lets talk capacitor values ...

[MYLILSS]

i have my jsx apart, doing a few things to it. while searching the net i found a post on another forum where a guy mentioned making these changes and what they did for the sound of the amp....
changes:
C21 470nf => 1 ufd. Lets more low mid and bass through.
C3 1nfd => 2.2 nfd. Again lets more lower mids and bass through.
C8 470pfd => 2.2nfd ala Soldano. Really gets rid of the thin nasal tone. This is often changed on Marshalls as it is a treble peeking circuit.
C35 Remove, not present on the original Ultra design. C35 is a 10nfd cap which is really really small for this location. It basically makes the last triode stage act like a treble booster (Joe likes his treble) and it drops the volume. So the amp will be alittle louder and fuller.

will it matter exactly what type of capacitors i use ? as far as radial, axial, or ceramic disk etc. etc. ... i am good with a soldering iron, but not an electronic genius, so a little help would be much appreciated

 

[Anonymous]

did you ever figure this out?

 

[MYLILSS]

yeah, i just found the appropriate size caps in the same configuration as the originals, and everything worked out great.

 

[Anonymous]

ceramic ones?

 

[MYLILSS]

ceramic ones?

honestly i dont know. i found the coupling capacitors from valvestorm.com in the values i needed, so i went with those. they had all the proper ratings on them. they were the mojo dijon brand

 

[protoplasma]

Mallory 150 series or Sprague Orange Drop are likely what you're looking for. No need to spend a bunch of money for anything boutique. I definitely would not use ceramic....

Not sure if these links will work for you, but worth a shot.

http://www.mouser.com/Search/Refine.aspx?FS=TRUE&N=4294759263+254300+1323043
http://www.mouser.com/search/Refine.aspx?Ntt=Vishay/Sprague Polyester Orange Drop Capacitors

 

[MYLILSS]

Mallory 150 series or Sprague Orange Drop are likely what you're looking for. No need to spend a bunch of money for anything boutique. I definitely would not use ceramic....

Not sure if these links will work for you, but worth a shot.

http://www.mouser.com/Search/Refine.aspx?FS=TRUE&N=4294759263+254300+1323043
http://www.mouser.com/search/Refine.aspx?Ntt=Vishay/Sprague Polyester Orange Drop Capacitors

thanks for the info. i already have the appropriate values for the mods i wanna do to it, but they seem a bit large in size for the particular spot they are going in. i may look into getting those for comparison.

i am just trying to thicken up the tone and then figure where to start in order to tighten the amp up a bit more. not really in a hurry to do the mods, so i will give the site a look through.

thanks

 

[protoplasma]

Mallory 150 series or Sprague Orange Drop are likely what you're looking for. No need to spend a bunch of money for anything boutique. I definitely would not use ceramic....

Not sure if these links will work for you, but worth a shot.

http://www.mouser.com/Search/Refine.aspx?FS=TRUE&N=4294759263+254300+1323043
http://www.mouser.com/search/Refine.aspx?Ntt=Vishay/Sprague Polyester Orange Drop Capacitors

thanks for the info. i already have the appropriate values for the mods i wanna do to it, but they seem a bit large in size for the particular spot they are going in. i may look into getting those for comparison.

i am just trying to thicken up the tone and then figure where to start in order to tighten the amp up a bit more. not really in a hurry to do the mods, so i will give the site a look through.

thanks

No problem. Try not to get lost at Mouser, they have an incredible selection as they are a major supplier.

If you have and can send me the schematic I can make suggestions for mods...

 

[MYLILSS]

That would be awesome. I can get you one. Ill pm you once i get ahold of it. I think i have it stored on my computer somewhere