I noticed that there is a trimmer or padder cap mounted on the right side of the chassis that was all covered in dust and all oily. (maybe the oil was supposed to be there?!!)
But I though it should be cleaned....so I tried to spray contact cleaner to help wash out the oil. Then I actually took it apart and now it is hopelesly destroyed...
.. and damaged beyond hope.
I cannot determine what value it is or what it should be.
I want to replace it. But I don't know the proper value or where to get it if I knew. lol
Facing the front...I am looking at the right side of the chassis. A right side view has two larger holes next to each other there for access to trimmer caps "f" and "k" .
The schematic shows holes for these 2 trimmers on that side mounted on a strip inside. But this one cap that I am seeking ID for is screwed to the chassis and mounted near the other two but higher and to the left. One side to the chassis the other end connects to a contact on the band switch.
It is a sandwich type of capacitor about a 1/2inch x 1/2 inch and about a 1/4 inch thick. It is made of many layers separated by mica sheets.
I can locate most all other trimmers in the schematic but not this one. The schematic shows several trimmer caps listed in the parts list but it does not say the actual value of these. Just says "compensating condenser" or "trimmer condenser"
I think it may be the variable cap shown on the schematic in the area of C8 and C7 looks like a number "3" or a letter "j" but not sure. It does have a Zenith part number stamped on the bottom part of it 22-563c.
The only part with that number is C8.
So perhps it is C8 which is listed as a "fixed padder"
But what is the value??
And/or where can I get a replacement?
Any help is greatly apreciated.
thanks
Peter
pbpix@optonline.net
I note that C7 is also some kind of adjustable. It is called a "compensating condenser" and is drawn with 2 wavy lines. I'm not sure what that means. You will have to trace the circuit, identifying each of those parts to be sure which is which.
The gunk on the cap might have been a factory sealer. If you can find a similar trimmer, with about the same number of layers, you might be able to fiddle with it until the alignment works.
Maybe the cap was C10, in the lower left by all those coils. It goes to the band switch also.
Tony
:Can anyone please help me identify the value of a component on this radio?
:I have a Zenith 5s319 that was recently acquired. Very nice but the shortwave band is not tuned properly and is way off.
:It doesn't have sensitivity to actual on air signals or so it seems and when my signal generator is set for 21mhz it comes in on 18mhz. The SW local oscillator also seems to quit when I try to tune the dial below 10mhz.
:
:I noticed that there is a trimmer or padder cap mounted on the right side of the chassis that was all covered in dust and all oily. (maybe the oil was supposed to be there?!!)
:But I though it should be cleaned....so I tried to spray contact cleaner to help wash out the oil. Then I actually took it apart and now it is hopelesly destroyed...
:.. and damaged beyond hope.
:I cannot determine what value it is or what it should be.
:I want to replace it. But I don't know the proper value or where to get it if I knew. lol
:Facing the front...I am looking at the right side of the chassis. A right side view has two larger holes next to each other there for access to trimmer caps "f" and "k" .
:The schematic shows holes for these 2 trimmers on that side mounted on a strip inside. But this one cap that I am seeking ID for is screwed to the chassis and mounted near the other two but higher and to the left. One side to the chassis the other end connects to a contact on the band switch.
:It is a sandwich type of capacitor about a 1/2inch x 1/2 inch and about a 1/4 inch thick. It is made of many layers separated by mica sheets.
:I can locate most all other trimmers in the schematic but not this one. The schematic shows several trimmer caps listed in the parts list but it does not say the actual value of these. Just says "compensating condenser" or "trimmer condenser"
:I think it may be the variable cap shown on the schematic in the area of C8 and C7 looks like a number "3" or a letter "j" but not sure. It does have a Zenith part number stamped on the bottom part of it 22-563c.
:The only part with that number is C8.
:So perhps it is C8 which is listed as a "fixed padder"
:But what is the value??
:And/or where can I get a replacement?
:Any help is greatly apreciated.
