[adrianc]

Because the materials and labour are getting more expensive,you won't find later made valves with pins applied with silver,good example like Leak amplifiers using less expensive transformers.washing machine on the diet.

[adrianc]

so why telefunken stopped producing those type ecc82 shortly after.I think telefunken engineers maybe think those tubes sounds not good   just kidding:lol:

I suspect these are prototype valves and not operated  within it's specification,well just guess 

[adrianc]

Love these labels

[rodama]

Because the materials and labour are getting more expensive,you won't find later made valves with pins applied with silver,good example like Leak amplifiers using less expensive transformers.washing machine on the diet.

Right, just like phillips, they step down quality through the years degrading tubes by continuous , first delete welded plates from Copenhagen (1954), then foil or special gettering (1958), then pinched waist in Hamburg (1959) then copper rods and intruduce cheaper short plates (1960) then triple mica out through the sixties....and finally at the early 70's no special shield construction in the ecc88 family....

I suspect these are prototype valves and not operated  within it's specification,well just guess 

I think these  ecc82 are just early made, they are gems, think that these were the first ecc82 in the whole european continent.
At that momment only us brands were made it for very few years....my guess it's that telefunken starts to produce these early type of ecc8x in very small quantityes to cover the demmands of us troops on germany, keep in mind that we're talking about Germany in 1948-50... and how many german (or european) radios or machinery of that era uses a ecc8x?? but this is only my guess

[shoot]

think that these were the first ecc82 in the whole european continent.
At that momment only us brands were made it for very few years....my guess it's that telefunken starts to produce these early type of ecc8x in very small quantityes to cover the demmands of us troops on germany, keep in mind that we're talking about Germany in 1948-50... and how many german (or european) radios or machinery of that era uses a ecc8x?? but this is only my guess

don't agree with it,I think brimar maybe produced the first ecc82 in europe.I saw brimar 12au7 made in 1950.
and also there's 1951's ecc83 ecc81 made by philips.I have 1951 disc getter ecc81 made by philips and also saw JAN 1951's ecc83.but never saw early than 1952's telefunken ecc8x.

this is not mine,picture from web

[adrianc]

I think maybe 4 version.
The first version is the earlist which produced in 1952,No edges on mica,plate had one hole and one middle bar,black mercury,straight D getter.(the first one on the left)
Second version No edges on mica,plate had one hole and one middle bar,silver mercury,straight D getter.
third version Four edges on top mica,plate had one hole and one middle bar,straight D getter.
fourth version Four edges on top mica,plate had two holes and two bars,wing D getter.

Are you refer to these Black mercury

 

[rodama]

don't agree with it,I think brimar maybe produced the first ecc82 in europe.I saw brimar 12au7 made in 1950.
and also there's 1951's ecc83 ecc81 made by philips.I have 1951 disc getter ecc81 made by philips and also saw JAN 1951's ecc83.but never saw early than 1952's telefunken ecc8x.

I was talking about ecc82 only, by mistake I wrote ecc8x instead of ecc82  I know that philips made ecc81 in 1951 or maybe early, and in the case of Brimar, I do not considere UK as continental Europe, it's true you'll find UK made tubes with german labels but the earliest one I've seen was from 54, again maybe there's earlier ones but didn't see or read of it.
These telefunken at left (not mine) was made november 1951, I've seen four or five made in 1950 and it's supossed to be made in 1949....but only supposed

[adrianc]

Are these John's photo??

[rodama]

I found on the net these other relabeled with negative telefunken logo like my el84 rft, looks like Tesla Czekoslovakia

[rodama]

Are these John's photo??

I don't know, I foud it time ago on a thread and save the pic

[rodama]

What about this??? code  +A k6B = Philips Sittad january 1951 ecc82???

[adrianc]

This

[rodama]

Yours is Copenhagen july 1953 and mine should have the factory and month simbols reversal positioned, I don't think it can be a Sittrad january 1951 but Coppenhagen december 1953

[rodama]

Unusual ECC81 with thick pins and ceramic base,some said these are prototype made by Telefunken.

These were made september 51....museum tubes!! Can I ask you how did you get it?

[adrianc]

These were made september 51....museum tubes!! Can I ask you how did you get it?

It was a long time ago a valve dealer rang me and send me a fax of the valves and I just send him a cheque straight away, expensive thought,I have three of them,try to find the other one.

[rodama]

It was a long time ago a valve dealer rang me and send me a fax of the valves and I just send him a cheque straight away, expensive thought,I have three of them,try to find the other one.

These are the earliest tele ecc81 I've see and with perfect prints, money well spent imo

[shoot]

SEP.1951 . philips disc getter welded plates ecc81

[rodama]

Another museum piece here Shoot 

[shoot]

Another museum piece here Shoot 

no, this is not the earlist philips ecc81

[adrianc]

Very old Brimar 12ax7 Black plate