Webcor 12AU7 is it a Mullard? - diyAudio
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Old 1st February 2012, 03:38 PM   #1
sbelyo is offline sbelyo  United States
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Default Webcor 12AU7 is it a Mullard?

I got a Webcor 12AU7 off of ebay and I read that these are rebranded Mullards. It has made in Great Britain on it with the Webcor logo. On the bottom in the glass looks to be a Q

I can tell you that it sounds relly clean and clear. Similar to a telefunken but not as warm. It's a very detailed tube.

Do you think this is a Mullard?
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Old 1st February 2012, 04:07 PM   #2
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Does the top of the envelop,where the little nipple is have an "X"?
IIRC not all Mullards had that X,but if it does,it's almost certainly a Mullard.
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Old 1st February 2012, 04:21 PM   #3
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Mullard, Philips, and Valvo Tube Codes
Philips/Valvo/Mullard Valve Codes
Valve manufacturing codes

A Mullard will start with a B = Blackburn

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Old 1st February 2012, 04:30 PM   #4
DF96 is offline DF96  England
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Mullard had other factories, and some valves were made to the same design in Philips factories. A photo would help.
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Old 1st February 2012, 05:41 PM   #5
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Any photo?
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Old 1st February 2012, 08:49 PM   #6
sbelyo is offline sbelyo  United States
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I'll try and post some photos and the date code tonight
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