The EL34 Power Valve for Guitar Amplifier (alternative 6CA7) was introduced in 1949 by Philips, the parent company of Mullard, however it is no longer made by them. The EL34 Power Valve for Guitar Amplifier is a power pentode vacuum tube mainly found in the final output stages of audio amplifier circuits. It has an international octal base (indicated by the ‘3’ in the part number) and was designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. The American tube designation number for this valve is 6CA7, so that can be used as an alternative.
You can buy the EL34 Power Valve for Guitar Amplifier below however it is most likely you will need to buy a EL34 matched pair or EL34 matched quad if you have a high powered valve amplifier. Review the owner manual if you are unsure.
Buy the EL34 (6CA7) Power Valve for Guitar Amplifier
Buy Matched EL34 Valve Sets
More About the EL34 Power Valve for Guitar Amplifier (Alt 6CA7)
In common with all ‘E’ prefix tubes, using the Mullard-Philips tube designation, the EL34 (6CA7) Power Valve for Guitar Amplifier has a heater voltage of 6.3V. Typical guitar amplifier designs using these valves use either a matched pair (two valves or a matched quad (4 valves). A matched pair amplifier would have an output power of around 50W and a matched quad would have 100w. Current manufacturers of the EL34 Amplifier Valve include – Svetlana (Russia), JJ Electronic (Slovakia), Shuguang (China) and Reflector (Russia making Sovtek, Electro-Harmonix, Tung-Sol and some other brands). Each manufacturers part will give different results when used within a guitar amplifier. The valve or tube used can shape the tone and overall performance of the amplifier.
Some firms make a related tube called the E34L which is rated to require a higher grid bias voltage, but which may be interchangeable in some equipment (Check your amplifier manufacturers instructions).
Popular Amplifiers using the EL34 Power Valve
The EL34 (6CA7) Power Valve for Guitar Amplifier can be found in a large number of valve guitar amplifiers from various manufacturers. Here are a selection of the best known makes Marshall, Orange and Laney.
More Guitar Amplifier Valve Links
- 12AT7 (ECC81) Guitar Amplifier Valve (Tube)
- 12AU7 (ECC82) Guitar Amplifier Valve (Tube)
- 12AX7 (ECC83) Guitar Amplifier Valves (Replacement Amp Tubes)
- 12BH7 Guitar Amplifier Valve (Tube)
- 5751 Guitar Pre-Amplifier Valve (Tube)
- 5AR4 (GZ34) Rectifier Valve for Guitar Amplifier
- 6550 Power Valve for Guitar Amplifier (Alt KT88)
- 6L6 Guitar Amplifier Power Valve (Alt 5881 / KT66)
- 6V6-GT Power Valve for Guitar Amplifier (Tube)
- EL84 Power Valve for Guitar Amplifier (Alt 6BQ5)
- Buy Guitar Amp Valves Matched Sets
- Matched sets of pre-amplifier and power output valves to ensure the maximum performance from your amplifier.
- Buy Full Guitar Amp Re-Valve Kits
- The best way to get the best from you guitar amplifier. By changing all of the valves as a complete set maximum performance from the amplifier can be assured. Changing individual valves can be a false economy as the one weak link in the chain will affect the overall performance.
- Look Up Your Guitar Amplifier
- We have kits available for most guitar amplifiers. Use the link above or the SEARCH feature to look up your amplifier.
Is your Guitar Amplifier not performing like it did when new? Has the output sound begun to degrade and break up? Are you experiencing additional noise and distortion? If yes, then it is time to consider replacing some or all of the valves in your guitar amplifier. Guitar amplifier valves (or tubes as they are known in the USA) are robust and will work for many hours. Performance will be affected by mistreating them or allowing them to overheat. Generally the performance of vacuum tubes starts to degrades with the amount of time they are used and up to 1000 hours is typically the optimum life of a valve or tube. If the performance of your amplifier is failing then it is likely that some or all of the valves need replacement.
When replacing guitar amplifier valves it is best to use matched pairs as this will ensure the valves last as long as possible with the best sound quality. We have a full range of replacement guitar amplifier valves and matched sets available for the most popular amplifier types – see the links above. Read our Guide to Replacing Guitar Amplifier Valves.