HT5-R combo possible stress...
Hi , through this good forum I've got useful suggestions about the speaker swap . But I' like also reduce the exxagerated amount of gain ,not so easily manageable...so , conscious of the possible risks in terms of tone and sound , I'd like to try to replace the stock preamp tube with a less-gained 12AU7 ( eventually , since it doesn't requires biasing , I can give up...) . I just like to know if this change can really , sooner or later , stress the amp or/and the tubes or require more periodic biasing work . Thank you !
- thephantum
- Posts: 1160
- Joined: Wed Jan 29, 2014 7:42 pm
- Location: Virginia, United States
There's no danger to the amp by replacing the 12AX7 with a 12AU7 and it will reduce the gain by a lot. On a scale of 1 to 10, if the 12AX7 has a gain factor of 10, the 12AU7 is about a 2. So you might want to look at something like a 5751 first, which would be around a 7 and makes the gain knob much more usable.
However, in the experiences I've had with my own HT5, replacing that tube with anything other than a 12AX7 caused the amp to lose all of it's edge. It sounded flat and lifeless...at least to my ears.
However, in the experiences I've had with my own HT5, replacing that tube with anything other than a 12AX7 caused the amp to lose all of it's edge. It sounded flat and lifeless...at least to my ears.
I'm grateful to you ,thephantum, for your reply . But at this point ,I MUST someway understand the reason of that harsh and gritty tone ; so , since I've replaced the stock Blackbird and the preamp tube also with a better one (same type) , I guess all I can do is : 1- try a smoother and fatter cone as a Greenback ; 2- if it's not enough, risk with another preamp tube with less gain , and see the results...maybe it's 'better' some flattness than a pretty useless 'gain' that now I have ...for this reason , I'm going mad through pedals... 3 -try with a ever more less-gain preamp tube as 12AU7 ; sometimes it seems someone has fixed this kind of problem
- thephantum
- Posts: 1160
- Joined: Wed Jan 29, 2014 7:42 pm
- Location: Virginia, United States
Like I said, I would not just jump all the way down to a 12AU7, as the amp will lose too much gain. I would try a 5751 first, then a 12AT7, then a 12AY7. If all of those still have too much gain for you (very doubtful), then try a 12AU7.
Just my $0.02
Just my $0.02
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