Mullards branded as Telefunkens???

safetyman · 8th August 2005, 03:13 PM

Does anyone know for a fact that Mullards did or did not manufacture for Telefunken? The reason for asking is coz I bought a pair of Telefunken 12AX7 which had no <> at the bottom, but the letterings were partially smeared off. The seller told me that these were Mullard made Telefunkens. Is this a fact???

Colt45 · 8th August 2005, 08:08 PM

quite possible.

look for the acid etch code on it to see where it was made

safetyman · 9th August 2005, 07:00 AM

Maybe someone can help me with the codes. The markings on 1 tube is I63 and underneath that are the letters B8A4 and on the other tube is I63 and B7L3.

Could someone please assist or point me to any good resources for me to research the date codes?

Colt45 · 9th August 2005, 07:20 AM

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

safetyman · 9th August 2005, 01:22 PM

Colt, thanks. That is a very helpful guide.

316a · 9th August 2005, 07:36 PM

Quote:

I63 and B7L3

Blackburn 1967 or 1977 , 'shortplate' version ECC83 with nickel grid posts

cheers

316a

amperex · 10th August 2005, 12:58 AM

Yes, Mullard manu for Telefunken. No triangle at bottom of glass means not a true Telefunken W. German manufactured tube.

safetyman · 10th August 2005, 03:46 AM

Quote:

Blackburn 1967 or 1977 , 'shortplate' version ECC83 with nickel grid posts

Thanks 316a and Amperex. I came to the above conclusion after researching the pdf file link that Colt gave. I am learning about tubes and how to decipher them. Very interesting.

8th August 2005, 03:13 PM	#1
safetyman diyAudio Member Join Date: Jan 2004 Location: Terengganu, Malaysia	Mullards branded as Telefunkens??? Does anyone know for a fact that Mullards did or did not manufacture for Telefunken? The reason for asking is coz I bought a pair of Telefunken 12AX7 which had no <> at the bottom, but the letterings were partially smeared off. The seller told me that these were Mullard made Telefunkens. Is this a fact??? __________________ Shehzad Aleph 3 - Diehard fan

9th August 2005, 07:00 AM	#3
safetyman diyAudio Member Join Date: Jan 2004 Location: Terengganu, Malaysia	Maybe someone can help me with the codes. The markings on 1 tube is I63 and underneath that are the letters B8A4 and on the other tube is I63 and B7L3. Could someone please assist or point me to any good resources for me to research the date codes? __________________ Shehzad Aleph 3 - Diehard fan

9th August 2005, 01:22 PM	#5
safetyman diyAudio Member Join Date: Jan 2004 Location: Terengganu, Malaysia	Colt, thanks. That is a very helpful guide. __________________ Shehzad Aleph 3 - Diehard fan

10th August 2005, 12:58 AM	#7
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Yep.... Yes, Mullard manu for Telefunken. No triangle at bottom of glass means not a true Telefunken W. German manufactured tube.

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8th August 2005, 08:08 PM	#2
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	quite possible. look for the acid etch code on it to see where it was made

9th August 2005, 07:20 AM	#4
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	http://www.triodeel.com/images/philipstubecodes.pdf

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