NOS '71 MULLARD?

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NOS '71 MULLARD?

Postby Roger » 05 Oct 2017, 13:16

Hi guys
I recently bought these valves. According to the seller are a new Marshall of 1971 manufactured by Mullard. I bought them at on Ebay auction, good price. Someone knows if they are really Mullard valves. I have my doubts. The tubes sounds good, I like it.

The codes are two ECC83 N3Wk3, one ECC83 C4WA4. Four EL34 e4w82 or e4w84.
Thanks for advance
Attachments
Mullard set (1).jpg
Mullard set (1).jpg (958.85 KiB) Viewed 242 times
Mullard set (2).jpg
Mullard set (2).jpg (864.18 KiB) Viewed 242 times
Mullard set (3).jpg
Mullard set (3).jpg (910.56 KiB) Viewed 242 times
Mullard set (4).jpg
Mullard set (4).jpg (933.26 KiB) Viewed 242 times
:whatever. SORRY for english level
MARSHALL:TSL100/6100LM/JCM900 MKIII 50w/VM2466/JVM1H/
Lead12 5005(moded)
Lead 1960A/1965A/Vintage 1936/Lead 1936
Blackheart BH15H(moded) 7W-15W
Madamp J5MK1(moded 5W-10W)
Arial 4X12 60W
Peavey XRD680
:Cheers

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Re: NOS '71 MULLARD?

Postby surfnorthwest » 05 Oct 2017, 15:36

The factory, date of manufacture and revision of a particular tube can be determined from a code that was etched into the side of the glass envelope (the colour of the lettering, i.e. yellow-print or white-print has no bearing on the quality of the tube). This site has good information in helping to identify old valves.
http://www.audiotubes.com/mullcode.htm


Looking at the photograph of the Mullard ECC83 it can be seen that the code is written in two lines. The top line is the three character ‘Engineering Change Code’ which would have allowed engineers to keep track of the various revisions of tubes as they were improved and developed. The first two characters indicate the tube type, in this case ‘I6′ indicates the tube is an ECC83. The third character indicates the different construction processes or materials used in its manufacture. For example different metals (copper, etc) utilised to construct the grid support rods, etc


Image


The bottom line is the date code is which is composed of four characters if the tube was manufactured after 1960 or three characters prior to this date. The first character represents the factory code. Below is a table of the most significant European factories/plants for Mullard-Philips tubes:


Code Manufacturer Factory

B Mullard Blackburn, Great Britain
G Mullard Fleetwood, Great Britain
J Mullard Tottenham, Great Britain
R Mullard Mitcham, Great Britain
X Philips Sittard, Holland
Y Philips Sittard, Holland
+ Philips Sittard, Holland

The second character indicates the year of manufacture. For the date code shown in the picture, the ’9′ indicates either 1969 or 1979 depending on the change code. Tubes manufactured during the late 1960s into the 70s were marked with the engineering change code ‘I63′.

The third character indicates the month of manufacture:

A – January
B – February
C – March
D – April
E – May
F – June
G – July
H – August
I – September
J – October
K – November
L – December

And the fourth character is the week of that month. This ECC83 tube was manufactured in the Mullard Blackburn factory in the 3rd week of November 1969. This gives just a brief insight on how to interpret those cryptic codes etched into the glass.
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Re: NOS '71 MULLARD?

Postby Roger » 05 Oct 2017, 18:00

:Thumbs Thanks Surf

Into the side of the glass envelope doesn't appears any code. No logo on El34. All letters in white. I tried in my TSL100. Preamp tubes are quite and clean but great gain. The power tubes are clean sound and big headroom. Sounds cool in one highgain amp.
Attachments
IMG_20171006_024143.jpg
IMG_20171006_024143.jpg (1.13 MiB) Viewed 223 times
:whatever. SORRY for english level
MARSHALL:TSL100/6100LM/JCM900 MKIII 50w/VM2466/JVM1H/
Lead12 5005(moded)
Lead 1960A/1965A/Vintage 1936/Lead 1936
Blackheart BH15H(moded) 7W-15W
Madamp J5MK1(moded 5W-10W)
Arial 4X12 60W
Peavey XRD680
:Cheers

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Re: NOS '71 MULLARD?

Postby Roger » 06 Oct 2017, 10:22

Hi, the only codes I see are in the base of the ECC83. the number 4 is the ecc83 c4wa4. The numbers 11 and 12 with a 6 are the other two ecc83 N3Wk3.
Attachments
IMG_20171006_181450.jpg
IMG_20171006_181450.jpg (1.16 MiB) Viewed 209 times
IMG_20171006_175755.jpg
ecc83 boxes
IMG_20171006_175755.jpg (838.9 KiB) Viewed 209 times
:whatever. SORRY for english level
MARSHALL:TSL100/6100LM/JCM900 MKIII 50w/VM2466/JVM1H/
Lead12 5005(moded)
Lead 1960A/1965A/Vintage 1936/Lead 1936
Blackheart BH15H(moded) 7W-15W
Madamp J5MK1(moded 5W-10W)
Arial 4X12 60W
Peavey XRD680
:Cheers

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Re: NOS '71 MULLARD?

Postby TM1 » 06 Oct 2017, 17:11

I could be wrong, but I don't ever recall seeing "Marshall" screened on any valves until the late 70's. The only accurate way to know if it's a Mullard is the etched into the side of the glass.

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Re: NOS '71 MULLARD?

Postby surfnorthwest » 06 Oct 2017, 18:53

Your going to rack your head trying to figure it out man, just don't worry about it. Today there are very few reputable dealers of old tubes, for ever good dealer there are 100 bad ones.

Bottom line is old valves really do not sound that much better than new modern production, you could run tests and most fail them....what old tubes do is last a lot longer than the new ones. If these ones you bough sound good just go with them. Doing something like upgrading your speakers or pickups will do far more for your sound than old tubes.
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Re: NOS '71 MULLARD?

Postby Anitoli » 06 Oct 2017, 21:09

Or just simply try a different brand of strings. That will give you the most immediate change in sound and even if you hate them you are only out $10 bucks or less.

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Re: NOS '71 MULLARD?

Postby Roger » 07 Oct 2017, 08:13

Thanks guys, the tubes cost me 71 euros including the shipment.
The ones that I like most are the ecc83, the TSL100 is not the best amplifier to appreciate differences between valves but if the old tubes are very worn when you test the new tubes you feel the difference. The VM it's better to test tubes.
:whatever. SORRY for english level
MARSHALL:TSL100/6100LM/JCM900 MKIII 50w/VM2466/JVM1H/
Lead12 5005(moded)
Lead 1960A/1965A/Vintage 1936/Lead 1936
Blackheart BH15H(moded) 7W-15W
Madamp J5MK1(moded 5W-10W)
Arial 4X12 60W
Peavey XRD680
:Cheers

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