Changed tubes in my T-Verb combo and bass thump is gone.

[mbmesa]

I changed the power tubes in my T-Verb combo from the stock MESAs to TAD 6L6 GC - STR and my bass response seems SIGNIFICANTLY reduced. I used to be able to "chuga-chuga" with this amp and get amazing bass thump response out the 2x12 combo but now I have the bass up at 3 o'clock and it still does not equal the bass response with the Mesa tubes. Can power tubes affect bass response that much ? Or does Bass response depend more on preamp tubes ?

 

[fluff191]

You sure something else isn't going on? Those TAD's have more thump than alot of 6L6 tubes out there.

 

[R_ADKINS80]

Yeah bro...those TAD 6L6GC's have the most thump out of any 6L6 in my collection including =C=

 

[mbmesa]

I guess I have to start looking at preamp tubes then. I can also check the bias current and voltage on the power tubes (using a Bias-Rite) to make sure the tubes are in spec for a Mesa. I got them from Doug's tubes so I don't expect it to be a problem.

I'll start swapping out pre-amp tubes and see if I can get the bass response back. Any particular pre-amp tube have the biggest effect on tone ? I guess V1 might be it. I currently have a tung sol reissue in there.

 

[elvis]

Did you change the preamp tubes? If you only changed the power tubes, and then the tone changed, then it's the power tubes, not the preamp tubes.

 

[Anonymous]

You sure something else isn't going on? Those TAD's have more thump than alot of 6L6 tubes out there.

+1 TAD's= lots of bass!!!!!!!!

try putting back the original power tubes :wink: and if everything goes back to normal, then you can assume that you got a bad batch of TAD's from your supplier!!!!!

good luck

 

[LerxstLee]

I changed the power tubes in my T-Verb combo from the stock MESAs to TAD 6L6 GC - STR and my bass response seems SIGNIFICANTLY reduced. I used to be able to "chuga-chuga" with this amp and get amazing bass thump response out the 2x12 combo but now I have the bass up at 3 o'clock and it still does not equal the bass response with the Mesa tubes. Can power tubes affect bass response that much ? Or does Bass response depend more on preamp tubes ?

Simply being nosey and trying to find some information.
Did you change tubes because they were worn out, or did you read a post and
spend some money just to try something different?
thanks
/cheers