Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TurboGuitarMelton on March 22, 2012, 01:10:02 pm

Title: Tweaking my amp for more Low-Mids
Post by: TurboGuitarMelton on March 22, 2012, 01:10:02 pm: Hey guys I have a Laney TT100H and i was wondering what i could do to tweak the electronics to give more low-mids in my sound? :think1:

Here is the schematic diagram! its also attached to the post.

http://musickoncept.free.fr/Pdf/Audio%20-%20Amplifier%20-%20Guitar%20-%20Laney%20Schematics%20Tt100H.pdf (http://musickoncept.free.fr/Pdf/Audio%20-%20Amplifier%20-%20Guitar%20-%20Laney%20Schematics%20Tt100H.pdf)

Any help would REALLY be appreciated!
Thaanks,
Daniel
Title: Re: Tweaking my amp for more Low-Mids
Post by: jjasilli on March 22, 2012, 01:43:02 pm: In which of the 3 channels do you want more mids? E.g.: Channel A (FMV), things to try: decrease slope resistor R1 to 68K or 51K; increase treble cap C1 to 300pF or 500pF; increase mid pot to 50K.
Title: Re: Tweaking my amp for more Low-Mids
Post by: TurboGuitarMelton on March 22, 2012, 02:23:51 pm: I was wanting to do the third channel(C). Which cap/resistors specifically in channel three(C) would i need to change the values of? Also which one do you think would have the greatest effect? Thanks for the help! I'm fairly new to this stuff.
Title: Re: Tweaking my amp for more Low-Mids
Post by: jojokeo on March 22, 2012, 03:44:34 pm: Quote from: TurboGuitarMelton on March 22, 2012, 02:23:51 pm
I was wanting to do the third channel(C). Which cap/resistors specifically in channel three(C) would i need to change the values of? Also which one do you think would have the greatest effect? Thanks for the help! I'm fairly new to this stuff.
Increase C8/22n which is .022uF/400v to .047uf/400V which is also 47n/400v. This will give you more bass to dial in which will also affect your low mids on your bass & mid pots when you dial things in.

Next is to directly increase the overall available mids by increasing the midrange potentiometer VR10 which is a 22k linear pot to a 50k linear pot. !00k can be used if that's all you have but will not be all that much more mids that you'll get over the 50k one.

3rd & last thing if you still feel something even more is necessary/wanted is to increase the C9 22n/400 cap like the other using a 47n/.047uF cap here.
Title: Re: Tweaking my amp for more Low-Mids
Post by: TurboGuitarMelton on March 22, 2012, 04:20:05 pm: Thank you guys so much! Ill let you know how it turns out when i do it!
Title: Re: Tweaking my amp for more Low-Mids
Post by: Colas LeGrippa on March 22, 2012, 07:01:57 pm: even if you change a cap to a lower value, it won't remove highs, it will give you more bottom end and mayl affect the balance of the amp, sometimes leaving a ''hole'' in the frequency spectrum: lots of highs, lots of bottom, lack of mids
Title: Re: Tweaking my amp for more Low-Mids
Post by: The_Gaz on March 23, 2012, 01:08:19 am: First thing I'd do is reduce C9 (mid cap) to 15n, which will technically increase low mids. Easy to see on TSC.