Got hold of a Hoges rebrand ECC82 that I can't identify. Doesn't look like the ones I've got (Siemens, Telefunken, Philips, Valvo) and a quick net search didn't yield any results.
Short plate, only two plate ribs, one rectangular hole on each side of the plates. Possibly one or two seams on the top of the glass. No date codes. The number 13 is molded between pin 1 and 9 and - very strangely - there is a green print on the inside of the same spot that appears to read "BD-", handwritten. Any sleuths out there?
Short plate, only two plate ribs, one rectangular hole on each side of the plates. Possibly one or two seams on the top of the glass. No date codes. The number 13 is molded between pin 1 and 9 and - very strangely - there is a green print on the inside of the same spot that appears to read "BD-", handwritten. Any sleuths out there?
Not likely an east-block tube. East-block tube pins are usually quite red (no pun intended, but feel free to make your own) where they are encased in glass at the base of the tube.
Seem like RFT, East-German so from the DDR. The pins are also quite red in the glass.
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Check the plates and the top mica of the second photo and see how they compare to RFT, I haven't found a resembling pic but would gladly accept one.
Are there two mica sheets on the top level? t looks like it is a triple mica tube? In which case it is likely to be a 'special' and not the run of the mill examples.
Two sheets, and it seems most ECC82s have this in one form or another - the upper one like a spring to the heater/cathode (see my initial photos #3 & 4).
Another pic. Two glass seems at the top, hardly visible. The upper one with a smoke stain. But also a slight glass protrudance on the lower left side. Still I think my initial description of the inner metal structure (words and pictures) are crucial to the identification of the tube. Anyone challenged?
If it's not just the photo and the getter halo has indented curve as its cross-section, that is an excellent clue - I can tell you what it is not.
That there is no etched code is also somewhat tell-tale, but of what, I'm not sure.
That there is no etched code is also somewhat tell-tale, but of what, I'm not sure.
By the way, Hoges has an interesting tradition from hundred years ago.
Hoges, Hochohm Gesellschaft mbH, Feurigstr. 54, Berlin-Schöneberg. Herstellung(?) und Vertrieb von Röhren, sowie Meßgeräten und passiven Bauelementen, besonders Widerständen.
Hoges, Hochohm Gesellschaft mbH, Feurigstr. 54, Berlin-Schöneberg. Herstellung(?) und Vertrieb von Röhren, sowie Meßgeräten und passiven Bauelementen, besonders Widerständen.
Quick English translation: "High-Ohm Company Ltd., manufacturer (?) and sales of tubes, measurement apparatus and passive components, especially resistors." So even if they didn't produce tubes of their own they seemed to have the skill to judge the quality of the components they presented to the market. The ECC82 was of course of late production in the company's history.
I searched the net again for the suggestions in the post above but found no identical resemblance to Brimar. However, one copy of Hitachi ECC82 looks exactly like the Hoges ECC82, both the construction of the upper mica and the anodes. From what I understand Japan exported quite a lot of tubes to the rest of the world in the 1960s and 1970s, offering competitive prices.
Thanks to JacobLTA for his effort and sharp eyes!
Thanks to JacobLTA for his effort and sharp eyes!