Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Parasitics in 89B Receiver
#1

I have the 89B 123 with the 77 detector.  I had to rewind the oscillator coil as in many other sets and all is working and about to package it up and call it fixed when lo and behold I find a parasitic.  The set is self oscillation on 600 khz and there is a station in this market on that channel.  So out come the bypass cap and see if I can place it across something that will stop the parasitic.  Just wonder if any others have seen this.

Stan Adams
Memphis Icon_e_surprised  Icon_e_surprised

Edit: Model number corrected.
#2

Maybe a few drops of Frontline or Advantage, take care of those nasty critters. Icon_lol

"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
#3

yea buddy, if you have ever spent a night in a cold transmitter building trying to get birdies out of a broadcast transmitter, now that is some fun!!! Napalm might work better.
#4

Hi Stan
Couldn't find any info on your set unless it is a battery job??
Terry
#5

89B is 34 Tombstone, I had birdies in the first RF Amp-1st Detector/Mixer, just backed the gain down a bit.
#6

Methinks you mean a model 19. Well you could have taken it to France to be with all to other Parisasites.
GL OM
Terry




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM
Philco 42-345 Restoration/Repair
Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM
Philco model 38 code 121 not receiving signal.
Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM
Testing a speaker and output transformer Trutone A2-G
The equivalent of one short turn is basically the same as that of a shorted load. If it is the primary's turn, then the ...morzh — 03:53 PM
Testing a speaker and output transformer Trutone A2-G
I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM
Philco model 38 code 121 not receiving signal.
As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM
Philco model 38 code 121 not receiving signal.
Well why not! :lol:Stormlord5500 — 03:14 PM
Philco model 38 code 121 not receiving signal.
Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM
Testing a speaker and output transformer Trutone A2-G
morzh Short-circuited turns can be considered as a half-dead transformer. But on this case transformer will hot and s...Vlad95 — 11:01 AM
Testing a speaker and output transformer Trutone A2-G
I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM

[-]
Who's Online
There are currently 2218 online users. [Complete List]
» 2 Member(s) | 2216 Guest(s)
AvatarAvatar

>