Electro Harmonix 6550 matched quad

€129.95
Out of stock

Electro-Harmonix 6550 matched quad
Electro-Harmonix 6550EH de beaming powertetrode for the tough loads.
Set of four.

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More Information
Tube type 6550
Manufacturer/Brand Electro-Harmonix
Production New
Tube kind Powertube
Construction Beaming Tetrode
Pin Layout Octal 8 pins
Country of Manufacture Russia

Electro-Harmonix 6550 matched quad
The 6550 powertetrode was originally developed by Tung-Sol in 1955 as a heavier power tube (100 Watts in complementary setup) than the EL34, 6L6 and 6CA7. The English counterpart of the 6550 came on the market a year later as the KT88.

Electro-Harmonix
Electro-Harmonix is a New York based company that has gained notoriety through guitar effect pedals. Started in 1968 by an audio technician and an ex employee of IBM Mike Matthews, who is also a Rhytm & Blues pianist. In the nineties, Electro-Harmonix was taken over by the New Sensor company, which is also located in New York. New Sensor has its own vacuum tube plant in Saratov Russia where it has its tubes made under strict supervision from the USA. Now that Electro-Harmonix has 50 years of experience within the music world, we at TubeDirect are convinced we have chosen a reliable partner for the supply of new tubes.

Besides the Electro-Harmonix 6550 we also sell the 6550 from Tung-Sol our premium version of the 6550.

Matched tubes
This set of tubes is matched. This means that the measured values of the tubes fall within the same range and thus perform equally. This is important for two reasons:
1. To obtain the same gain factor per tube and
2. For the same amount of quiescent current per tube.
The first requirement speaks for itself and the second requirement prevents the one tube where a higher quiescent current or bias is needed to make it work in the linear region will also be worn out earlier. Both new tubes and our NOS tubes can be ordered as matched versions.