Nos I61 B0F Mullard?

Brandon · Post by **Brandon** » Mon Jun 04, 2012 1:43 pm

Can anyone tell me about a mullard 12ax7 with the code of I61 B0F?

Is it the same or similar as a I63, or a lot different (Construction, sonically etc)?

I have a chance to buy one that is in good condition and wanted to know a little more about it

Guitar5986 · Post by **Guitar5986** » Tue Jun 05, 2012 12:29 pm

They have less gain than an I63. People refer to the I63's as the "rock" tube and the I61's as the "blues" tube. I prefer I61's in the V1 position of my 10,000 series. Also, they are usually a tad darker than I63's from my experience.

Brandon · Post by **Brandon** » Thu Jun 07, 2012 1:33 am

thanks for the info!

Brandon · Post by **Brandon** » Fri Jun 08, 2012 9:58 pm

Do you know what's the deal is with the I62's? I heard something about that they're pretty rare and they only made them for like 4 months in 1964.

Do you know what tone they produce?

demonufo · Post by **demonufo** » Sat Jun 09, 2012 5:51 am

Didn't know there was such a thing as an I62 (and I'm not convinced there is either!)

Pretty sure there isn't an I64 either, and I65's are usually Heerlen produced.

Brandon · Post by **Brandon** » Sat Jun 09, 2012 1:53 pm

I have a Mullard/Rheem coming in today that's an I62. I'll let you know if it's legit and what it's like!

demonufo · Post by **demonufo** » Sat Jun 09, 2012 3:14 pm

Brandon wrote:I have a Mullard/Rheem coming in today that's an I62. I'll let you know if it's legit and what it's like!

Cool!

I suspect if they do exist, they might not necessarily be from the Blackburn plant though...

Brandon · Post by **Brandon** » Sat Jun 09, 2012 4:16 pm

Ok I got the I62 and it is legit, it sounds awesome!

It's says "Made In Great Britain" right on it and clear as day says I62. I'm really impressed with this tube's condition. The damn thing looks like it was made yesterday!

I can't say for sure whether it sounds more like a I61 or I63 yet, but it's in there right now with 2 I61's and I'm very pleased with the tone. But I do have a trio of I63's coming in soon so i'll be able to compare then.

But for now, it's def a mullard with that boomy, squeeky, sweet tone!

demonufo · Post by **demonufo** » Sat Jun 09, 2012 5:28 pm

Splendid news. Something new learnt.

Any date codes on the tube?

Brandon · Post by **Brandon** » Sat Jun 09, 2012 9:30 pm

We got:

B4e2

And

1022-5c8

Can you make anything out of that? I don't know date codes.

demonufo · Post by **demonufo** » Sun Jun 10, 2012 5:24 am

Okay, B is for Blackburn (so it IS Blackburn produced after all)
4 is the year, I think we can safely discount 1954 or 1974, so 1964 it is,
E is the 5th month of the year (May)
and the 2 is for the 2nd week of the month.

Brandon · Post by **Brandon** » Mon Jun 11, 2012 5:53 am

Hmm very interesting

Thanks for the date coding lesson haha

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