EBC81 (EBC81) 1959 or 1957?

Dear Friends

I try to create a new model of a CALYPSO MAMBO. Then  I noticed that one tube (the EBC81) could be invented in 1957, not in 1959 as is indicated in Rmorg, in this tube models's page.

The reason of this alert is  because in CALYPSO schematic diagram is written that this schematic was drawn in 1957.

I couldn't uplowd yet the schematic of this CALYPSO MAMBO because it was not accepted yet, but one can see the same tubes in CALYPSO schematic which was drawn also in 1957.


Also I've here one Mullard Radio Valve Manual printed in 1957 where I already can see this EBC81.

Best Regards

Mário

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Hello Mário,

 

by checking my documents I found the EBC81 in an original  Philips document from March1955.

In the French book "Histoire de la lampe de radio" the author quotes a French radio magazine from May 1956 that mentions the EBC81.

 

These documents are proof evidences that the EBC81 was already invented before 1957

Best Regards

Jacob

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