Box of rock clone, volume problem

[ricci]

ricci, welcome: https://guitar-gear.ru/forum/topic/5...k/page__st__50

Thanks X-pro, I read but I also read a lot online about this pedal. There it is said that to increase the gain it would be enough to modify the bias by replacing the 1M R with 10M but the polarization resistors in the best performing model in front of me are all 1M, yet the impact is different, much stronger than mine. I assume that if I hadn't had the opportunity to compare, I certainly wouldn't have noticed anything because ultimately the pedal works well, albeit with a reduced punch.

[Helmholtz]

BTW, a buffer (or buffered bypass pedal) before the BOR should preserve the natural sound of the guitar and also increase gain.
I regret not having tried that myself.

[ricci]

I don't think it's a question of impedance, I'm using an A/B switch where I insert the two pedals A (mine) and B (the other), no pedal before and none after. I also took the point to point pcb again and the problem is still the volume gap. You can't even say that the components of B are different from those I use in A, because they are before my eyes and they are identical. And I would exclude the terrible quality of the board I used which has a very thin copper thickness, given that even in B the tracks are less than a mm wide.

[Helmholtz]

Any difference when swapping pedal A and pedal B positions?

[ricci]

none, I had already checked

[Helmholtz]

Whenever you get a chance, please try a buffer (or buffered bypass pedal like a Tubescreamer) in front of your BOR and let me know how it sounds.

[ricci]

I can already tell you now how it sounds with a Ts9 in front as a booster: it sounds amazing

[Helmholtz]

I can already tell you now how it sounds with a Ts9 in front as a booster: it sounds amazing

And with the TS 9 in bypass used as a buffer?

[ricci]

You lose a bit of high frequencies in the clean sound but it's not annoying, on the contrary in brilliant amps like the Fender it compensates and the sound is equally magnificent and the BOR darkens slightly but it is sufficient to raise the treble of the amplifier a little.

[Helmholtz]

You lose a bit of high frequencies in the clean sound but it's not annoying, on the contrary in brilliant amps like the Fender it compensates and the sound is equally magnificent and the BOR darkens slightly but it is sufficient to raise the treble of the amplifier a little.

An original TS-9 has an active buffered bypass.
Means that with effect off, the pedal acts a buffer having large input impedance and low output impedance, isolating the guitar from any following impedance and capacitance.
With a buffer between guitar and BOR the sound should be more brilliant and gain should be larger.
I think I might like that.

[ricci]

An original TS-9 has an active buffered bypass.
Means that with effect off, the pedal acts a buffer having large input impedance and low output impedance, isolating the guitar from any following impedance and capacitance.
With a buffer between guitar and BOR the sound should be more brilliant and gain should be larger.
I think I might like that.

Please excuse me, I understood without buffer.

I recently removed the 2n7000s and put in the bs170s and compared the voltages on both pedals, they are the same everywhere except on the tone pot. On mine the voltage on lugs 1-2 is about 4.3V and on lug 3 it is 3.8V while on the working clone the voltage is practically 0V on all 3 lugs of the tone.
Furthermore, on the negative of the 1uf cap, mine measures approximately 4.3V, on the other I read 0V.

[Helmholtz]

Means that the 1µ cap (C6) is leaky or has wrong polarity.
Probably also makes the tone pot noisy.

[ricci]

Vloss 0.6% and ESR 6Ω, anyhow i replaced it with a 47n and it does the same

[Helmholtz]

C6 is the only path how DCV could get on the tone pot.
So if you still get DCV there, you must have a wiring error.
I assume something is shorting C6.

[x-pro]

The bottom pin of R16 may not be connected to GND
or there's a bad GND wire on the part. For example, R13 R16 have no connection to GND