Jose Plexi mods

[Spencerleehorton]

Yeah I have a 250R 1w pot so I will try this and see if it improves a little

 

[Spencerleehorton]

I thought i had a 250 ohm 1 w pot but it was a 100R wirewound, ive added 47R to each leg and it does reduce hum a fair bit, only thing is its all over one side?
would i need to make the resistor bigger? 75 ohm on each side? or is it ok to have it turned all one way?

 

[Spencerleehorton]

I might remove the two 47R resistors and see if it improves

 

[Spencerleehorton]

the Humdinger doesnt really seem to do much with 100R pot, i'll wait for the 250R to arrive then try again.
Also looking at the OD channel to make it less lower mid heavy, ive installed the depth control now and this gives great control over the bass but the mids need a bit more help getting through so thats my next step.
going to look at byassing the2.2nf cap and listen to what influence it has, also the 1nf cap on the OD gain at switching this in and out at the moment does seem to do anything, so probably a mistake in wiring again.
Also going to look at cathode resistors and bypass caps.

 

[Spencerleehorton]

This next SLO-50 build will hopefully be much more accurate to the original.

 

[Alva Goldbook]

You should build a Fender Champ or 5e3 instead. The most common mistake made by new builders is building level 10 difficulty amps before they’ve mastered their skills well enough to execute it.

 

[Spencerleehorton]

Already built one Alva, sorry not everyone’s as good as you bud!! Merry Xmas, will get there one day!!

 

[Alva Goldbook]

You should build to match your skill level. Starting out I built perhaps 6-8 small single ended amps. I did this to improve my building skills and to test various circuit ideas like a different tone stack. I tried various construction styles to become a more well rounded builder. I build an amp in a hammond stomp box chassis to teach myself how to work in a limited space.

Simple circuits like these are great training exercises because any issues can only be a limited number of things. Correcting mistake means not adding a mistake on top of another one. One of the key skills you must master is how to solder and soldering neatly. Learning proper lead dress. Learning how to desolder something. Wires emit magnetic fields. This isn’t just about making things look pretty. It’s about making them function correctly.

All wires should be as short as possible.
No wire should touch each other.
A high current wire should be particularly isolated from a small signal, i.e. heaters and grid wires.
Alternating current wires should be neatly twisted.
If two wires must cross over each other, they should make a neat “+” shape to limit their interaction with one another.

Don’t rush your builds. Take your time. Savior the experience. It’s not good enough if it’s half right. The hardest thing to learn is to not rush. If it takes you an hour to solder a single resistor precisely right, then take an hour to do it.

 

[john12ax7]

This next SLO-50 build will hopefully be much more accurate to the original.

Chassis looks nice, did you make it?

 

[Spencerleehorton]

Chassis looks nice, did you make it?

No I bought the chassis