Tube help
- Thread starter Slash2987
- Start date
Nite_Maresz_25
on Elm Streetologist
Re: Tube help
If this is your problem, here is the answer. ecc81 and 12at7 are the same tubes, just different names. IIRC the ECC titles are the british names and the 12 titles are american.
If this is your problem, here is the answer. ecc81 and 12at7 are the same tubes, just different names. IIRC the ECC titles are the british names and the 12 titles are american.
Zhangliqun
Questionologist
Re: Tube help
Exactly right -- I've made that swap myself.
Exactly right. The AT7 gives you only 70% as much gain as the AX7.
But my question is: Is there a preamp tube that is somewhere between the AT7 and AX7 gain-wise? Like 80-85% of an AX7?
>
YJM_Rocks said:
Exactly right -- I've made that swap myself.
YJM_Rocks said:
Exactly right. The AT7 gives you only 70% as much gain as the AX7.
But my question is: Is there a preamp tube that is somewhere between the AT7 and AX7 gain-wise? Like 80-85% of an AX7?
>
marvar
New member
Re: Tube help
[QUOTE
But my question is: Is there a preamp tube that is somewhere between the AT7 and AX7 gain-wise? Like 80-85% of an AX7?
>[/QUOTE]
About the only other option is a 12DW7- you may or may not be able to use this tube depending on how your amp is wired- the 12DW7 is 1/2 12AX7 and half 12AU7.
[QUOTE
But my question is: Is there a preamp tube that is somewhere between the AT7 and AX7 gain-wise? Like 80-85% of an AX7?
>[/QUOTE]
About the only other option is a 12DW7- you may or may not be able to use this tube depending on how your amp is wired- the 12DW7 is 1/2 12AX7 and half 12AU7.
Gearjoneser
Gear Ho
Re: Tube help
Just use the correct values for your amp. More than likely, the AT7's aren't part of your preamp's signal path, so it won't matter. They may be a reverb driver or phase inverter.
The AX7's are probably furthest from your power tubes, making them the 1st and 2nd gain stages.
Just use the correct values for your amp. More than likely, the AT7's aren't part of your preamp's signal path, so it won't matter. They may be a reverb driver or phase inverter.
The AX7's are probably furthest from your power tubes, making them the 1st and 2nd gain stages.
Zhangliqun
Questionologist
Re: Tube help
I put some AT7's in my Fender Hotrods so that I could make more precise volume adjustments. With the AX7's, the jump in volume on the master volume from 1.63 to 1.78 or 1.9 to 2.2 is just ridiculous -- such a hair-splitting difference and you either can barely hear it or it's knocking the walls down. This is not a problem at a gig where I'm up around 3 or 4 or more (the taper levels out up there), but for practicing in my apartment, it can be annoying.
My Hotrods still are a little touchy that way but the AT7's did help some. Sure the gain is reduced for the drive channel but I don't look for overdrive from my Hotrods (lousy to begin with), I want them for the killer clean tone so I get my crunch from a Maxon Overdrive Pro stompbox.
Gearjoneser said:
I put some AT7's in my Fender Hotrods so that I could make more precise volume adjustments. With the AX7's, the jump in volume on the master volume from 1.63 to 1.78 or 1.9 to 2.2 is just ridiculous -- such a hair-splitting difference and you either can barely hear it or it's knocking the walls down. This is not a problem at a gig where I'm up around 3 or 4 or more (the taper levels out up there), but for practicing in my apartment, it can be annoying.
My Hotrods still are a little touchy that way but the AT7's did help some. Sure the gain is reduced for the drive channel but I don't look for overdrive from my Hotrods (lousy to begin with), I want them for the killer clean tone so I get my crunch from a Maxon Overdrive Pro stompbox.
Last edited:
Trilogy
New member
Re: Tube help
Yeah actually they were. Groove Tubes.
Edit;
http://www.groovetubes.com/tubes_list.cfm?ObjectGroup_ID=107
aleclee said:
Yeah actually they were. Groove Tubes.
Edit;
http://www.groovetubes.com/tubes_list.cfm?ObjectGroup_ID=107
Last edited:
Curly
Moe's Bluesman
Re: Tube help
try reviewing this article from KCA NOS:
preamp tubes
yes, some tube swaps are OK, but it helps if you know the comparisons, and understand the reason for doing a swap
personally, I usually end up preferring the stock tubes. The one substitution I liked was switching the first 12AX7 in a Bassman reissue for a 12AY7, which is what the original circuit had anyway. The lower gain 12AY7 seems to make that amp a little sweeter.
you will also find more info on tube swapping at guitar amp blueprinting
try reviewing this article from KCA NOS:
preamp tubes
yes, some tube swaps are OK, but it helps if you know the comparisons, and understand the reason for doing a swap
personally, I usually end up preferring the stock tubes. The one substitution I liked was switching the first 12AX7 in a Bassman reissue for a 12AY7, which is what the original circuit had anyway. The lower gain 12AY7 seems to make that amp a little sweeter.
you will also find more info on tube swapping at guitar amp blueprinting
