Hammond 290-series Guitar amp PTs

[prosounddaryl]

Hi Daryl

I believe you did not see post-13? I think I posted it while you were making up your post. If you review that post, I suggested that changing the feedback values may have little benefit in this specific amp, but did suggest a different mod. Really, you need to say how the sound seems to you now and what you would like it to actually sound like, if it needs to change.

Yes, the images of the manual look wonky but at least you can read the values and part names. The PDFs I have for your amp are practically illegible.

The schematic is akin to reading music on a staff as both are abstract. The layout drawing is like reading tablature, which shows how to position your fingers on a fret board. The best way to learn how to read a schematic is to first have a resource of schematic symbols, then to look at a physical circuit while looking at the schematic. This is easier to do on a simple hand-wired circuit than with a PCB amp as it is easier to see what connects to what.

Like most things, you do not have to know everything about the subject to be successful or to make a living from it.

Have fun

Thanks for that. I have let the amp sit for close to a month, as I was expecting I might want to work on this amp, and wanted to make certain the caps had time to discharge.

I think want I am going to do at this point is fire it up and play it for a few days, and that way identify exactly what the mods are that I want. 


You are correct, I did not see post 13, and now that I have, I'll give the amp a more thorough listen. If that's a tweed circuit there should be no reason I can't get a great sound out of it when using your preamp.