[TLO]

I found Bill’s stash…

Is that a 6 or 7 pins? Do you have a data sheet for that?

 

[FLTWS]

How about an adapter so it can be used in a variety of applications.

 

[bcowen]

How about an adapter so it can be used in a variety of applications.

LOL! I'd bet @Deyan could make one, but the shipping cost might be prohibitive...

 

[TLO]

I found Bill’s stash…

Anyway, I think it has lost its vacuum....lol

 

[jonathan c]

I found Bill’s stash…

Imagine, hiding all those Soviet Fotons in America’s heartland…

 

[Renexx]

I just bought a used pair of claimed "real Sylvania 6sn7 chrome tops made in 1940s" in a music store here in Germany.

This was the advertised picture.
He had a bulk of NIB but these were sold out so I did go for a used pair. But since they say GTB on top of the tube I'm in doubt it's the real deal.

They have Angeled T plates, came with removed print in mint condition.
They sound very warm...much warmer than a pair of other Sylvania GTBs that I have. But that's just a first impression.

I never found a picture of real Sylvania chrome doms online. Do you guys know if this is the real deal or did I get scammed? Do you guys have pictures of real Sylvania chrome domes and what I have to look out for ?

Here pictures of the tubes I received.

 

[Ripper2860]

Nice snag on those tubes. GTBs were introduced in 1954, I believe. They definitely did not exist in the '40s. I do not recall ever seeing angled t-plates on 40's vintage Sylvanias, either. These are also not the type and years referred to as "chrome domes" by collectors. Chrome domes were early 50s GTAs and the chrome flashing extended farther down covering the majority of the glass envelope. These are nice tubes none-the-less, but are not 40's vintage or those typically referred to as Chrome Domes.

 

[Renexx]

Well it was not my intention to buy a Sylvania GTB. I thought there is something special about these chrome tops and that seller seemed to be a serious guy.

Are these chrome domes?
https://www.ebay.de/itm/Sylvania-6s...2349624.m46890.l49286&mkrid=711-127632-2357-0
Or
https://www.ebay.de/itm/Zwei-NEU-Sy...2349624.m46890.l49286&mkrid=711-127632-2357-0

 

[Ripper2860]

I'm sorry you did not get what you expected. The two links both look like the real-deal 'Chrome Dome' GTAs to me. The right level of flashing. The right construction. The right year codes. The Zenith are actually mfg by Sylvania and there are even other mfgs that have rebranded them (Motorola, etc.). The trick is to look for the construction and the mfg code of 312.

Bullz is a well known and reputable reseller and he describes his accurately. The other vendor says they have Bad Boy plates, which is not entirely accurate, but it seems many call anything with 3-hole plates Bad Boys.

BTW - legit Chrome Domes are very nice sounding tubes, IMHO.

 

[jonathan c]

I'm sorry you did not get what you expected. The two links both look like the real-deal 'Chrome Dome' GTAs to me. The right level if flashing. The right construction. The right year codes. The Zenith are actually mfg by Sylvania and there are even other mfgs that have rebranded them (Motorola, etc.). The trick is to look for the construction and the mfg code of 312.

Bullz is a well known and reputable reseller and he describes his accurately. The other vendor says they have Bad Boy plates, which is not entirely accurate, but it seems many call anything with 3-hole plates Bad Boys.

BTW - legit Chrome Domes are very nice sounding tubes, IMHO.

I have purchased a number of 6SN7 type tubes from Bullz and heartily recommend him for the quality of the tubes and of his communication.

 

[Renexx]

I bought from both of them before ...both are nice guys.

I guess the chrome domes need to have parallel T plates like a sylvania 6sn7w?

The mfg code is the production code I guess ? What does 312 mean ?

The tubes in the second link show a different code.

 

[Ripper2860]

312 is Sylvania's MFG code. If you see a tube with 312 on the base, it's mfg by Sylvania and rebranded. Google 'vacuum tube EIA codes' and you'll find reference docs detailing mfg codes for most mfgs.

Most MFGs don't use the mfg code on their mfged and labeled tubes. The 339 in the Sylvania branded tube is the date if mfg - 39th week of 1953. The Zenith has 2 sets of codes - 312 denoting it is made by Sylvania and then the date code 326 - 26th week of 1953.

Yes. Chrome Dome plate construction is similar to the W's but W's have a copper support rod that runs top to bottom between the plates.

 

[bcowen]

312 is Sylvania's MFG code. If you see a tube with 312 on the base, it's mfg by Sylvania and rebranded. Google 'vacuum tube EIA codes' and you'll find reference docs detailing mfg codes for most mfgs.

Yes. Plate Chrome Dome stev construction is like the W's but W's have a copper support rod the run top to bottom between the plates.

Um, do you have an English translation for that?

 

[Ripper2860]

I corrected before you posted. I set the trap and you came galloping right in.

 

[jonathan c]

I corrected before you posted. I set the trap and you came galloping right in.

Trapper2860……