I bought an Antek AN-4218 for my F5 a while ago and after building and rebuilding my amp I finally got it how I want it. I just have one problem, the transformer developed a mechanical buzz. I can't feel the buzz in the transformer but I can hear it. I have the amp biased at .61 and temps are in acceptable range. There are no other problems with the amp and I am very happy with the sound. Is there anything I can do about this or do I just need to order another one? Is 400VA to small?
It looks as if it's allready there... How about reversing the polarity of one of the toroids?
Best Regards...
Best Regards...
I have 6 X 33,00uf total in a clc configuration.
33kuF-33kuF-2mH inductor (don't remember eaxactly if that is value but it's close)-33kuF
I have rubber underneath the torroid and under the mounting plate. The buzz if faint but I can hear it because it resonates in the enclosure.
No dimable lights on this circuit but I could try connecting it to another outlet and see what happens.
33kuF-33kuF-2mH inductor (don't remember eaxactly if that is value but it's close)-33kuF
I have rubber underneath the torroid and under the mounting plate. The buzz if faint but I can hear it because it resonates in the enclosure.
No dimable lights on this circuit but I could try connecting it to another outlet and see what happens.
better 33mF-2mH-(33+33)mF
if case is resonating , you need softer mounting
look at picture I posted
if case is resonating , you need softer mounting
look at picture I posted
Thanks Zen, it is the hollow space that is resonating, not the case itself. I will try a softer mounting before I do anything else.
i 've killed the f***in' ground loop
it took me quite a while to understand the internal ground loop
in my f5; but finally, (with a friends help) i got rid of it!
the signal wire is now led very very tight to the (dc-power/audioground) cabel tree from the plug 'til f5 boards.
no more hum no matter what source.
great amplifier!
thanks to nelson and you all
it took me quite a while to understand the internal ground loop
in my f5; but finally, (with a friends help) i got rid of it!
the signal wire is now led very very tight to the (dc-power/audioground) cabel tree from the plug 'til f5 boards.
no more hum no matter what source.
great amplifier!
thanks to nelson and you all
With the power off and P1 & P2 set to maximum, you should get a reading of approx 1K7 across R3 & R4, if you have, your JFETs are probably duff, the only way to find out is to remove them and check their IDSS.
maximum resistance.
Whatever direction achieves maximum resistance, the opposite to where you set it for first power up.
Whatever direction achieves maximum resistance, the opposite to where you set it for first power up.