#1
Hello all,
I recently decided to replace my MIG-50's tubes. I was just about to order 2 6L6s and 3 12AX7s from the Tubestore when I decided to check to make sure I had that right. That's when I began to hear online murmurs of weird tube names I've never heard of. Apparently, the MIG-50 uses the "Russian 6L6", 6P3S-E's. It also has been thrown around that it uses a 61NP and two 62NPs. Can somebody help me with this debacle?
This forum redirected me to the also attached French forum, but my French is spotty, mostly conversational, and I didn't want to Google Translate all of those posts.
Initial forum
French forum
Last edited by slimjimmypage at Mar 31, 2013,
#3
I haven't heard of them using an oddball Soviet power tube. The preamps originally were Soviet 6N2P, which is the practically the same thing as a 12AX7 with a different pin-out. You can have somebody rewire the amp. It's a pretty simple mod really.

The reason why I put "originally" in italics is there's a strong chance somebody rewired the amp already. 6N2P's are very cheap tubes but they don't sound all that great. Examine the tubes in the amp very close and determine what's in there, or have a tech look the amp over for you.
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Last edited by Flux'D at Apr 1, 2013,
#4
The 6N series uses 6V heaters - you can't just sub in a 12AX7 (12V heaters). You have to mod the heater circuit. Similarly if it has been modded to accept 12AX7's you can't just throw in a 6Nxx.
I actually have a switch on my champ so I can change the heaters and run either. I have quite a few Voshod 6N1P tubes I scored very cheap - they sound dull and lifeless so I never use them.
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Last edited by Cathbard at Apr 1, 2013,
#5
^Trust his words above mine. It appears I am wrong about the adapters as well, they're built for using 6N2P tubes in a 12AX7 amp. Not the other way around, which makes sense with what Cath said.
Endorsed by Dean Guitars 07-10
2003 Gibson Flying V w/ Moon Inlay
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SVK ELP-C500 Custom

1964 Fender Vibro Champ
1989 Peavey VTM60

[thread="1166208"]Gibsons Historic Designs[/thread]
#6
i am full on 12AX7's on mine. i bought it from a tech for a no pay customer after the contract was up to pay him. it was legitimently his, i made sure of that.

but he replaced all of the pots, jacks, caps, tube sockets, MM transformers, and set everything up for 12AX7's. brand new tubes he showed me with his tube tester. i payed somewhere in the middle of the $300 range.

that may have been pointless, the only thing he said and emphasized is that he modded the amp FOR 12AX7's (i didn't know what it was originally at the time).

but i really like it.

above all listen to cath.
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#7
I opened it up, and the owner before the last one (who hadn't played it in several years, and he used it as a bass amp) has switched the heaters. The tubes were unmarked, but I compared them to other tubes I have lying around and it looks like there are two 6L6s (5881s, Sovtek), and three 12AX7s. And I'm honored and flattered to be helped by cathbard.
#8
You're welcome. Glad I could help.


Stick JJ ECC83S tubes in it and maybe go for a JJ ECC803 in V1 if it's a head. The 803 is low noise and has a little more top end sparkle.

The best power tubes are SED (but they are expensive) followed by JJ. The JJ's are the best value for money.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
Last edited by Cathbard at Apr 10, 2013,