18W TMB Tube Amplifier | Complete Electronics Component Pack
SKU code: AP-18w
18W TMB Valve Amplifier Electronics Component Pack
Read Before Purchasing.
Important Product Information: This item is a Component Pack, NOT a Kit.
The 18W TMB pack contains a collection of individual parts to save you time when sourcing materials for a build. It does not include instructions, step-by-step assembly guides, or build support from Evatco. This product is intended strictly for experienced builders and technicians.
⚠️ DANGER — HIGH VOLTAGE RISK
Valve amplifiers operate at lethal voltages (often exceeding 350V–500V DC). These voltages can remain stored in components even when the amplifier is switched off and unplugged. If you do not have the proper technical knowledge, tools, and safety protocols to work with high-voltage electronics safely, please do not attempt to build or work on this project.
Build your own classic British-style 18W TMB valve amplifier with this comprehensive electronics component pack. Featuring the Treble, Middle and Bass (TMB) tone stack alongside the classic 18W Normal channel, this build delivers British crunch, dynamic touch response and vintage tone.
This pack contains the electronic and hardware components needed to assemble a complete 18W TMB chassis, from the transformers and valves down to the wire, screws and solder lugs. The full list, with quantities, is below.
There are a range of schematics and layouts on the internet. This pack is based on the Ceriatone version of the 18W TMB, which we feel is a great version. You can find that layout here. Please check every part against the schematic and layout you build from.
Kit Features & Highlights
- Dual Channel Circuit: Classic 18W Normal channel paired with a TMB (Treble, Middle, Bass) channel.
- Authentic Valve Tone: Powered by 2x EL84 power valves, 3x 12AX7 preamp valves and an EZ81 valve rectifier for classic vintage sag.
- Genuine Hammond Transformers: 290PAZ power transformer and 1750PA output transformer, made for the Marshall 18 Watt.
- Ready to Build On: Includes the 18W TMB custom chassis, an 18W turret board, ceramic valve sockets, Alpha pots, and every resistor and capacitor on the list below.
What's Included in the Box
Every item and quantity in the pack. Where an item is a pack (fuses, screws, solder lugs), the quantity is the number of packs.
| Item | Qty |
|---|---|
| Transformers | |
| Hammond 290PAZ Marshall 18 Watt Combo Power Transformer | 1 |
| Hammond 1750PA Marshall 18 Watt Combo Output Transformer (4, 8 & 16 Ω) | 1 |
| Valves / Tubes | |
| JJ Electronic 12AX7 / ECC83S / 7025 Preamp Valve | 3 |
| JJ EL84 Power Valves, Matched Pair | 1 pair |
| JJ Electronic 6CA4 / EZ81 Rectifier Valve | 1 |
| Chassis, Board & Valve Sockets | |
| 18W TMB Custom Chassis | 1 |
| 18W Turret Board | 1 |
| Turret Stand-Off Pack, 10mm | 1 |
| B9A 9-Pin Ceramic Valve Socket, suits 22mm hole | 3 |
| B9A 9-Pin Ceramic Valve Socket with 55mm Shield, suits 22mm hole | 3 |
| 60mm Spring-Type Valve Retainer | 3 |
| Tag Strip, 3-Way | 1 |
| Potentiometers | |
| Alpha 1MΩ Log (Audio) Potentiometer | 2 |
| Alpha 500kΩ Log (Audio) Potentiometer | 3 |
| Alpha 250kΩ Linear Potentiometer | 1 |
| Alpha 25kΩ Linear Potentiometer | 1 |
| Switches, Jacks & Power Entry | |
| Heavy Duty DPDT Toggle Switch, 10A 277V AC (Power & Standby) | 2 |
| Rotary Impedance Selector Switch | 1 |
| Cliff Mono Jack, Chrome Nut | 5 |
| IEC Mains Socket | 1 |
| 3AG Fuse Holder, fits 13mm hole | 1 |
| 1A Slow-Blow Fuse (5 pack) | 1 |
| Indicator Light, Red Square, 6V | 1 |
| Filter & Electrolytic Capacitors | |
| JJ Electronic 32+32µF 500V Dual Can Capacitor | 1 |
| 35mm Capacitor Clamp | 1 |
| Evatco 16µF 500V Axial Capacitor | 1 |
| Evatco 22µF 500V Axial Capacitor | 1 |
| Vishay 100µF 63V Axial Electrolytic Capacitor | 1 |
| Vishay 1µF 63V Capacitor | 2 |
| Signal & Tone Capacitors | |
| 0.0022µF (2.2nF) 630V | 1 |
| 0.0047µF (4.7nF) 630V | 2 |
| 0.01µF (10nF) 630V | 5 |
| 0.022µF (22nF) 630V | 1 |
| 0.047µF (47nF) 630V | 1 |
| 500pF 500V Silver Mica Capacitor | 1 |
| Evatco 0.01µF (10nF) 3kV Ceramic Capacitor | 1 |
| Resistors — 1 Watt Metal Oxide | |
| 100Ω | 1 |
| 820Ω | 4 |
| 8.2kΩ (8k2) | 2 |
| 22kΩ | 1 |
| 33kΩ | 1 |
| 56kΩ | 2 |
| 68kΩ | 2 |
| 100kΩ | 6 |
| 470kΩ | 5 |
| Resistors — Power | |
| 100Ω 2W Metal Oxide | 1 |
| 2.2kΩ (2k2) 2W Metal Oxide | 1 |
| 8.2kΩ (8k2) 2W Metal Oxide | 1 |
| 100kΩ 3W Metal Oxide | 1 |
| 130Ω 5W Cement Resistor | 1 |
| 1.5kΩ (1k5) 5W Cement Resistor | 1 |
| Resistors — 1 Watt Carbon Film | |
| 1MΩ | 2 |
| Diodes | |
| 1N4007 Diode | 2 |
| Wire | |
| Teflon (PTFE) Hook-Up Wire, Clear | 1 |
| Teflon (PTFE) Hook-Up Wire, Black | 1 |
| Teflon (PTFE) Hook-Up Wire, Blue | 1 |
| Teflon (PTFE) Hook-Up Wire, Brown | 1 |
| 18AWG Buss Wire | 1 |
| Screws & Solder Lugs | |
| M3 Screw Pack, 10mm | 2 |
| M4 Screw Pack | 2 |
| 3mm Locking Earth Solder Lugs (10 pack) | 1 |
| 4mm Locking Earth Solder Lugs (10 pack) | 1 |
Knobs are not included, so you can choose the style that suits your build. Browse our amplifier knobs range to find a set for your 7 controls.
Product Specifications
- Output Power: ~18 Watts RMS
- Preamp Valves: 3 x 12AX7 / ECC83
- Power Valves: 2 x EL84
- Rectifier Valve: 1 x EZ81 / 6CA4
- Channels: Channel 1 (Tone & Volume) / Channel 2 (TMB - Treble, Middle, Bass & Master Volume)
- Impedance Outputs: 4, 8, 16 Ohm switchable
| SKU | AP-18w |
| Brand | Evatco |
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