BYOC - CE2 - Why R1 Mod?

[LaloFP]

Hi friends!

Simple question that arises when I look at BYOCs CE2 chorus version:


I get why you would rise R2 from 470k(Boss CE2s original value) to 1M, to increase input impedance.

But why would you rise R1 from 1k(Boss CE2s original value) to 10k?

[antonis]

To get more signal attenuation..

[LaloFP]

But being R2 that big, going from 1k to 10k would be 1% gain reduction vs 0.1% gain (the original is 0.2%). Its a big difference only relatively (comparing 0.1 with 1) but in the whole, is 99% vol vs 99.9%. I suppose we cant hear that.

That's why i ask if is there another advantage of rising that R1.

[antonis]

That's why i ask if is there another advantage of rising that R1.

In theory, the larger the R1 the less prone the Q1 to oscillations..
(it works as "base stopper" resistor..)

IMHO, a much lower value (2k7 say) should be fine..

[PRR]

Probably to reduce the radio interference. Fender used 34k at that place with tubes. If you don't have broadcast/CB/police radio waves in your air, it does not matter; if you DO, then you need a stopper and maybe more rather than less.

It may have been fine back in the lab but not in the downtown dive on a Saturday night.

[LaloFP]

Thank you antonis and paul!! Now I know