Is this a Mullard

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DaveW
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Is this a Mullard

Postby DaveW » Wed 12/14/11 12:45 pm

I have just got a pair of EL34s off eBay. One is definitely a Blackburn Mullard xf3 the other is physically identical in every way (even got a hole in the locator) but has no codes.

Is has a label saying made for GEC, has anyone seen a Mullard EL34 with no codes?

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p_christov
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Postby p_christov » Thu 12/15/11 5:39 am

It looks like xF4 Mullard cause it has 4 notches on the mica spacers. Maybe the codes have been rubbed off.
I can't tell from this picture only but if you say the construction is the same as Mullard it probably is one (the other EL34 always differ in some way).
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Daviedawg
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Postby Daviedawg » Thu 12/15/11 8:18 am

Have you tried the fridge/condensation trick to look for remnants of print?

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DaveW
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Postby DaveW » Thu 12/15/11 4:49 pm

Thanks for the help guys

p_christov is spot on with the 4 mica contacts points so it looks like it is an xf4. Daviedawg thanks for the suggestion, I have now tried the condensation technique but still can't find any codes.



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p_christov
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Postby p_christov » Fri 12/16/11 4:34 am

You can check also for manufacturer code on the printed GEC label. They were using the same codes as on the CV valves. For Blackburn it must be "DA" (look at the lower right corner).

I'm pretty sure it's a Mullard cause I haven't seen EL34 other than xF4 with four notches on the top mica.
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dotfret
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Postby dotfret » Tue 05/01/12 11:12 pm

It is possible that the code was printed on the base - try the fridge trick again, and look at the base, not the glass.

Then again, remember that GEC invented the EL34, and the Mullard version is a licensed copy ...
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