vintageHIWATTconvention.com

Hello everyone, My name is Ken and my Hiwatt is a 76 DR103 that has been modded before I bought it in about 94.
I am going to give a try removing some mods on this amp. Mods include, preamp mod, footswitchable second channel,
effects loop and a line out. I'm not happy about the Brilliant channel sound at all. First I am taking out the preamp mod,
any advice will be helpful here. I have some moderate solder skills and am aware of the safety related to tube amps.

This is link to pic http://i960.photobucket.com/albums/ae83 ... c26f56.jpg

This mod adds more gain to Brill channel and would be the reason for bad sound? Or is it to do with the second channel added?

Thanks, Ken

hi Ken,

I think we'd need more pictures to fully evaluate things, but that picture looks like an OL-style gain mod, basically just adding an extra gain stage in the preamp.

--mark

Hi, more pics here http://s960.beta.photobucket.com/user/R ... 20DR%20103

Looks like it also has a footswitchable boost and an effects loop of some description.

--mark

Hi, can you look at this pic and tell me if it looks alright.

http://i960.photobucket.com/albums/ae83 ... 074b65.jpg

btw, I tried to get the pic to show up directly on this post without success

Wow, what a Frankenstien. It's hard to imagine anyone doing this kind of thing.

I think what you have described there is correct. I think you can remove that xicon 220k resistor on the preamp board as well.

I would gut all the added stuff and try to put it right........but that is me

Welcome to the Vintage HIWATT Forum.

Thanks

Ok, I will get to work on this, and yes you're right i will remove that 220 off the board.
Also when my Input jack and 1m resistor arrive by mail, I will change those and tackle
removing the rest of mods, to put er right

will have more questions later
thanks for the help,
Ken

You are welcome and good luck!
keep us updated!