Valve Heater Glow

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Valve Heater Glow

Everyone that loves the look of Glowing shiny valves sitting on a high end Hi Fi amp or visible behind a Guitar Valve amp Head will have mixed reactions regarding the new Generation Preamp tubes being produced from the Russian Factories. To the Dismay of the "we love the valve glow" fans they have modified most of the latest generation designs to improve Emissions efficiency which results in an all round better performing tube. The cost of having better sounding tubes, unfortunately comes at the cost of a vastly reduced heater glow visible from outside of the tube. The Heaters are still merrily doing their job within the inner confines of the valve structure but the tighter plate surrounds has now made the glow almost invisible in most of the later offerings.

Manufacturers affected by not having a big heater glow are, Tungsol, Sovtek and Electro Harmonix preamp tubes.

So next time you invest in a brand new shiny pre amp tube for your beloved gear please note that a lack of glow is not indicative of a tube that is not working correctly but actually is likely to be a new generation valve.