[kolkoo]

Here's an early 50s Valvo I have, construction and getter looks slightly different, but I don't know how much they varied the construction. It has two holes on the plate.

There were also some made in Suresnes, France, as well as Italy apparently. Those labels look very similar to Fivre labels, so they could be Italian?

Here's the Valvo I have: https://i.ebayimg.com/images/g/yPIAAOSwdjRarrmw/s-l500.jpg

edit, I just saw that the seller is in Italy, my guess would be Philips, Italy.

Some info here on Philips Italy: https://www.radiomuseum.org/forum/an_overview_of_italian_vacuum_tube_manufacturers.html

Well once my quad gets here I'll let you guys know Also got a single Fivre and the getter is a bit different and has no getter post but is welded to some pointy stuff on almost on top of the mica.

 

[AuditoryCanvas]

Well once my quad gets here I'll let you guys know Also got a single Fivre and the getter is a bit different and has no getter post but is welded to some pointy stuff on almost on top of the mica.

I just re-edited my reply. Seems to be Philips Eindhoven.

I'm curious how the Fivre sounds, had my eye on some for a while.

 

[kolkoo]

Here's an early 50s Valvo I have, construction and getter looks slightly different, but I don't know how much they varied the construction. It has two holes on the plate.

There were also some made in Suresnes, France, as well as Italy apparently. Those labels look very similar to Fivre labels, so they could be Italian?

Here's the Valvo I have: https://i.ebayimg.com/images/g/yPIAAOSwdjRarrmw/s-l500.jpg

edit, apparently Philips, Eindhoven (T)

I'm still skeptical something about that code doesn't add up

Edit: yeah that Fivre quad is overpriced my single was like 40$ so been waiting for another single but they don't seem to come up very often.

 

[kolkoo]

The Tk1 TCD I mean sounds like an Eindhoven indeed

 

[kolkoo]

But TCD? C is the year here? It is weird

 

[AuditoryCanvas]

C would be right, no?

I think he left out the s on the end of 1950: http://www.jacmusic.com/nos/ECC81.htm

 

[Oskari]

I mean looks at this tube though https://www.ebay.com/itm/SUPERB-195...967399?hash=item3b1bf2cca7:g:SQcAAOSwroFbnFkH

This tube is actually Philips Venolanda... where most prototypes of Philips were done (like the 1955 + on plate E88CC PWs )

Surely you meant to say Eindhoven. Venolanda was the operation in Venezuela.

I think the factory code was reused; first Eindhoven, later Venezuela.

The 4, that is.

 

[kolkoo]

Surely you meant to say Eindhoven. Venolanda was the operation in Venezuela.

The 4, that is.

I did not mean to say Eindhoven. Unless you have some specific proof that 4 is Venolanda?
As for the E88CCs I'm talking about these http://usr.audioasylum.com/images/6/69157/dscf9715.jpg which predate the Eindhoven PWs and have the +=+ signs on the plate, they came from Venolanda apparently as they had such codes.

I guess what you are saying is possible and makes more sense, but why would they use 4 and 6 to indicate Eindhoven and why do the docs state that 4 is Venolanda? I mean anything is possible

Edit: We also have the Philips Copenhagen ECC81s with the straight triangle (not delta)B TkP codes

 

[Oskari]

The Tk1 TCD I mean sounds like an Eindhoven indeed

But TCD? C is the year here? It is weird

This code may be incorrect—or nonstandard.

 

[kolkoo]

This code may be incorrect—or nonstandard.

Or the C is a 6 that is not very visible

 

[Oskari]

I did not mean to say Eindhoven. Unless you have some specific proof that 4 is Venolanda?
As for the E88CCs I'm talking about these http://usr.audioasylum.com/images/6/69157/dscf9715.jpg which predate the Eindhoven PWs and have the +=+ signs on the plate, they came from Venolanda apparently as they had such codes.

I guess what you are saying is possible and makes more sense, but why would they use 4 and 6 to indicate Eindhoven and why do the docs state that 4 is Venolanda? I mean anything is possible

Eindhoven was the hometown of Philips with most of the R&D taking place there. There were several factory codes given to the different departments there. Many of these were later reused.

http://frank.pocnet.net/other/Philips/PhilipsCodeListAB-v10.pdf
http://frank.pocnet.net/other/Philips/PhilipsCodeList.pdf

 

[kolkoo]

Eindhoven was the hometown of Philips with most of the R&D taking place there. There were several factory codes given to the different departments there. Many of these were later reused.

Cool stuff! I had seen the first PDF but not the second one. Oskari tube history guru strikes again ^^

 

[TK16]

https://www.ebay.com/itm/NOS-Pair-Mullard-ECC81-12AT7-Bugle-Boy-Vacuum-Tubes-D-Getter-1957-3-DAY-SALE/263924302890?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
These suckers just came in, not the best match testing wise based on my testing. TK1 B7E codes. Only listened for a few minutes. Potential there. Needs a burn in. Put the 6201 PW back in and OMG. Holy Grail on steroids. 1 tube is only slightly micro other still is bit more micro. Not even thinking about returning them they are so good.

 

[AuditoryCanvas]

Eindhoven was the hometown of Philips with most of the R&D taking place there. There were several factory codes given to the different departments there. Many of these were later reused.

Thanks very much for the doc links.

 

[TK16]

https://www.ebay.com/itm/2-x-1950s-...rentrq:e9ddebf61650aa13f2ca3ac9fffff49c|iid:1
Anybody hear or know anything about these tubes. Never heard of Whyteleafe or seen that code.