LNFB mod question...

[mcinku]

I just wired a LNFB switch just to see how it sounds like but man I must be deaf. OK my ears are probably not the most sensitive thing out there but I think this LNFB is so subtle it's probably not worth the trouble.

...or maybe I did this wrong somehow


So here's my layout if somebody cares to look at it.

[greiswig]

I have mine on a switch, too, and I can pretty clearly hear (and feel) the difference between 22M, 44M, and 66M of resistance in series. Check your wiring again.

[mcinku]

I have mine on a switch, too, and I can pretty clearly hear (and feel) the difference between 22M, 44M, and 66M of resistance in series. Check your wiring again.

Man, so you can hear the different resistance and I can't hear the on - off switch. Something is wrong here. I measured the switch and it's working fine.
BTW I used shielded wire just in case but that can't be the issue.

[Guitarman18]

mcinku wrote:

I just wired a LNFB switch just to see how it sounds like but man I must be deaf. OK my ears are probably not the most sensitive thing out there but I think this LNFB is so subtle it's probably not worth the trouble.

It becomes more noticeable when in OD mode, if the CL volume is high.

Try clean vol on max, whilst in OD and switch LNFB in and out. There is a distinct change from smooth to raw. This is not a recommended setting by any means but it does highlight the effect. If you don't hear any change, check your wiring.

Hope this helps.

Cheers, Paul.

[greiswig]

I have mine on a switch, too, and I can pretty clearly hear (and feel) the difference between 22M, 44M, and 66M of resistance in series. Check your wiring again.

Man, so you can hear the different resistance and I can't hear the on - off switch. Something is wrong here. I measured the switch and it's working fine.
BTW I used shielded wire just in case but that can't be the issue.

I didn't use shielded (keep the leads short), but Paul raised a good point...the effect is stronger when more gain is on CL1. I run my volume up around 1-2 o'clock. On the clean side, no LNFB should sound a bit more "fendery" or loose. On the OD side, without it it sounds less like the Dumble overdrive, not as tight. It also changes the way it feels, too...spongier?

[mcinku]

Hmmm, will try more gain on V1 and see if I can spot something there.

Thanks

[Guitarman18]

BTW I used shielded wire just in case but that can't be the issue.

Be careful to only use the prescibed 6 runs of shielded cable in your build, otherwise it can give you more problems than it solves. On the LNFB I can't imagine it will make any difference though. If your lead dress matches the well documented examples (ie. #124 etc) then these amps are killer quiet, particularly on the clean channel.

Cheers,

Paul.

[talbany]

If your lead dress matches the well documented examples (ie. #124 etc) then these amps are killer quiet, particularly on the clean channel.

Totally agree!!.. I use to star ground everything in 2 spots...(Transformer bolts) and preamp (down by the input jack)..Most of these builds came out pretty quiet...I would get some idle noise and some noise with the amp pegged... Although wer'e talking very little and well within my noise ordnance!!.. On one build about a year I thought I would follow the Dumble method...
The clean channel was dead corpse quiet...so quiet when I fired up the amp for the first time I thought great what did I forget... Started checking voltages and found the amp worked fine.. and this was on a steel chassis...
Try to fly all the AC keep the layout clean and the lead dress neat..You shouldn't even need shielded wire from the Master volume to the break the chain loop and back to the PI.. No shielded wire here really makes a big difference..Couldn't believe how quiet this amp was even with an external loop.... Especially the clean channel.. dead quiet..

Tony VVT

[Ed de Jager]

Mine is dead quiet too,ánd i can hear the difference between with lnfb and without.Without it,it is louder too.Maybe you can hear that Mcinku?

[roknroll]

Definite difference between LNFB in and out of the circuit. In is cleaner in both clean and od mode. Out is looser. As well there is a slight tone change.
JK

[mcinku]

Mine is dead quiet too,ánd i can hear the difference between with lnfb and without.Without it,it is louder too.Maybe you can hear that Mcinku?

I tried it today, with more gain and man I must be deaf.
For now I'm leaving it as is but if I find something more useful to put on that switch, I'm changing it.

[Ed de Jager]

FWIW,i never use the amp with the volume below 12 o`clock.
Master depends on how loud they let me play.

Ed

[Bob-I]

I tried it today, with more gain and man I must be deaf.
For now I'm leaving it as is but if I find something more useful to put on that switch, I'm changing it.

It woulds to me like something is wrong. At the very least you should hear a slight volume drop. I agree that the tonal change is subtle but the volume change is noticable.

[mcinku]

Maybe you can spot something.