[pyramid6]

I got some RCA and Zenith 6EW7 power tubes for my WA6. Does anyone know anything about the Zenith tubes? Are the Zenith tubes made by someone else? I haven't seen anyone mention Zenith tubes in any of the tube rolling threads. Both the RCA and Zenith are fatter than the GE's that came with the amp.

I'll post some impression after they burn in for a bit.

Thanks

Edit: Here are photos:

 

[musicmind]

AFAIK, Zenith tubes were made by Sylvania.

 

[sacd lover]

Quote:

Originally Posted by musicmind /img/forum/go_quote.gif AFAIK, Zenith tubes were made by Sylvania.

Zenith never made tubes. Zenith was a rebrander and the tubes could have been made by just about any US manufacturer that made 6EW7s.

 

[pyramid6]

Thanks, I was thinking that was the case. Any idea how to tell what they compare too? They sound pretty good so far.

 

[Gvvt]

There's some info on Zenith tubes here Vacuum Tubes for Amps - Tube Mfgr Codes. The manufacturer's code should identify the tube, assuming the code is there, or legible.

EDIT: It looks like the code might be the 343 running down the center of the tube in your picture. Oddly enough, that's the Zenith code, but supposedly applies to CRT tubes... (The numbers given in the discussion linked above seem to be wrong, actually: 337 is Westinghouse, not Zenith.) Commonly Seen EIA Codes

 

[sacd lover]

Quote:

Originally Posted by Gvvt /img/forum/go_quote.gif There's some info on Zenith tubes here Vacuum Tubes for Amps - Tube Mfgr Codes. The manufacturer's code should identify the tube, assuming the code is there, or legible. EDIT: It looks like the code might be the 343 running down the center of the tube in your picture. Oddly enough, that's the Zenith code, but supposedly applies to CRT tubes... (The numbers given in the discussion linked above seem to be wrong, actually: 337 is Westinghouse, not Zenith.) Commonly Seen EIA Codes

The codes may not tell you much of anything. Most rebranders added their code when they had the tube printed. If a Zenith branded tube has a Zenith code what does that tell you .... since we know Zenith didnt make tubes. Now if you find another manufacturers code on the tube .... bingo. However, you really need a good supply of the tube type you can look through to get some understanding of who made what.

 

[Gvvt]

sacd lover,

you're right, of course. Complete lapse of logic on my part. Sorry for going off half-cocked.