Marshall heads

[Trimbert]

#12
Yesterday, 11:27 PM
Hi fellas… I’m new here and pretty much new to tube amps. Definitely new to attempting to work on them , I have a Marshall ma100h yep the cheap one , it’s actually a nice sounding one I think .. I have no clean channeis one problem and the other one is no in and out ( leads ) coming out of the reverb tank .
Furthermore I can’t find a decent schematic for it .. I have th chassis pulled and right away I can see that there are 3 two pin and a three pin .. post with no plug going two them .. sorry about my terminology guys bear with me .. they are labeled con 17 and 18 do you guys have any idea what they are for .. con 7 is the other zz0.n9jz0r14fvkzz

[nosaj]

marshall_ma100_ma50_sch.pdf


con18 Con19 reverb
Con7 Bias test point

nosaj

[g1]

Schematic attached. Read up about safety concerns and discharging filter capacitors for tube amps before you do anything.
Con7 is test points for bias settings. Con18 goes to tank input, Con19 to tank output.
(edit: looks like nosaj beat me to the button)

Oh, and welcome aboard.

[Trimbert]

Man you guys are awesome thank you , I totally understand those caps and that’s DC voltage is especially dangerous and I thank you for the heads (pun intended ) up !

[Trimbert]

So for some reason it won’t let me view the file .. says invalid file specified … im on my phone should I try from my labtop?

[Jon Snell]

So for some reason it won’t let me view the file .. says invalid file specified … im on my phone should I try from my labtop?

Try this;
https://elektrotanya.com/marshall_ma...wnload.html#dl

[g1]

So for some reason it won’t let me view the file .. says invalid file specified … im on my phone should I try from my labtop?

Should work now.

[nosaj]

So for some reason it won’t let me view the file .. says invalid file specified … im on my phone should I try from my labtop?

If you don't have an app that reads pdf's thats the error you get.
nosaj

[g1]

If you don't have an app that reads pdf's thats the error you get.
nosaj

That was my upload that gave the 'invalid attachment' message. I fixed the link. Your attachment worked, I should have just deleted mine when I saw yours there.