My Tube Collection, Welcome to share yours

The light was not good when I made this photo, but anyway.

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Here we have from left to right: Philips "Amperex" ECC88 (GA2/◿9G) with D-getter, Telefunken ECC88 (B9207306) and the one decided it's a Siemens ECC88 branded "Hewlett Packard" without any code. All are nice, Telefunken is spectacular. These 3 keep me busy for several days already.
 
The light was not good when I made this photo, but anyway.

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Here we have from left to right: Philips "Amperex" ECC88 (GA2/◿9G) with D-getter, Telefunken ECC88 (B9207306) and the one decided it's a Siemens ECC88 branded "Hewlett Packard" without any code. All are nice, Telefunken is spectacular. These 3 keep me busy for several days already.
Glad you like them, to my ear these are the best E88CC , nothing come close
 

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From reading around the internet it seems like there's four relavant RFT audio tube factories. I think I have 3 of them in ECC83.

VEB Werk für Fernmeldewesen Berlin-Oberschöneweide, Ostendstrasse 1-5, East Germany (= WF)
Muhlhausen, or VEB Röhrenwerk Mühlhausen, Thüringen, Eisenacher Strasse 40, East Germany (= M) (RWM)
Neuhaus, or VEB Röhrenwerk "Anna Seghers" Neuhaus am Rennweg, East Germany (= RWN) (Röhrenwerk Anna Seghers)
VEB Funkwerk Erfurt, East Germany (= W)

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I have all of them too. I am just not sure the labels correspond to all the different plants. As an employee of RFT told me when I had visited the former GDR in the late 90s, some work was sub-contracted to them from the Soviet "management" and these tubes shipped (where?) unlabelled. It is often that I wish I was more scholastic and better equipped with both better language skills and a capacity for going deeper into things when I was young (and obviously a tad foolish...). Despite the lack of a clearer historical perspective, these folded plate RFT tubes sound incredible in driver and cathode follower positions. Just lovely...:)
 
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Lots of people have the ability to label things just like you're talking about but I don't think there's any way to fake the construction or sound of a tube. Usually I prioritize construction, etching and labeling in that order when trying to determine what a tube is. A lot of this is before my time and I have language barriers just like anyone else. That's why I tell people I'm not 100% sure but I try to bring some evidence to support what I say.
I definitely agree with you that the folded plates sound very nice. Much better than Erfut!
 

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