Quick question Fender TS

[catalin gramada]

Hello. Have a bassman on a bench with almost unusable scratchy pots. Have to replace 250k log bass pot but nothing at hand. I tried 250k lin but makes the bass control unusable. On other hand I have some 100k log I can use.
My question is: May I use 100k log bass pot instead original 250k log ? I don't see any diference as time the original was never used more than a quarter of its track as the owner said, but want to be sure please ? Thanks.

[Enzo]

Instead of asking us, you already have the part, so solder one in and find out if it works well or not. It certainly will cause no harm.

[Helmholtz]

Use Duncan's tone stack calculator to see the difference:

https://www.duncanamps.com/tsc/

[catalin gramada]

Instead of asking us, you already have the part, so solder one in and find out if it works well or not. It certainly will cause no harm.

Hey Enzo, I did it works, seems no diference between Chanel's, but is 23h00 I cannot crank it to see if really matter

[catalin gramada]

Use Duncan's tone stack calculator to see the difference:

https://www.duncanamps.com/tsc/

Hey Helm, I did it saw no differences, except some huge amount of bass, not usable anyhow

[vintagekiki]

Do not forget
One sound is in room, a completely different one on stage with all other performers.
From practice, 100k gives weak "thin" bass, which is lost on live music.

[catalin gramada]

Do not forget
One sound is in room, a completely different one on stage with all other performers.
From practice, 100k gives weak "thin" bass, which is lost on live music.

Hy VK, that I.m afraid but still seems it have enough balls even with 100k, too much in fact. I will pack it as it is, hope no complains, it is a cheap bassman 100 not a collector item. That I.m talking about, the fender practice is the key here , but the owner told me he did not used bass control past than #3 ever so 100k may fit his taste as well to do his current tone settings. 250k log get nominal 100k at almost end of the track position, never heard someone to use some amount of bass with a Fender but think Fender didn't put it 250k just because he did not had anything else at hand... Thanks.

[Leo_Gnardo]

Despite any opinions to the contrary, I would be perfectly happy to recommend the 100K log pot for bass control. In the Fender tone stack it's ordinarily used as a rheostat = variable resistor, iow only 2 terminals. The amount of bass proportional to the resistance selected, simple enough. True most folks - with any sense - don't spin the bass knob up very far. Excess bass eats up power, it's unnecessary, and makes tone flubby & woofy. Old sound engineer advice: the wider you open the window (bandwidth) the more crap flies in. IOW there's no need for excess bass. If your 100K bass control makes you happy, so be it. Keep that bass trim & tight. Also it has the advantage of spreading the useful control area over a wider turn of the potentiometer/rheostat. Gets my vote!

FWIW I've used 50K bass pots at times. Never a complaint. Plenty of oomph when turned way up, and tone doesn't sound thin & nasty at all. Well, unless the treble's cranked up and bright switch on. Maybe if you're using metal cone speakers especially 10's as well. IMHO bass guitar needs 15's, even 18's if you can deal with them.

[glebert]

You can add resistors to make a linear pot into a log pot. http://www.geofex.com/article_folder...s/potscret.htm

[christarak]

Hello. Have a bassman on a bench with almost unusable scratchy pots. Have to replace 250k log bass pot but nothing at hand. I tried 250k lin but makes the bass control unusable. On other hand I have some 100k log I can use.
My question is: May I use 100k log bass pot instead original 250k log ? I don't see any diference as time the original was never used more than a quarter of its track as the owner said, but want to be sure please ? Thanks.

If changing the pots doesn't work, check for leaking capacitors near the pot. This DC leaking from a previous stage can sometimes give the sound we interpret as a scratchy pot.

[pdf64]

You can add resistors to make a linear pot into a log pot. http://www.geofex.com/article_folder...s/potscret.htm

That’s a great article and has been very helpful to me, but regarding the taper thing, it’s looking at it from the perspective of output voltage / input voltage, it doesn’t look at frequency dependant aspects, doesn’t apply to variable resistors, as is the case here.
Also wouldn’t work for the pots used in tone controls such as tone stack treble, and James circuits.

From the Geofex page

there is no way to get a simulation of a log taper pot in the two terminal connection. For that we have to buy real audio taper pots

[J M Fahey]

You can add resistors to make a linear pot into a log pot. http://www.geofex.com/article_folder...s/potscret.htm

Sadly not here.

That cheap kludge only "works", sort of, in a passive Volume pot, and only if fed from a low source impedance which can drive the very low impedance you get on "10" because then the 250k track gets in parallel with the 22k to 47k "correcting" resistor.

In a tone Control itīs a mess.

There is a reason complicated and more expensive Log pots continue to be needed and made.

[vintagekiki]

There is a reason complicated and more expensive Log pots continue to be needed and made.

Nothing is accidental, There are parts "on kilogram" and expensive parts.
It has always been and will always be "how you paid, its you got ".

[J M Fahey]

Of course, pots of any kind donīt have much future

With everything digital, only encoders are needed (thereīs not even Audio voltages to control any more, but parameters) or at best "one size fits all" 5 k linear pots, to provide DC control between 0V and 5V

I feel like a friendīs Father: German born, suffered a lot in the War (Easter Front anybody?) , emigrated as fast as he could to Argentina, he was the last member of a LONG chain of Artisans specialized in making huge Church bells,learnt from his Father and the Guild where he was apprentice, all the way back to the 1200s or 1300s

NOBODY interested in learning and keeping that knowledge alive, so now itīs lost.

Oh well.

[catalin gramada]

Of course, pots of any kind donīt have much future

With everything digital, only encoders are needed (thereīs not even Audio voltages to control any more, but parameters) or at best "one size fits all" 5 k linear pots, to provide DC control between 0V and 5V

I feel like a friendīs Father: German born, suffered a lot in the War (Easter Front anybody?) , emigrated as fast as he could to Argentina, he was the last member of a LONG chain of Artisans specialized in making huge Church bells,learnt from his Father and the Guild where he was apprentice, all the way back to the 1200s or 1300s

NOBODY interested in learning and keeping that knowledge alive, so now itīs lost.

Oh well.

Well they know how to keep their craft secrets and takes with in graves. Reinvented the wheel is not quite simple task. The analogic circuits are history in our universities.