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Post subject: Tidbit on tube designations -special apps and commercial use
Posted: Sun Sep 23, 2012 11:53 pm
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HTH in that constant search for spares and potential "rolls." :D

http://en.wikipedia.org/wiki/Marconi-Os ... g_tubes.29

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Poop on the "CV" labeled valves:

http://www.tubecollector.org/cv-valves.htm

European "M" prefix. These were specialized tubes to meet Euro military standards. The Mullard M8162 considered one of the best 12AT7 types --- along with the German made Valvo and S&H E81CC or the US made 6201.

" There are quite a number of these systems from different geographical realms, such as those used on devices from contemporary Russian and Chinese production. Other compound numbering systems were used to mark higher-reliability types used in industrial or commercial applications. Computers and telecommunication equipment also required valves (tubes) of greater quality and reliability than for domestic and consumer equipment. "

Examples
M8162 = B309 = 12AT7 = ECC81
M8083 = Z77 = 6AM6 = EF91

______________

Some Russian designations. NOTE : -EV, -EB, -K suffixes are indications of military spec requirements for toughness, quietness, long service, and vibration resistant. All good tubes have the "OTK" bureau stamp (QA stamp).


http://www.tubedata.org/tubnum.html#cccp


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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Mon Sep 24, 2012 2:19 am
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Seems we could use a tube library or resource sticky, on this forum. Beemer, your info should really be stored on this forum. No BS !!! You and others have valuable knowledge worth archiving, here on this forum!!! Is it too exspensive ? Art

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Mon Sep 24, 2012 5:54 pm
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An FAQ section would be nice. A kinda out-of-date, but good start is Joe's Tube Lore:

http://www.audioasylum.com/scripts/d.pl ... tubes.html


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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Tue Sep 25, 2012 10:42 am
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aclempoppi wrote:
Seems we could use a tube library or resource sticky, on this forum. Beemer, your info should really be stored on this forum. No BS !!! You and others have valuable knowledge worth archiving, here on this forum!!! Is it too exspensive ? Art



+1Million...Good call Art :!: Would be great to have all that info in one place for reference :!:

T2

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Tue Sep 25, 2012 12:02 pm
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Bmmr,

Here are some tubes, maybe you can help ID some for me.
I have some of the MC1 GEC ECC83 tubes, and others. And look at the Raytheon tubes, they have the exact same build dates but way different tooling. One looks like a Mullard, seam top, silver inserts, hole in the side of the plates.

Those clear plastic cases on the bottom pic were bought at
Jo-Ann Fabric Shops for 1.00 each on sale, reg price was like 5.00 each. So I bought 150 of them. They hold 72 12ax7 sized tubes. You can cut the plastic dividers and then fit EL84 tubes. 4 12AX7 tubes fit into each small box perfectly. Made in USA Cases, I will UL the label of the manufacture. I use them for screws, amp restoration, resistors etc.. My Rhode-Runner stage helper has an Anvil case with these plastic cases in them, I'm telling you these are quality. When you snap them closed, they stay closed and don't pop-open when dropped. I like em because you don't have to open them up to see what's inside.

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Tue Sep 25, 2012 12:17 pm
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You can always tell which guys take their tubes seriously.

They keep these in their tube caddy......

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Nice set-up, paper.

Rawk on!

8)

Arjay

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Tue Sep 25, 2012 7:47 pm
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Paper. Some very nice tubes! BTW... Raytheon BP 12AX7(A) and 5751 are my favorite. Followed by 1949-51 made Sylvania long black plate, tilted square-getter JAN-JHS 12AX7. Both near unobtanium, now :(

Hamburg made Valvo and Munich S&H E83CC gold pins, also.

Check the bottom of those "seamed" 12AX7/ECC83 for Mullard/Philips/Valvo dating. It's usually in small black fonts and two lines. Manufacturer plant and date made.

My bet is those "Raytheons" are Brimars. Brimar made many US patented tubes for the English and other Euro military, during the 1950-70's. Story goes... "Brimar" = British Made American" spec tubes.

Their CV511/6V6GT(Y) are some of the best and first 6V6GT made in Europe. Along with Visseaux.

Philips/Valvo/Mullard factory/tube codes:

http://www.triodeel.com/images/philipstubecodes.pdf


Date codes:

http://www.cs.helsinki.fi/u/oheinone/va ... oding.html


Some ECC83/12AX7 examples:

http://www.tube-classics.de/TC/Tubes/Va ... /ECC83.htm


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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Tue Sep 25, 2012 9:09 pm
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I know about the etched codes at the base of the glass, the Phillips vs. Blackburn etc., my question is those 2 Raytheon
dated 63-45, one is a long plate and the other is a short plate. They have that Sylvanina black 12ax7 etched at the top of the tubes, or it looks like sylvania.