:thanks
:Peter
:pbpix@optonline.net
:
:
Like Boyd says, these were put on some pre-war radios to allow shunting nearby maritime stations that could interfere with the AM broadcast band. The idea was that if you had such a problem, you could adjust the capacitor "E" to shunt the offending signal to ground.
It's my understanding that all those maritime stations are long gone. So, I think you can just leave the variable cap disconnected (the one you goofed up). Notice how "E" is in series with the coil labeled "1"? Together, they could be tuned to shunt the offending station. The coil and cap are not needed.
Tony
:OK, so the device that we're talking about is the wave trap, labeled "E" on the schematic and on the chassis-top drawing? http://www.nostalgiaair.org/PagesByModel/008/M0025008.pdf
:
:Like Boyd says, these were put on some pre-war radios to allow shunting nearby maritime stations that could interfere with the AM broadcast band. The idea was that if you had such a problem, you could adjust the capacitor "E" to shunt the offending signal to ground.
:
:It's my understanding that all those maritime stations are long gone. So, I think you can just leave the variable cap disconnected (the one you goofed up). Notice how "E" is in series with the coil labeled "1"? Together, they could be tuned to shunt the offending station. The coil and cap are not needed.
Y'know it's a real laugh as to why this happened at all. Anyway it came to me in the BC position and all broadcast stations were playing fine. ( except the preset 'auto' push buttons weren't doing anything... so I just figured they were shot or disabled somehow and I'd look into that later) Then I finally realized why I had no SW... I wasn't even in the SW position.!!!!!!!!!! ... such is the sad tale of ignorance, blissfully stupid enthusiasm and freak happenstance! But all is well that ends well. Thanks in part to the generous efforts and hints you all gave me. :I don't see how it can be the wavetrap. He said one end was tied to the bandswitch. The wavetrap is not tied to the bandswitch.
The previous owner refinished the case to an almost unbeliveable glossy perfect state!
But it seems that in the process he removed the lettering on the case above the band switch.
As a result, when I got it I had no idea that that band switch has THREE positions.
I only saw two bands on the dial face: BC and SW ....so why would I even think there were three?
So my next thing was to turn the switch one notch that I assumed was the SW position to test it.
..... Well there was NO ShortWave ... nuttin!! only total silence.!!! Not even static.
So that's when I started troubleshooting, and I found the SW local oscillator was not running and while poking around I saw this oil-soaked trimmer and thought that it might be loading down the oscillator. So that's when I removed it and sort of destroyed it.
But while I was playing around with that trimmer removed... I pressed one of the "auto" prestet station buttons for some reason.... and a BC station started playing loud and clear!!
Well I was now very confused for a few moments till I realized that the swith has 2 broadcast positions. The 2nd poition is to set it to 'Auto' for the push buttons to work, I guess!!
So I rotated it to the next position and got some static and when touching the SW oscillator coil with my fingers it sort of tuned in something a little.... Touching the lead on the band switch where I had removed the trimmer made it even better. So I was NOW filled with bot Joy and Greif at the same time. Because I was happy I discoverd the switch function... but also realized that the key to getting this on SW NOW was the mangled condenser I just destoyed due to my own ignorance of the proper use of the band switch... lol
Thank you,
Peter
:
:Tony
:
::OK, so the device that we're talking about is the wave trap, labeled "E" on the schematic and on the chassis-top drawing? http://www.nostalgiaair.org/PagesByModel/008/M0025008.pdf
::
::Like Boyd says, these were put on some pre-war radios to allow shunting nearby maritime stations that could interfere with the AM broadcast band. The idea was that if you had such a problem, you could adjust the capacitor "E" to shunt the offending signal to ground.
::
::It's my understanding that all those maritime stations are long gone. So, I think you can just leave the variable cap disconnected (the one you goofed up). Notice how "E" is in series with the coil labeled "1"? Together, they could be tuned to shunt the offending station. The coil and cap are not needed.
:Hey.. Wow !! thanks a ton for al your input you guys.
