air king 325B

[bob91343]

I only looked up the 2N261 and it's a PNP germanium power transistor. You are going to have fun replacing any of those but with luck you won't have to.

Almost for sure that big capacitor is toast. Replace it and see what happens.

[insurone]

Hope these a helpful. Is there a place I could send this to get it up and going again, without it costing an arm and leg to get it down??

[insurone]

I was thinking it was the big capacitor, but I'm not seeing any markings on it to let me know what it is, reason I was looking for a wiring diagram or one close to it.

[insurone]

here's what I think is written on the capacitor
927-1974
2000 MFD 20 VDC
2406323

Know where I can find one of these??

[bob91343]

Okay so you need at least 2000 MFD at 20V or more. Easy to find. Try Google or even go to Digi-Key or Mouser etc.

[insurone]

I found a 2000 MFD at 50 VDC, not finding a 20 VDC, how about one that is 25V found one of those, its all metal on the outside, the old one has cardboard wrapping around it, does the metal one need to be insulated for mounting??
As you have probably notice, I'm really out in left field on this stuff.

[Electronic M]

Rule #1 in replacing capacitors you can always use one with a higher voltage rating as a replacement.
Rule #2 Electrolytic capacitors are polarized meaning if you connect them backwards...BOOM!.
Rule #3 most Electrolytics can be replaced with another lytic that is within 20% of the value of the original....So the 2200uf 50V caps at ratshack will work.

Some of those black caps in your first picture may also be bad. If you have no sound try jumping a new cap of almost any value across each of them in turn, and see if you get any sound. If the sound comes in at all replace the one that jumping caused the sound return with a reasonable replacement.

[bob91343]

Yes either of those will do the job. And yes, you need to insulate but you can use tape (make it two layers to be sure) or nearly anything insulating.

Since that unit uses PNP transistors, I suspect the power supply is negative, and that usually means the metal can of the capacitor is at power supply potential and needs to be insulated.

[insurone]

Thanks, I will order the cap and give it a try and go from there. Again thanks, will keep you posted on the progress.

[toxcrusadr]

While you're ordering, I would replace any other caps (such as those black ones) that you can read the values off of. They will not be expensive to buy, so if you want to order all of them and replace only what's shot, you can do that.

[insurone]

I had already ordered the 2000 mfd, before I read your post, I received it yesterday and replaced the old cap with new cap. Still have the same hum. I think I posted the hum will get louder with the increase of the volume control. On my way to Radio Shack to get replacements for the black caps, hoping this will take care of it.

[insurone]

That was a wasted trip to RadioShack, Very poor selection of caps. Onto the internet.

[insurone]

Ok, I'm surfing the net for caps, not sure what to look for. You said to replace all the black caps, so I'm looking for 50 MFD 10v, 10 MFD 6v, 5 MFD 6V, .05 MFD 600 VDC, to many types of caps. polarized, non-polarized, etc.

[insurone]

Not having much luck on locating the caps, as not sure what type I'm suppose to be looking for, here's what I need, 50 MFD 10 VDC, 10 MFD 6 VDC, 5 MFD 6 VDC, .05 MFD 600 VDC,
What can be substituted such as 50 MFD 150 VDC?

[Electronic M]

That could work, but a lower voltage 47MFD cap would be cheaper. If you search 4.7 and .047 you'll get many more hits.