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Guitars, Gear, Tone!
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PostPosted: Wed, Mar 02, 2011 9:54pm 
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M4 seems to sound kinda flat compared to some other preamp sections I have, wondering if it might be those tubes at that back. Anyone ever replace those? Did it change/improve your sound much? If so, what did you put in there? :confused:


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PostPosted: Wed, Mar 02, 2011 10:56pm 
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I had mine blow (don't know which one) at a gig - and I didn't have any spares with me! :doh: Anyway, since then I've put a Tung-Sol in the bottom socket (labeled "12AX7"), and a Mullard 12AT7WA / CV4024 in the top socket (labeled "12AT7"). But I didn't like the tone as much - made it sound too thin I thought (I think the Mullard was the main culprit there, not the Tung-Sol). But when I put a pair of Groove Tube 12AX7-Rs that I bought at Guitar Center (what can I say - it was a Sunday), they actually sounded really good. Right now though I have a pair of Egnater labeled Sovtek 12AX7WAs, which also sound just as good to me.

Note that Bruce has stated on this forum that the socket labeled "12AT7" no longer requires a 12AT7 and that a 12AX7 (or equivilant) is fine.

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PostPosted: Thu, Mar 03, 2011 12:32am 
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I used a pair of NOS GE's, and it made the preamp come to life.

They DO make a difference.

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PostPosted: Thu, Mar 03, 2011 1:03am 
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Thanks for the advice guys. really appreciate it! :2thumbsup:


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PostPosted: Thu, Mar 03, 2011 1:56pm 
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guitarslinger wrote:
I used a pair of NOS GE's, and it made the preamp come to life.

They DO make a difference.

OK Gene - you've piqued my curiosity :yes: . . . which NOS GE's are you using specifically?

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PostPosted: Thu, Mar 03, 2011 2:31pm 
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HughJasol wrote:
guitarslinger wrote:
I used a pair of NOS GE's, and it made the preamp come to life.

They DO make a difference.

OK Gene - you've piqued my curiosity :yes: . . . which NOS GE's are you using specifically?


whichever ones came in that shoebox from the electronics graveyard that has since closed :(

I'm using a 12AT7 in the 12AT7 position. (actually, now that I think about it, this might be an RCA.

The GE is just a 12AX7A with long gray plates.

that's all I know. It's loud, clear, smooth, etc. It's just RIGHT. :rock: :rock:

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PostPosted: Thu, Mar 03, 2011 2:41pm 
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Thanks Gene - I might try this out (if it doesn't break the bank that is) . . .

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PostPosted: Thu, Mar 03, 2011 4:56pm 
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You guys happen to know the function of these tubes and what kind of characteristics make an ideal tube for these spots?


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PostPosted: Thu, Mar 03, 2011 5:08pm 
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I did at one time, but I don't remember any more . . . :confused: Bruce could tell us, but I know he's really busy lately . . .

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THE REST: Image (x2) Line 6 Relay G90 & G50 Wireless Mission Pedals.

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PostPosted: Fri, Mar 04, 2011 8:24am 
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follow up!

I had it backwards. Sorry for the confusion.

the 12AX7A = an RCA. here it is.
http://www.kcanostubes.com/content/anos-rca-12ax7a

the 12AT7 = a JAN GE
http://www.kcanostubes.com/content/nos-jan-ge-12at76201

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PostPosted: Sun, Mar 13, 2011 2:19pm 
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The top one is the input tube that is common to all the channels. The equivalent of V1 in a "normal" amp. The other tube is the output buffer that is also common to all channels but does not provide any gain.


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PostPosted: Fri, Mar 18, 2011 8:30am 
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I replaced the 12ax7 and 12at7 with groove tubes 12ax7 and 12at7.

When my amp is working I notice they rig drives a little more with them in.

I am not sure if that is because they are new or just different.

I had to buy them local in an emergency, I plan to order the Egnater OEM tubes ASAP and use the groove tubes as spares.

I loved what I had and see no reason to change it. If I get bored I'll just buy another module. :-)

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PostPosted: Fri, Mar 18, 2011 9:42am 
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Location: Pulling into the GAS station.....
Correct me if I am mistaken, but Egnater shipped these with Sovteks......

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PostPosted: Fri, Mar 18, 2011 10:53am 
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rlord1974 wrote:
Correct me if I am mistaken, but Egnater shipped these with Sovteks......


No correction needed. :) :thumbsup:

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PostPosted: Sun, Mar 20, 2011 11:30pm 
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Sovtek 12AX7WA.

cheap and solid!

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