Stock Marshall Tube Codes

mickeydg5

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"No Selection" means the preamp tube was not selected for a specific purpose. So it is an average or standard used tube as you put it.
Selected tubes would be for gain or microphony level.
 

dan_tramble

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I have a couple of the gold "high micropony" tubes..

Does this mean they have a high noise floor? What position would you use that tube in a amp?

I have some red "low micropony" ones plus a half dozen of the standard 00055 white ones.

Thanks
 

Matus

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Hi everyone..new to this forum! Owner of VM2466 which is currently waiting to be repaired :/ great amp tho!

Anyway...as i was messing about trying to find out what's up with it, I pulled out all tubes to check them and that's what brought me to this thread...

I have a ecc83 0066 in V1 and the rest are 0055...i'm about to change them too but I couldn't find any info on which is the right/better type of tube to use or of it's ok to mix and match like I had?!

Thanks guys!
 

Mark V

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maybe the mods like to make this a sticky?
coming from the dutch importer of marshalls
these are the codes printed on stock marshall tubes with a description what brand or type they actually are... the list is not entirely complete, but covers a lot of the actual tubes being used by uncle jim today

VLVE-00007 12AT7/ECC81 No selection White Logo
VLVE-00009 12AU7/ECC82 No selection White Logo
VLVE-00010 EL34 Svetlana
VLVE-00033 SV6550C Svetlana White Logo
VLVE-00038 6V6GT Shuguang White Logo
VLVE-00039 KT66 Shuguang White Logo
VLVE-00042 EL34B Shuguang Gold Logo
VLVE-00047 12AX7B/ECC83 Shuguang Low Microphony Gold Logo
VLVE-00049 12AX7B/ECC83 Shuguang High Microphony Gold Logo
VLVE-00055 12AX7B/ECC83 Shuguang No Selection White logo
VLVE-00063 12AX7B/ECC83 Shuguang A Low Microphony White Logo
VLVE-00064 12AX7B/ECC83 Shuguang B Low Microphony White Logo
VLVE-00065 12AX7B/ECC83 Shuguang Gain Selected >=4V White Logo
VLVE-00066 ECC83S JJ Low Microphony Red Logo
VLVE-00066S ECC83S Microphonic Selection A
VLVE-00067 ECC83S JJ Low Microphony Red Logo
VLVE-00067S ECC83S Microphonic Selection A
VLVE-00068 EL84 JJ Graded Low Anode Current Red Logo
VLVE-00069 EL84 JJ Graded High Anode Current Red Logo
VLVE-00070 EL34 JJ Graded Anode Current Red Logo
VLVE-00071 EZ81 JJ No selection Red Logo
VLVE-00077 KT66 Shuguang Graded Anode Current Gold Logo
VLVE-00080 KT88 Shuguang Graded Anode Current Gold Logo
VLVE-00083 5881/6L6WGC Shuguang Graded Anode Current Gold Logo replaces VLVE-00006
VLVE-00087 EL34B Shuguang Graded Anode Current White Logo
VLVE-00088 GZ34/5AR4 JJ No selection Red Logo Replaces VLVE-10043
My Red logo Marshall valve ECC83 is called vlve-90067. Are you saying this is the JJ low ?
 

Herman Toothrot

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Hi! Some days ago, I was offered a matched quartet of 6550 marshall stock valves in a Spanish local shop, they were coded VLVE-00033, so I know they're winged "C" Svetlana. They also had a brown dot sticked on its base. I suppose these serve as markers for matching purposes, following some kind of color code. Does anyone knows if those colors are associated with some kind of values that should be taken into account in the re-biasing?

Ps. English is not my mother tongue, sorry for any mistakes.
 

mickeydg5

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Marshall does not color code power tubes as far as I know. So the brown stickers may indicate testing my another party.

Winged C Svetlana tubes are good/great as long as they have not been worn out.
 

sellen

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VLVE-00049 12AX7B/ECC83 Shuguang High Microphony Gold Logo made my 1959hw more what i expect it would be . With the stock -VLVE-00066 ECC83S JJ Low Microphony Red Logo , it was a bit dull for my taste
Just sayin' :)
 

Joska

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IMG_0968.jpeg IMG_0969.jpeg Does anyone know who made this ones, i got them allmost for free and they do sound as good,if not better as Svetlana winged"C"?
 

boola1

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View attachment 45071 View attachment 45072 Does anyone know who made this ones, i got them allmost for free and they do sound as good,if not better as Svetlana winged"C"?

Old post I know but those look like Mullards. I see some writing on them. If they have XF4, they are Mullards which would explain why they sound so good, even though they are over 30 years old.
 

Len

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Some are described as "High Microphony"? Why would you want a high microphony tube?
 

SkyMonkey

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I have recently changed the valve in a 2nd hand MkII Valvestate VS65R for a JJ ECC83s. This greatly improved the tone of the amp in general and fixed the issues I experienced with the OD channel (buzzing & after-note artifacts). I think it also helped improve the onboard spring reverb and EQ somewhat, but I may be deluding myself (the bass knobs don't do much past 12 O'clock).

The valve that came out was completely blank. No codes or writing of any sort. (I think I can see the faintest impression of a single J, offset in the middle of the ring of pins underneath, but that is it!
This amp is from 1997 according to the bar code on the back panel, but there is no way of knowing if this was the original valve.

Was this usually the case with the Valvestate amps. I am thinking that no one would purposefully replace the valve with something that has no provenance whatsoever. So did Marshall maybe put "No Brand" B-stock valves in Valvestate amps at the factory (Made in England).
 

Melodyman

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Those tubes in the first pic with the white script logo and the EL 34 M appear to be Groove Tubes copy of the Mullard EL34, thus the M as this is how GT named them after the Mullards they were copied from.. Obviously rebranded for Marshall..GT also had EL 34 R for russian, EL 34 C for china etc..
 

cooljuk

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From a 2016 1959HW:

VLVE-00104 Marshall branded, black ink, marked "MADE IN RUSSIA" EL34s with brown bases. "TUNG-SOL" screened on bases.
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I don't think those have been listed in this thread yet.

To me, they look like the similar brown base Tung-Sols from New Sensor without the Marshall logo, and with the different base printing. Same hook/spacers, getters and 5 spot welds per side.



VLVE-00066 Red Ink short plate JJ 12AX7s are the preamp tubes in this one.
20190415220649-61e5e095-xl.jpg
 

L902

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Hi guys, I found an old Marshall 12ax7 in a JCM900 MKIII I picked up. It was in the phase inverter v3 spot and labelled VLVE-00052. I emailed Marshall to ask them what this tube was and they told me VLVE-00049 is the new code for VLVE-00052. I wrote back once more to confirm that they meant these tubes are identical and they said yes.

VLVE-00052 is already in the list on this page as 'Shuguang High Microphony Gold Logo' but figured I would post this in case anyone wanted to update the list and add VLVE-00049.
 

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