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24.26.2.208
I have this pair of these, and they have no etched codes that I can find. Has GT. Britain on the bottle, but that doesn't necessarily mean anything. Did International rebrand tubes? Their location is in Huntington NY.
Edits: 01/12/12Follow Ups:
These are Toshiba made tubes. Look to the holes in the bottom mica! A very good tube IMO.
Every true Mullard 9 pin miniature tube I seen has a seamed glass joint on top. Also, etched code on side of glass at bottom area.
i have several ECC8x mullards (B coded = mullard/blackburn) that wear siemens or valvo stamps...
N.
Hi
The full name of the company was International Service Master, a distributor / rebrander. They supplied generic replacement tubes through mom and pop electronics parts stores.
I have seen Russian 6DJ8s, Tesla and several other east european (soviet block) tubes branded International.
I hope this helps.
I have never seen a two rib plate before which was puzzling. The Tubemonger kindly supply a link to their archive, and the Toshiba does have a two rib plate. Anyone have any experience with Toshiba tubes? Thanks
"IEC Servicemaster bought the rights to market Mullard tubes during the 1960's and 70's, so many Mullard tubes are dual marked "IEC Mullard". These are still genuine Mullard tubes. Mullard also marketed a special version called their 10M series."
I agree "First, your 10Ms are not Mullard if they have no etched date codes."
But there are real IEC Mullard 10M tubes. I have 4 of them. 3 12ax7 and 1 12au7.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
First, your 10Ms are not Mullard if they have no etched date codes. IEC, who used the EIA number 1022, culled tubes from way too many sources. If it's not etched at the bottom, it's not the real stuff. Look at their early dark blue boxes. They even copied the Mullard boxes and still sometimes put Japan sourced tubes inside.
During the mid to late '70s and early '80s audio craze, it was common to run into what we called "bootleg" tubes. It seems distributors were rebranding tubes since the '40s. Rebranding can be good; or it can really be bad. Let us say RCA found not so strong 6V6 tubes after manufacture; then sold them, as seconds, to the distributors via auction. The distributors simply retested; then rebranded and reboxed. This has been going on way too long.
Remember the Siemens copy of the smooth plate Telefs ? Today, these Siemens tubes are collectible ? Why ? They do not sound great like Telefs. Buyer beware is appropriate here. Be skeptical when buying expensive tubes that don't look right. In 1980, one of the distributors was nearby. I knew some of the back room techs. I strolled in one day looking for NIB EF86s. I expressed a desire for Mullards. The saleswoman said to give her an hour to get 'em ready. Little did I know I was going to get bootleg Mullards, with freshly embossed Mullard shield logos and crisp light blue boxes, labelled Z729; the premium version. No etching to be found, I ran home to try these anyway. They were reasonably priced back then. They tested fine and sounded fine. They lasted for years; many years. But, they only looked like Mullards; maybe. Were they Brimars or Siemens ? Who knows for sure ?
We all need to be vigilant about this. Today, there are bootleg Telefs with fresh boxes ! Yes, fresh pretty boxes; with long flaps like the real ones. If you sense "these are too good to be true" they might be "repros" or bootleg stuff...
The tubes in the picture are not Mullards , could be Brimar but I'm not 100% sure
Al
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