new f5 bias problem

[CanAm Man]

Originally Posted by komigenie

hmm, whats the value of this Capacitors on this red board ? 220/35 or something diferent .. i see ther 47/50 ...

what should be best value and what kind of cap ?

The caps on the red Jim's Audio PCBs are 47 mfd, 50 vdc. They are non-critical, and are in fact optional in the design. The Pass design does not use them.

[crazycody1993]

then i'll plan on getting a proper trafo, and should i wait until i get it together and running, to try anymore playing with the amplifiers?

[anhle]

It looks like the N channel irfp240 is gone - as you indicated the offset is -27V.

[crazycody1993]

i'm going to get the right transformer, and i'll have to get back to this once i caqn get it going, to see if my voltages being too high is the issue

[Nelson Pass]

Originally Posted by CanAm Man

The caps on the red Jim's Audio PCBs are 47 mfd, 50 vdc. They are non-critical, and are in fact optional in the design. The Pass design does not use them.

I presume that they tie to ground, otherwise oscillation is a real possibility.

If in doubt, try taking them out.

More poetry:

When Q4 goes
R14 blows

[crazycody1993]

yes, they do tie to ground.

as well as in that case! i'll be replacing Q4!

[crazycody1993]

Originally Posted by Nelson Pass

I presume that they tie to ground, otherwise oscillation is a real possibility.

If in doubt, try taking them out.

More poetry:

When Q4 goes
R14 blows

so if you dont mind me asking, if Q4 goes out, do i just have current flowing strait through it to R14? is that whats happening?