Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Oddvar on October 04, 2016, 04:38:48 am

Title: Altering trble in Hoffman Stout build...
Post by: Oddvar on October 04, 2016, 04:38:48 am

Hia all.  I have just finished the Hoffman Stoutbuild.  Great amp, allthough I feel I might wanna tame the treble a bit.  It has a very clear boost in what I hear as 2000-2500 hz.  I have changed to different tubes and different speakers, but it's always ther.  Any suggestions on how to try and tame this?

Title: Re: Altering trble in Hoffman Stout build...
Post by: sluckey on October 04, 2016, 05:26:36 am

The Vox style "CUT" control does a pretty good job. It consists of a 250KA pot and a .005µF cap. Easy to temporarily install to see if it works for you. If you like it, you could just install the pot on the front panel, or if you don't want the pot, just set the pot to the position you like. Then measure it's resistance and replace with a fixed resistor.

Look at this schematic for more info...

     http://sluckeyamps.com/dual_lite/dual_lite.pdf (http://sluckeyamps.com/dual_lite/dual_lite.pdf)

Title: Re: Altering trble in Hoffman Stout build...
Post by: tubenit on October 04, 2016, 05:30:40 am

Just another few suggestions to consider.  I strongly suggest trying the "enhance cap" safely using insulated alligator clipped wires.  IF you like the way it sounds ............ solder it in.  Same thing with the smoothing cap.

With respect, Tubenit

Title: Re: Altering trble in Hoffman Stout build...
Post by: Oddvar on October 04, 2016, 12:57:08 pm

Hi.  I tried the suggestion from you Tubenit.  Sounded a bit more Marshally.  I would love to try Sluckeys as well, but didn't get where to install the pot?

Title: Re: Altering treble in Hoffman Stout build...
Post by: sluckey on October 04, 2016, 01:34:04 pm

I assume you used Hoffman's layout? If so...