Adding switchable negative feedback to an amp that don't got none

[Wyatt]

One other question - do I need these resistors to be rated at a particular wattage or voltage or anything?

1/2 watt should be fine, IIRC it's what is stock in those.

 

[smurfco]

The final part should arrive today, so I will try to do this tonight. If I don't post tomorrow it's because I electrocuted myself and I am dead.

 

[Help!I'maRock!]

The final part should arrive today, so I will try to do this tonight. If I don't post tomorrow it's because I electrocuted myself and I am dead.

I claim the Hofner.

 

[Wyatt]

25 hours and counting.

I hope he led a good life.

 

[shoeless]

25 hours and counting.

I hope he led a good life.

I think HIAR is pulling for the Hofner.

 

[Chad]

Hopefully he doesn't sell the Duo Sonic before he gets fried. I claim that

 

[smurfco]

Still here, sorry to disappoint. The switch didn't show up yesterday - hopefully today it will...

 

[Chad]

Still here, sorry to disappoint. The switch didn't show up yesterday - hopefully today it will...

Awesome, there is still a chance

 

[smurfco]

It worked! The chassis metal is thick and I snapped one of my drill bits, and of course the bit went skittering off and fucked up the back panel. But other than that it was a fairly painless process, and the results are cool. I’m going to take it to a jam tomorrow and record with my zoom.

 

[shoeless]

It worked! The chassis metal is thick and I snapped one of my drill bits, and of course the bit went skittering off and fucked up the back panel. But other than that it was a fairly painless process, and the results are cool. I’m going to take it to a jam tomorrow and record with my zoom.

Awesome! Ya know, I kinda thought about changing the feedback resistor in my Twin, but never thought about making it switchable. That's a pretty cool mod.

 

[Chad]

Damn, no guitar for me.

Nice work. I’d love to see if I can hear a difference in it.

 

[Dudeman1967]

Any recorded evidence of this mod to share?

It’s so cool to see real, useful technical advice exchanged here.

 

[smurfco]

I will try and record an example to share. The problem is I am in an apartment and you can’t really get a good idea of the difference unless the amp is at least a little bit cranked. I will see if I can run it through my attenuator though.

 

[Shush]

Hi there sorry to bother you, how did this mod work out for you in the end?

I’m considering replacing the 47ohm resistor with a 100 ohm for a permanent change. Do you know if this would work?

Cheers