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Best preamp tube for increased headroom?

 
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Ricey
RM100


Joined: 10 Jan 2009
Posts: 132

PostPosted: Mon Aug 14, 2017 9:22 pm    Post subject: Best preamp tube for increased headroom? Reply with quote

What would be the best replacement preamp tube(s); e.g., 12AY7, to increase headroom in a stock Randall Tweed Module. I can get a great sparkly clean tone with the gain below 10 o'clock, but it starts breaking up quite a bit after that with humbuckers. I am using that module in channel 1 in my RM100 combo as my primary clean channel, so I would really like some additional headroom. Can tubes be mixed and matched in the modules; e.g., mix a 12AY7 with a 12AX7 or do they both need to be the same? GC has lower gain 12AT7s, not 12AY7s, but I notice 12AT7s seem to be mostly be used as phase inverter tubes, so I did not buy one.
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Spencer4hire
RM100


Joined: 03 Mar 2006
Posts: 196
Location: Camas Washington

PostPosted: Mon Aug 14, 2017 10:56 pm    Post subject: Reply with quote

Try a 5751 there.
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tschrama
RM100


Joined: 04 Jun 2014
Posts: 207
Location: Netherlands

PostPosted: Tue Aug 15, 2017 4:03 am    Post subject: Reply with quote

Why dont you turn down the gain below 10 oclock?
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Mattfig
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Joined: 22 Jun 2010
Posts: 5659
Location: Hurtling through space on a wet rock.

PostPosted: Tue Aug 15, 2017 6:11 am    Post subject: Reply with quote

5751 for sure
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warmachine67
RM50


Joined: 20 Apr 2017
Posts: 67
Location: Alabama

PostPosted: Tue Aug 15, 2017 7:03 am    Post subject: Reply with quote

You can mix types in a module without any problems. I have had luck even using a 12at7 in either one or both positions of Fender type modules. I've mixed 12at7's with au7's and ax7's in any arrangement and it changes the headroom to varying degrees.

But, 5751 is great too and sort of between a 12ax7 and a 12au7. You usually have to go somewhere online to find them since GC probably won't stock then.

Whatever you choose, I recommend using a JJ brand in the right hand tube (looking at the face plate / knobs) position.
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Ricey
RM100


Joined: 10 Jan 2009
Posts: 132

PostPosted: Tue Aug 15, 2017 9:40 pm    Post subject: Reply with quote

So is the tube on the right side V1?
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RM100/RM50 Combos; KH-1, Blkfc,Twd, Plx, Brwn, 1086, SL+, Recto and Ult XL; Jackson Fusion; LP, AmDlx Strat; CP Jag HH, Cobain Stang; Boss, MXR, Dunlop, DOD, Dgtec, Sldgld, Barber, Way Huge, Pigtronix, Maxon, TC, ProCo, Menatone, Earthquaker, and Tech21.
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warmachine67
RM50


Joined: 20 Apr 2017
Posts: 67
Location: Alabama

PostPosted: Wed Aug 16, 2017 2:44 am    Post subject: Reply with quote

I believe it to be v2, and the one on the left (looking at the faceplate) is v1
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