Fender Princeton ----> Twin

[The Dude]

I've seen this with a few pro players who have back up amps that may respond differently. They will find the spot where a backup amp(s) sounds the same as their main amp, and just use the knob set screws to rotate knobs to a position that "reads" the same. The "logic" is that every amp is set the same according to knob position and the player doesn't need to remember different settings for different amps to get the same sound.
A bit difficult to explain. I hope that makes sense.

[Chuck H]

There is MORE logic. More like nefarious plotting. A friend of mine a few years back asked me to reposition her knobs on the Bassman 100 she was playing through after the sound person at church kept asking where her Volume was at. So she asked me to reposition "7" at "4" so she could tell the sound guy & if he came to check, well, there ya go. Sneaky trick.

Jusrin

God I've missed you. This is classic Justin and I love it

[Chuck H]

I've seen this with a few pro players who have back up amps that may respond differently. They will find the spot where a backup amp(s) sounds the same as their main amp, and just use the knob set screws to rotate knobs to a position that "reads" the same. The "logic" is that every amp is set the same according to knob position and the player doesn't need to remember different settings for different amps to get the same sound.
A bit difficult to explain. I hope that makes sense.

The human condition is a funny (and sometimes "circumstance specific") thing. Your recognition is the exact reason I edited my post above. Being all aspergers and weird I sometimes miss the subtleties of cutural interaction as it works for others. Only as I age do I recognize the need to acknowledge this so I don't insult anyone

EDIT: Sometimes I actualy do manage to not offend anyone

[The Dude]

FWIW: Your post #3 was spot on. I would have liked it more than once, if possible. I was thinking exactly the same when I read the OP, but you beat me to a response and stated everything perfectly.

[g1]

How about some real expensive little "magic dot" stickers that the user can put on their controls to mark the settings.

[Helmholtz]

My friend does not want the amp to distort until 7 while playing his Jazzmaster through it.

What if I increase decreased the feedback resistor? The FB resistor on this amp is 2.2k as opposed to 820 ohms that I have seen on other Fender amps.

When at some vol. setting the amp starts break up/distort, this means that at signal peaks the max. clean power is exceeded.
As max. clean output is a hard limit (mainly depending on power tube plate and screen voltages), changing the NFB won't increase clean headroom.

[Axtman]

My friend and fellow amp tech told me that if I put a more sensitive speaker in the amp it may break up EARLIER rather than the later I was hoping to achieve. Is this correct.

BTW, while doing mods I will check the waveform with a scope and A/B the before and after.

[Helmholtz]

My friend and fellow amp tech told me that if I put a more sensitive speaker in the amp it may break up EARLIER rather than the later I was hoping to achieve. Is this correct.

No, a speaker with a higher sensitivity will not change the break-up point of the amp but will be louder.

[g1]

If he was talking about actual speaker breakup, that may be correct. This assumes that both speakers break up at the same SPL.
But I doubt it is speaker breakup that is the issue, more likely amp breakup.
So agree with Helmholtz, a more sensitive speaker will be louder at the point of amp breakup, which is what I think you want.

[Tom Phillips]

... even though zero and ten no longer line up...

And we must remember that the common Fender witch hat knob does not have a zero. However, I think many of us see it in our imagination.

[J M Fahey]

Funny thing is people buy and LOVE Princeton's *precisely* because they get crunch and sustain at a more manageable level.

Also some Guitar Gods prefer them for "recording* , for the same reason, a more relaxed experience at the Studio.

He's complaining at the main _feature_ this amp has.
Why did he buy this one in the first place?

Ok, if he has a "number fetish", you can add a resistive attenuator; 470k in series with volume pot, another 470k in parallel with it, it should roughly give him what he wants.

You may add a mini toggle switch by the volume control, setting attenuator in/out of circuit.
You can label it "clean/boost" if you wish.
Or add a pull switch volume control.

[The Dude]

Hi Juan! Good to see you back here!

[J M Fahey]

Gee, thanks.!,

[pdf64]

My friend does not want the amp to distort until 7 while playing his Jazzmaster through it.

What if I increase decreased the feedback resistor? The FB resistor on this amp is 2.2k as opposed to 820 ohms that I have seen on other Fender amps.

Schematic: PRINCETON_REVERB_bf_AB1270.pdf

Provided you / he understands that the amp won't actually be any louder at 7 than it used to be at 5, then yes, you could try reducing that resistor value.
820R may be a reduction too far, it could cause stability issues. As a first try, I suggest to try about halving it, eg 1k or 1k2.
Bear in mind that it might reduce the tremolo depth available.
And might change the tone a bit too.

Overall it may not be any more useful than plugging into the padded, lower gain input socket.

I thought of this recent thread, in which a Princeton Reverb build with an upgraded output transformer was too clean.
It's quite possible there were other reasons causing that.
https://el34world.com/Forum/index.php?topic=31600.0

[Helmholtz]

I thought of this recent thread, in which a Princeton Reverb build with an upgraded output transformer was too clean..

Was it ever confirmed that the OT made the difference?
If so, the "upgraded" OT might have lower impedance.