So, now that the cat is most definitely out of the bag with the RFT ECC81 Folded Plate Foil Disc Getter, I feel it's time to share a little more info about this tube.
Over the years this tube has evolved in construction and they also vary slightly in sound. The earlier they were made, the warmer and more bass and mid focused they sound. I have some from 54' all the way to the late 60's. Basically, this tube started out with the labeling of Funwerk Erfurt and several versions latter they started having the RFT logo with the crossed swords. As far as construction, the differences in the shape of the glass bottle is the most notable change, followed by the getter and getter support. The earliest version (54') has the most rounded top on the glass bottle, and a single getter support rod with a perfectly round shaped foil disc getter, and as you get latter in production the top of the glass bottle becomes more square and the getter post becomes a double, and the foil disc getter becomes more oval with a crease in it.
Here is a pic that shows the evolution of the glass bottle with the Funwerk Erfurt ECC81 otherwise known as RFT.
Left to right - 54', 57', 58', and early 60's
Over the years this tube has evolved in construction and they also vary slightly in sound. The earlier they were made, the warmer and more bass and mid focused they sound. I have some from 54' all the way to the late 60's. Basically, this tube started out with the labeling of Funwerk Erfurt and several versions latter they started having the RFT logo with the crossed swords. As far as construction, the differences in the shape of the glass bottle is the most notable change, followed by the getter and getter support. The earliest version (54') has the most rounded top on the glass bottle, and a single getter support rod with a perfectly round shaped foil disc getter, and as you get latter in production the top of the glass bottle becomes more square and the getter post becomes a double, and the foil disc getter becomes more oval with a crease in it.
Here is a pic that shows the evolution of the glass bottle with the Funwerk Erfurt ECC81 otherwise known as RFT.
Left to right - 54', 57', 58', and early 60's
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