:... But after much gnashing of teeth I got that condenser back together...albeit minus a few mica insulators left over on my bench...lol
: This trimmer/padder thingie has 2 independent sets of about 8 plates that I had dis-engaged and spread each set apart and removed all the micas and cleaned everything.
:That left me with these 2 fanned out groups of plates and a stack of micas. I couldn't seem to manage reinserting these two sets of plates back to inter-lap and at the same time inserting micas back in between on both sides of every plate. It actually was eating into my peaceful sleep last night and I woke up with a thought that perhaps I'll just re-integrate the plates first...and try to insert the micas afterwards. It worked.
:I don't even have all the micas in ... but it works!
:As soon as I resoldered it... the SW band came alive.
:I calibrated it with the sig gen at 18mz and after a few tweaks all seems to work.
:I think this cap is C-10... maybe
:... However c-10 in the parts list is a #22-519 'trimmer'...
:and this cap is clearly marked #22-563...
:..and the ONLY #22-563 on the schematic is C-8 'fixed padder'
:.. so go figure.
:
:Y'know it's a real laugh as to why this happened at all.
:The previous owner refinished the case to an almost unbeliveable glossy perfect state!
(you can view it on my site at pbpix.com/zenith.jpg )
:But it seems that in the process he removed the lettering on the case above the band switch.
:As a result, when I got it I had no idea that that band switch has THREE positions.
:I only saw two bands on the dial face: BC and SW ....so why would I even think there were three?
:
:Anyway it came to me in the BC position and all broadcast stations were playing fine. ( except the preset 'auto' push buttons weren't doing anything... so I just figured they were shot or disabled somehow and I'd look into that later)
: So my next thing was to turn the switch one notch that I assumed was the SW position to test it.
:..... Well there was NO ShortWave ... nuttin!! only total silence.!!! Not even static.
:So that's when I started troubleshooting, and I found the SW local oscillator was not running and while poking around I saw this oil-soaked trimmer and thought that it might be loading down the oscillator. So that's when I removed it and sort of destroyed it.
:But while I was playing around with that trimmer removed... I pressed one of the "auto" prestet station buttons for some reason.... and a BC station started playing loud and clear!!
:Well I was now very confused for a few moments till I realized that the swith has 2 broadcast positions. The 2nd poition is to set it to 'Auto' for the push buttons to work, I guess!!
:
:Then I finally realized why I had no SW... I wasn't even in the SW position.!!!!!!!!!!
:So I rotated it to the next position and got some static and when touching the SW oscillator coil with my fingers it sort of tuned in something a little.... Touching the lead on the band switch where I had removed the trimmer made it even better. So I was NOW filled with bot Joy and Greif at the same time. Because I was happy I discoverd the switch function... but also realized that the key to getting this on SW NOW was the mangled condenser I just destoyed due to my own ignorance of the proper use of the band switch... lol
:
:... such is the sad tale of ignorance, blissfully stupid enthusiasm and freak happenstance!
:
:But all is well that ends well. Thanks in part to the generous efforts and hints you all gave me.
:Thank you,
:Peter
:
:
:
:
:
:
:
::I don't see how it can be the wavetrap. He said one end was tied to the bandswitch. The wavetrap is not tied to the bandswitch.
::
::Tony
::
:::OK, so the device that we're talking about is the wave trap, labeled "E" on the schematic and on the chassis-top drawing? http://www.nostalgiaair.org/PagesByModel/008/M0025008.pdf
:::
:::Like Boyd says, these were put on some pre-war radios to allow shunting nearby maritime stations that could interfere with the AM broadcast band. The idea was that if you had such a problem, you could adjust the capacitor "E" to shunt the offending signal to ground.
:::
:::It's my understanding that all those maritime stations are long gone. So, I think you can just leave the variable cap disconnected (the one you goofed up). Notice how "E" is in series with the coil labeled "1"? Together, they could be tuned to shunt the offending station. The coil and cap are not needed.