Ultrone EH90 indirectly heated...

Ultrone EH90 indirectly heated heptode frequency changer

The EH90 is an indirectly heated heptode frequency changer. In the early 1960's Mullard designed for television service in dual-standard sets, the EH90 as an FM demodulator for 6 MHz inter-carrier sound. There is a paragraph on the EH90 in the 'Mullard Outlook' in an article entitled 'New Mullard Television Valves'. EH90 - Sound Discriminator. Adoption of the 625-line standard is to include the use of FM transmissions, and the latest dual-standard receivers are equipped to accommodate these transmissions. The heptode, type EH90, is being used for FM detection in many of these new sets, where it operates as a locked-oscillator discriminator. The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 46 mm tall.

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Ultron
TUBES-1-4-9
9 Items

Ultron was a German distributor of valves and electronic components.

They sourced their items from across the world and brand labeled them

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