National NC-183 Question

[W7POW]

I am currently replacing the caps in my newly aquired NC-183 and noticed some clipped off leads like there was maybe a mica cap across L-29 the filter choke.  I looked at the schematic and saw no cap for this in the parts list.  I googled the reciever on-line and looked at pictures of other and noticed some sets seem to have a cap in this position and mine obviously did at one time as well.  Should I replace one in this position and if so what is the value.

Thanks,
Chris.

[w3jn]

Should be a .1 uF/400V.  Probably would work fine without it.

[K3ZS]

If you have not done it yet, check all the resistors too.    On my NC-183 most of them were way off.

[W7POW]

Thanks for the tips.  The NC183 is finished as far as replacing the capacitors go and I fired it up for a couple hours yesterday and everything seems to work fine minus the meter is not moving.  The performance seems good but I think today I will start checking out the resistors.  Anyone have an exact value for the mica cap that goes accross L29?  Thanks again.
Chris

[w3jn]

 
As I stated in my post, it's .1/400V.  Not a mica, it's a paper wax.

[The Slab Bacon]

If you have not done it yet, check all the resistors too.    On my NC-183 most of them were way off.

God... we have already beat that one to death

Check all of the 47K screen dropping resistors.

I dont know why, but, Nationals from that era are notorious for crapped out or way way out of tollerance resistors. I guess they just used cheap, crappy resistors. Every national I've had or worked on needed a bunch of resistors replaced.

Also, remember if you're using the S meter to peak up the IFs tune the signal Ifs for maximum deflection, then tune the AGC IFs for minimum deflection (lowest reading)

                                                                 the Slab Bacon

[KM1H]

Its not only National, they all shopped price and often used the same resistors. I find the same problem in Hammarlund, Hallicrafters and even Collins. I dont have the oddball brands such as RME to compare.

Carl