Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: KimboDb on November 13, 2017, 02:49:57 pm

Title: Effects loop for Hoffman Ab763 one channel
Post by: KimboDb on November 13, 2017, 02:49:57 pm

hello, I'm interested in the adding an effects loop to my amp. Is this feasible for my hoffman amp also, Is it a difficult add-on. The amp already built and has been used for a month now. If it is not to hard and doable, were would i start. Thanks ahead of time for the responds.

Title: Re: Effects loop for Hoffman Ab763 one channel
Post by: guitardude57 on November 13, 2017, 03:26:49 pm

There are modular FX loops that are easy to add on.
Solid State.


If you have an extra tube, you can build a Dumble type FX loop with
a send and return level pos... if you so wish.


I built a Dumble out of a Bassman 70, and had the extra tube there to use.

Title: Re: Effects loop for Hoffman Ab763 one channel
Post by: 2deaf on November 14, 2017, 12:08:35 am

Lots of things could be done.  Here is one idea.  Unity gain with equal signal at Send and Return.

Title: Re: Effects loop for Hoffman Ab763 one channel
Post by: Ed_Chambley on November 14, 2017, 06:58:33 am

Quote from: guitardude57 on November 13, 2017, 03:26:49 pm

There are modular FX loops that are easy to add on.
Solid State.


If you have an extra tube, you can build a Dumble type FX loop with
a send and return level pos... if you so wish.


I built a Dumble out of a Bassman 70, and had the extra tube there to use.

Do you have the schematic for this

Title: Re: Effects loop for Hoffman Ab763 one channel
Post by: tubenit on November 14, 2017, 01:01:26 pm

Here is a thread in ARCHIVES with numerous FX loop designs.  The dumblish ones are posts #13 and #14.

With respect, Tubenit