6A40 Amp Kit

40W, 4×10, 2×12, 1×15 or head. Complexity: 5


Cab Configuration * 

Cab Configuration

Line Voltage * 

Line Voltage

Cab Covering * 

Cab Covering

Grill Cloth * 

Grill Cloth

Control Panel * 

Control Panel

Handle * 


A La Carte

A La Carte

Two 6L6, 40W. Classic BF AB763 circuit, two channel, with vibrato and reverb.

If you would like this kit assembled for you by one of our techs, you can email your request HERE. for a build quote.


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Thank you for your interest in Weber Amplifier Kits. We would like for you to read the following information so you are aware of some of the issues involved with building an amp kit.

• We provide a layout and a schematic, but we do not include step by step assembly instructions.
• Troubleshooting advice can be found in the Kitbuilding section of the Forums
• Kits with cabinets ship as one complete shipment.
• Lead time for kits is at least 4 weeks and ebbs and flows with the world’s production/supply.
• All kits are shipped with signature required for delivery.

Please Read: The complexity of Weber kits ranges from very simple to extremely complex. We do not recommend anyone attempting to build any of our kits that are rated at 3 or higher in complexity unless you have the assistance of a qualified amp builder or electronics technician. Because of the sensitivities to wire placement, grounding schemes, and other parts related issues, troubleshooting the potential malfunctions and noises can be very frustrating without the experience and knowledge. All Weber amplifier kits have lethal voltages that are present even after power is removed. You must exercise extreme caution when working with high voltages. Before ordering any of these kits, you should look over the schematics and layouts provided for each kit to ensure there is enough information for you to feel comfortable building the kit. Click here for an explanation of complexity ratings.

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“Hey guys, these kits aren’t Lego™ sets. They require some thought, experience, and the correct tools. If you do not think you have the time, ability, nor tools to do this, maybe this isn’t for you right now. If you still want to build one of our kits, but are a little uncertain, please enlist the aid of a qualified tech.” — Ted Weber.

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2 reviews for 6A40 Amp Kit

  1. Paul (verified owner)

    1st Weber kit build and am very happy. Perfect for home use and with careful handling gig worthy. Build note: You must pay a lot of attention to heater wiring and ground layout if you want this amp to be quiet. Most of the effort in this build was getting those areas right. Read about grounding from Doug Hoffman at http://www.hoffmanamps.com and http://www.valvewizard.com and look at any youtube video you can about heater wiring. You don’t do these things correctly I think you will have an unsatisfactory result. I used 18 gage solid core and tight twists for heaters. and made sure to keep heater wiring separated and tucked into leading edge of chassis and at 90 degrees to signal wiring. It is labor intensive and you need to pay attention to the polarity so make the insulation to keep the hookup consistent tube-to-tube. Grounding I did not use Weber Ground plane. I used a ground buss bar and grouped into three ground points for the whole amp. Amp is very quiet. The other things I did were to buy 20 extra 0.1mf caps and 20 extra 220kohm resisters that I carefully matched to get two of each for the phase inverter/driver. Trust me it takes that many to get two that match to the third digit. The spread was more than I thought it would be. Full tolerance range on both. I consulted Dan Torrres old book (pre-internet) and added a "Sizzle cap" 0.047 mf to the driver and I added a diode to the "C" power supply for the input tubes for a little extra rectification to make it a touch cleaner. I used 3 watt 470kohm metal oxide screen resistors and mounted them a little away from the power tube socket so they would run a little cooler. Speakers are great. The quality of the hardware is pretty basic. The capacitors are film caps similar to Mallorys, electrolytic are generics, the silver micas are generics, the resistors are all metal film or metal oxide and I think that contributes to the low noise. Cabinet, grill cloth and Tolex are fine for me. Sounds great and I think it will last.

  2. Guy (verified owner)

    This was my third weber build and it turned out great. Transformers sound surprisingly good. Noise floor is really low. Power tubes were a bit mismatched but still sounded great before I upgraded. I highly recommend this kit.

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