Replacing arcade monitor capacitors - recap

[monkeykong]

Hello peeps, I'm wanting to replace the capacitors on my CRT arcade monitor in hopes to get more punch/brightness out of the picture.

My question is other than matching uF and voltage should I pick capacitors with comparatively higher lifetime hours and at least a 105°C Operating Temperature? Should I concern myself with Ripple Current spec?

[stj]

Re: Replacing arcade monitor capacitors - recap

what monitor is it?

[monkeykong]

Re: Replacing arcade monitor capacitors - recap

what monitor is it?

Hi, its a Hantarex MTC9000A, I do have a capacitor list from a another forum.

[stj]

Re: Replacing arcade monitor capacitors - recap

use high temperature parts in that.
like panasonic NHG

and inspect all the soldering - including under the edge of the metal frame overhang.

[kc8adu]

Re: Replacing arcade monitor capacitors - recap

cant hurt to recap but its probably a soft crt.arcade crt's usually have a million hours on them.
if b+ is low heaters will be too.but to be that low you would also have 4 sided shrink too.
iirc those have a 270k resistor that when it opens pulls g1 negative.part of the abl.
its near the fly.will be black till you crank up g2.

[stj]

Re: Replacing arcade monitor capacitors - recap

might sound stupid, but have you cleaned the front of the tube?
they build up a layer of very fine black dust like a tint.

[monkeykong]

Re: Replacing arcade monitor capacitors - recap

use high temperature parts in that.
like panasonic NHG

and inspect all the soldering - including under the edge of the metal frame overhang.

So taking a 1uF 250V for example (two of to be replaced for this chassis), if I cant get the Panasonic below then the Nichicon is a good choice and maybe preferable based on spec?

Panasonic (NHG) ECA-2EHG010I lifetime temp 2000 Hrs @ 105°C

Nichicon UPM2E010MPD1TD lifetime temp 3000 Hrs @ 105°C

Also I take it its worth taking the time to measure the original Lead/wire spacing distance and choosing capacitors that match closely?

might sound stupid, but have you cleaned the front of the tube?
they build up a layer of very fine black dust like a tint.

The glass has already been cleaned ; )

@kc8adu thanks for responding though I'll have to decode your message further as my electronics knowledge is very basic.

[stj]

Re: Replacing arcade monitor capacitors - recap

lead pitch normally only matters on larger caps,
but given modern caps are smaller, you will have to do some leg bending anyway.

[monkeykong]

Re: Replacing arcade monitor capacitors - recap

I also have one other CRT arcade monitor a Kortek KTH-F and I've just complied a capacitor list for that (Samyoung SMS & SM series).

My only reservation now when selecting replacement capacitors is the ripple current spec, the quote below is from another forum

"Try to get capacitors with similar ESR and ripple current ratings as well. Many people think the lower the ESR, the better, but many TV circuits will be unstable if the ESR is too low."

Please advise?

[stj]

Re: Replacing arcade monitor capacitors - recap

higher ripple handling is fine, lower is bad