My understanding is that sometimes (not always)there is a difference in military tubes. If the original use is to use them in Mig fighters or something that is understandable. Sometime it is just quality control too. Generalizations are probably hard to make in this area. I'd be interested in hearing opinions on this point.
There are some good crossreferences such as the bottom of this page. I have a more complete site but can't find it at the monment. I'll post it if I find it.
http://www.hndme.com/storetroubleshootingtips.html
Here is list that might help newbies too. The first few explain tube numbering which is a bit of a mystery when you start out. The second set are online sources for tube data. The first three (Duncan, Frank's and Triode Electronics) will usually have the info needed.
P.S. Hey Fletch. Nice posts for newbies but you sure use a lot of commas when you write.
Tube Numbering explained:
*) Åkes Tube Numbering: http://w1.871.telia.com/~u87127076/tabeller/index.htm
*) Tube Numbering Systems (Franks site) http://home.wxs.nl/~frank.philipse/frank/tubnum.html
*) Philip, Valvo & Mullard Valve Coding: http://www.cs.helsinki.fi/u/oheinone/valves/pvm-coding.html
*) Tube Numbering (MachMats Site): http://www.machmat.com/info/index.htm
*) Russian encoding system: http://www.arrakis.es/~igapop/russianotes.htm
*) Coding systems: http://www.arrakis.es/~igapop/referenc.htm
*) Phillips factory and tube codes: http://www.triodeel.com/images/philipstubecodes.pdf [Note that all Philips subsidiary companies (Mullard, Valvo, etc) and all factories that made tubes under Philips license used these codes (Ei, Toshiba, Siemens, etc) so it's not limited to European Philips tubes.]
Tube data:
1) Duncan Amps: http://www.duncanamps.co.uk/cgi-bin/tdsl3.exe/searchform
2) Franks Tube Data Page http://frank.nostalgiaair.org/index.html
3) Triode Electronics Tube Data Sheets: www.triodeel.com/tubedata.htm
4) Radau5s tube data sheets: http://www.radau5.ch/valves.html
5) Tubebuilder Tube Data: http://www.tubebuilder.com/tubedata.html
6) Vacuum Tube Valley: http://www.vacuumtube.com/FAQ.htm.
7) Svetlana, Tube Dictionary: http://www.svetlana.com/docs/dictionary.html
8) Audiomatica, Tube Directory: http://www.mclink.it/com/audiomatica/tubes/home.htm
9) National Valve Museums list of Equivalents: http://www.valve-museum.org/
10) 4Tubes. http://www.4tubes.com
11) Tube Collectors Association: http://www.tubecollectors.org/
12) Mach-Mat: http://www.machmat.com/sheet/index.htm
13) Kytelabs Tube infobase: http://www.qsl.net/dl7avf/roehren/roehren.html#TOC
14) An Intro to NOS tubes: http://www.soundstage.com/tubeor/tube.htm
15) Western Electric Archives: http://www.westernelectric.com/spec_sheets/we_spec_sheets.htm
16) Tom Jennings: http://www.wps.com/archives/tube-datasheets/index.html
17) Åkes TubeData: http://www.tubedata.com/
18) Magic Sound of Tubes (NOS): great pictures of NOS tubes. http://spazioinwind.libero.it/themagicsound/index.htm
19) Bills (NJ7P) Database: http://hereford.ampr.org/cgi-bin/tube?index=1
I remain,
There are some good crossreferences such as the bottom of this page. I have a more complete site but can't find it at the monment. I'll post it if I find it.
http://www.hndme.com/storetroubleshootingtips.html
Here is list that might help newbies too. The first few explain tube numbering which is a bit of a mystery when you start out. The second set are online sources for tube data. The first three (Duncan, Frank's and Triode Electronics) will usually have the info needed.
P.S. Hey Fletch. Nice posts for newbies but you sure use a lot of commas when you write.
Tube Numbering explained:
*) Åkes Tube Numbering: http://w1.871.telia.com/~u87127076/tabeller/index.htm
*) Tube Numbering Systems (Franks site) http://home.wxs.nl/~frank.philipse/frank/tubnum.html
*) Philip, Valvo & Mullard Valve Coding: http://www.cs.helsinki.fi/u/oheinone/valves/pvm-coding.html
*) Tube Numbering (MachMats Site): http://www.machmat.com/info/index.htm
*) Russian encoding system: http://www.arrakis.es/~igapop/russianotes.htm
*) Coding systems: http://www.arrakis.es/~igapop/referenc.htm
*) Phillips factory and tube codes: http://www.triodeel.com/images/philipstubecodes.pdf [Note that all Philips subsidiary companies (Mullard, Valvo, etc) and all factories that made tubes under Philips license used these codes (Ei, Toshiba, Siemens, etc) so it's not limited to European Philips tubes.]
Tube data:
1) Duncan Amps: http://www.duncanamps.co.uk/cgi-bin/tdsl3.exe/searchform
2) Franks Tube Data Page http://frank.nostalgiaair.org/index.html
3) Triode Electronics Tube Data Sheets: www.triodeel.com/tubedata.htm
4) Radau5s tube data sheets: http://www.radau5.ch/valves.html
5) Tubebuilder Tube Data: http://www.tubebuilder.com/tubedata.html
6) Vacuum Tube Valley: http://www.vacuumtube.com/FAQ.htm.
7) Svetlana, Tube Dictionary: http://www.svetlana.com/docs/dictionary.html
8) Audiomatica, Tube Directory: http://www.mclink.it/com/audiomatica/tubes/home.htm
9) National Valve Museums list of Equivalents: http://www.valve-museum.org/
10) 4Tubes. http://www.4tubes.com
11) Tube Collectors Association: http://www.tubecollectors.org/
12) Mach-Mat: http://www.machmat.com/sheet/index.htm
13) Kytelabs Tube infobase: http://www.qsl.net/dl7avf/roehren/roehren.html#TOC
14) An Intro to NOS tubes: http://www.soundstage.com/tubeor/tube.htm
15) Western Electric Archives: http://www.westernelectric.com/spec_sheets/we_spec_sheets.htm
16) Tom Jennings: http://www.wps.com/archives/tube-datasheets/index.html
17) Åkes TubeData: http://www.tubedata.com/
18) Magic Sound of Tubes (NOS): great pictures of NOS tubes. http://spazioinwind.libero.it/themagicsound/index.htm
19) Bills (NJ7P) Database: http://hereford.ampr.org/cgi-bin/tube?index=1
I remain,