I have these fat-boy 5881 Raytheon tubes I use in my 80 watt Twins & Bassmans, I need to remove the spring clips so the tubes will fit well in the socket, I use those mesh holders to hold the tubes in. These Fat-Boys almost touch each other at the bases when installed in a 80 watt Tweed twin, they look massive in the amp and have a beautiful blue glow to them. The construction of the 5881 looks like the Tung Sol plates inside, do you know who made these? I have 3 sleeves of these great tubes left, 3 sets installed in the amps. One of the sleeves looks like the red bank made blackplates, much more heavy duty.

I will take a pic in the Twin tomorrow so you can see how close the bases are installed. They seem to have a little more power than the regular Tung Sol old stock 5881's.

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Tue Sep 25, 2012 9:34 pm
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Paper, prolly right about Sylvania made, Raytheon labeled 12AX7. BTW--- try some BP Syl (late 1940-early 50's), if you can find them. They are are good as any TFK smooth plate ECC83 or gold pin Euro E83CC.

That "Raytheon 5881" maybe a relabeled Sylvania 5932 (6L6WGA). A most excellent tube, indeed.

Gold lettered "12AX7" are reboxed in black and gold consumer boxes. Black "12AX7" are always in mil spec white boxes. FWIW.

Good luck with your valve collection!

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Wed Sep 26, 2012 8:57 am
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I just measured the distance between the 4 5881 Raytheon tubes on the Tweed twin and the distance is about 3/8" or just under. They are dual-side getter tubes with bright flashing, really nice tubes. I took the pic next tot he 6L6GC short glass so you can get an idea how big they are. These were manufactured in May of 1976. I have a hobbs hour meter in one Twin to keep track of the total time on the tubes. I use the meters on certain gear, at 10.00 each they are a steal. I have the meter 'plastic-cable-tied' to the power cord in the back of the amp, connected to the power switch, so total time is calculated. Some people put them on the standby for load time. On the BF Amps I have them inside the chassis next to the PT, so I need to pull the chassis to get a reading.

http://www.ebay.com/itm/140736571848

I fixed the Link.

It will be interesting to see how many hours these power tubes last on the metered Twin. This is the first time I used a real NOS set of matched tubes with a new meter to get an idea how many hours a good set of old stock tubes will last when biased right. I have a Super Reverb and Marshall 1987 with Meters so I will get an idea how long the EL34 NOS Mullards last and the 6L6GC RCA rubes. I get the EL34 Mullard GE labeled tubes from an old TV Show, 15.00 each back in the late 90s. Before ebay tubes were cheap.


Last edited by paper on Wed Sep 26, 2012 12:53 pm, edited 1 time in total.

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Wed Sep 26, 2012 9:37 am
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Here a pic of the handy clear tube cases, you can see the 4 pre-amp tubes fit in each compartment perfect. It saves so much time from opening all the small boxes for your pulls.
I saved plenty of the old Bugle Boy pre-amp tubes to safe-keep for my good Tweeds, Browns and Blonds. The Amperex seem to last a long time. The older labeled Amperex like in the 1957 era Tweeds only have the name on them, no Bugle Boy logo. I believe 1960 was the first year for the BB Logo? Do you know for sure?

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Wed Sep 26, 2012 11:55 am
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Great info here!

Many thanks.

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Wed Sep 26, 2012 6:57 pm
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Paper, BB were all Dutch made (usually Heerlen, Holland). Starting in mid 1950's thrhough late 1960's. There are some reposrt of 6922 (found in Tectronix scopes), made in the early 1970's.


You have some great tubes, there. You ever use the 5-star GE BP 5751 or windmill Raytheon 5751. Only the steel pin Valvo and S7H E83CC comes close in tone and long life. IMHO.


BTW... Tesla makes a very nice frame-grid. gold pin E83CC. Tooling is based in the famous and extrinct TFK ECC803S. Best are older Tesla's and not JJ's.

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https://www.tubeworld.com/5751ge5star.jpg


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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Thu Sep 27, 2012 10:20 pm
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The Tesla are great tubes, very hard to find now.

I organized my tube cases and took some pics. When the tube boxes are empty I flip them over, so all the tubes in this case are full.

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Post subject: Re: Tidbit on tube designations -special apps and commercial
Posted: Fri Sep 28, 2012 6:58 am
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paper wrote:
The Tesla are great tubes, very hard to find now.

I organized my tube cases and took some pics. When the tube boxes are empty I flip them over, so all the tubes in this case are full.

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So here we have it folks... Tube Porn! :)

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"You can't spend what you ain't got, you can't lose what you ain't never had" ~ McKinley Morganfield


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