Setup
- Switch the amplifier off, unplug it from the mains and let the tubes cool completely; power sections hold high voltages, so leave work inside the chassis to a qualified technician.
- Note each position, then gently rock the old 6550 tubes straight out of their sockets.
- Fit the 6550-TK tubes with the pins or key aligned, pressing each fully home, and refit any retainers.
- Power up and let the amplifier warm up; have the bias checked by a qualified technician where the amplifier requires it, then check the sound at low volume.
Workflow 4: Studio backline
Studios keeping their 6550 amplifiers session-ready.
Connections
| Connect | To |
|---|---|
| 6550‑TK | 6550 sockets of the studio amplifier |
Setup
- Switch the amplifier off, unplug it from the mains and let the tubes cool completely; power sections hold high voltages, so leave work inside the chassis to a qualified technician.
- Note each position, then gently rock the old 6550 tubes straight out of their sockets.
- Fit the 6550-TK tubes with the pins or key aligned, pressing each fully home, and refit any retainers.
- Power up and let the amplifier warm up; have the bias checked by a qualified technician where the amplifier requires it, then check the sound at low volume.
Workflow 5: Live sound and touring spares
Backline techs carrying replacement power tubes.
Connections
| Connect | To |
|---|---|
| 6550‑TK | Spares case, then the 6550 sockets of the touring amplifier |
Setup
- Switch the amplifier off, unplug it from the mains and let the tubes cool completely; power sections hold high voltages, so leave work inside the chassis to a qualified technician.
- Note each position, then gently rock the old 6550 tubes straight out of their sockets.
- Fit the 6550-TK tubes with the pins or key aligned, pressing each fully home, and refit any retainers.
- Power up and let the amplifier warm up; have the bias checked by a qualified technician where the amplifier requires it, then check the sound at low volume.
Workflow 6: Rental inventory
Rental stores retubing amplifiers between bookings.
Connections
| Connect | To |
|---|---|
| 6550‑TK | 6550 sockets of the rental amplifier |
Setup
- Switch the amplifier off, unplug it from the mains and let the tubes cool completely; power sections hold high voltages, so leave work inside the chassis to a qualified technician.
- Note each position, then gently rock the old 6550 tubes straight out of their sockets.
- Fit the 6550-TK tubes with the pins or key aligned, pressing each fully home, and refit any retainers.
- Power up and let the amplifier warm up; have the bias checked by a qualified technician where the amplifier requires it, then check the sound at low volume.
