6550 Matched Quad Power Valves (4 x Tubes)

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Looking for guitar amplifier valves or tubes? Compare Prices, suppliers and special offers to buy 6550 Matched Quad Power Valves (4 x Tubes). By accessing different online stores it is possible to see variations in buying prices and any possible savings that are on offer. Just click on the buy button on the right of the list and place your order. The web site has many valves to repair guitar amps to consider including matched guitar amp valve sets and complete guitar amplifier revalve kits.

Matched Amplifier Valves Explained

Why change the 6550 Matched Quad Power Valves (4 x Tubes) guitar amplifier valves within your guitar amplifier? Most Valve Guitar Amplifiers, especially push-pull designs, require matched output tubes. These can be in a matched pair of guitar amp valves (x 2), a matched quad of guitar amp valves (x 4) or a matched sextet of guitar amp valves (x 6). This will depend on the guitar amplifier circuit design and the output of the amplifier.  Matched means someone has tested and chosen the valves with similar characteristics to make them into a set. The general rule being more valves more power. In a push-pull guitar amplifier design one valve is pushing the speaker cone and one is pulling it. As the sound generated by the speaker cabinet is reliant on a clean signal it is important that the valves push and pull in equal measure. Read our guitar amplifier technical pages on the design of a Push Pull valve guitar amplifier and also a Single Ended valve guitar amplifier to understand how the technology works.

Buy Guitar Amplifier Matched Valve Sets

Buy Single Guitar Amplifier Valves

Also Consider these Full Replacement Valve Sets

Why Buy Matched Guitar Amp Valve sets?

It is your choice to buy single guitar amp valves and insert them into the existing valve guitar amplifier circuit or to buy 6550 Matched Quad Power Valves (4 x Tubes). However buying single valves can end up costing you more in the long run. Some guitar amplifier circuits need matched valves to work correctly. If unmatched valves are used in the guitar amplifier it is highly likely that the output sound will be degraded but most likely using the amplifier like this will lead to expensive damage to other parts of the circuit. When the guitar amp is idle, both valves will draw a small amount of current. If both valves are matched and drawing the same current, and have the same amount of gain, they will do a good job of cancelling any mains hum and other noise inside the guitar amplifier circuit. If the are not balanced (or matched) more hum will be present in the speaker. Also, it is likely that there will be a mismatch in the current draw, resulting in one valve getting hotter than the other valves in the amplifier. This may be severe enough to cause the valve to glow red which will reduce the life of the valve and overall reliability. Buying matched valves will ensure the valves have been individually tested for the same bias current under identical conditions of plate voltage and grid bias voltage.

Tips on Changing Amplifier Valves

Once you have changed the 6550 Matched Quad Power Valves (4 x Tubes) valves in your amplifier make a note of the date that you did the work. This can be done by adding a sticker on to the back of the guitar amplifier. This will make it easy for you to review how long they have been in the guitar amp and allow you to decide when is best to change them again in the future. Guitar amp valves (or tubes) will operate under normal working conditions for around 1000 hours, after this they may start to degrade however this will be gradual and maybe not noticed at first. Distortion and hum, or noise, are typically associated with faulty valves. Read our Guitar Amplifier Technical Pages and our tips for Valve Guitar Amplifier Maintenance and Changing Guitar Amplifier Valves.

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