Arvin 182TFM Alignment ? - Printable Version

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+--- Thread: Arvin 182TFM Alignment ? (/showthread.php?tid=17020)

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Arvin 182TFM Alignment ? - Eric - 07-18-2017

I've been working on this one for a while and I have the same problem and that is identifying grids on tubes.
http://www.nostalgiaair.org/pagesbymodel/465/M0012465.pdf

In the procedure calls for connecting to the Converter grid through a .05 cap to the signal gen? Now the paperwork lists the 12BE6 as the OSC Converter
 Pin #1 Ocs grid, or 6,7. ???
 Does it matter the position the tuner is paper work does not say?

Thanks Eric

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RE: Arvin 182TFM Alignment ? - morzh - 07-18-2017

Pin 7, I think.
Dial should be set at some lower frequency, like 560-580kc.

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RE: Arvin 182TFM Alignment ? - Eric - 07-20-2017

This thing is making me crazy 
It appears I have an intermittent problem. 
1-FM works and has from day one.
2-The AM will come on play for a while then fade out. 
3- I have checked and replaced all resistor out of Tolerance
4- Tubes have been checked and I have had put replacements in no change
5- I have done voltage checks and do not see anything crazy I'm using a digital meter
6- it is not working more than it is, I've poked and prodded looking for cold solder Joints 
7- Had no problem doing an alignment on the am side tone was where it was supposed to be.

I'm beginning to think I might have a capacitor going bad, there are a lot of small dog bone PF capacitors?
Any idea's on where to look??

Thanks Eric

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RE: Arvin 182TFM Alignment ? - Radioroslyn - 07-22-2017

> Tubes have been checked and I have had put replacements in no change

When it fades out do the tubes stay lit??
Could have an intermittent filament or bad connection at the socket.

Use a second receiver to listen for the local osc @ 455kc above the broken set's dial setting when it's faded out.
This will rule out an intermittent osc coil.

You can use your signal generator to troubleshoot by ejecting a 455kc signal at the ant when faded.
This will tell you if the IF,det,and audio are the issue.

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