Zenith 8S463 alignment question

2/19/2013 7:46:55 PMBill G.

Hi All,
In the Zenith 8S463 I am restoring the coil marked as '7' was open. I have been able to find a replacement.
I assumed that it was used to keep the converter stage from oscillating at the IF.
My question is this. How is it best adjusted?

The schematic can be found on this site, http://www.nostalgiaair.org/Resources/455/M0025455.htm

All the Best,

Bill Grimm

2/19/2013 8:20:14 PMTom McHenry

You need to find the alignment instructions for Zenith chassis 5808. The adjustment procedure regarding the wavetrap adjustment is supposedly sensitive to the order in which it is performed with respect to the entire alignment steps.

2/19/2013 8:28:57 PMBill G.

:You need to find the alignment instructions for Zenith chassis 5808. The adjustment procedure regarding the wavetrap adjustment is supposedly sensitive to the order in which it is performed with respect to the entire alignment steps.
:
Hi Tom,
Thank you for the response.
Any idea where those alignment instructions could be found. I have looked but not come up with anything.

Best Regards,

Bill Grimm

2/19/2013 10:41:53 PMTom McHenry

Here's a scan of the alignment procedure that might be useful:

http://antiqueradios.com/gallery/d/1123 ... h8S463.png

2/24/2013 5:13:40 PMBill G.

: Here's a scan of the alignment procedure that might be useful:
:
:http://antiqueradios.com/gallery/d/1123 ... h8S463.png
:
Hi Tom,
The link did not come through properly. Could you resend?

All the Best,

Bill

2/24/2013 6:53:04 PMTom McHenry

Hi Tom,
: The link did not come through properly. Could you resend?
= = = = = = =
Bill,
Email me at lorenz200w@yahoo.com and I'll flip you a copy.

2/19/2013 8:34:18 PMWarren

The “wave trap” is to suppress unwanted RF getting into the signal path. Back then a frequency close to the IF frequency would interfere. The trap was adjusted to reject that frequency. Nowadays it’s not really needed. You can adjust the trimmer wide open. There is no difference in the radios performance.

2/19/2013 8:36:57 PMBill G.

:The “wave trap” is to suppress unwanted RF getting into the signal path. Back then a frequency close to the IF frequency would interfere. The trap was adjusted to reject that frequency. Nowadays it’s not really needed. You can adjust the trimmer wide open. There is no difference in the radios performance.
:
Thank you, Warren, for clearing that up.
It isn't for oscillation at all!

All the Best,

Bill

2/20/2013 10:43:45 AMClifton

Bill,

For a little bit of discussion of the 'wave trap':

http://www.antiqueradios.com/forums/viewtopic.php?t=36431

Clifton

::The “wave trap” is to suppress unwanted RF getting into the signal path. Back then a frequency close to the IF frequency would interfere. The trap was adjusted to reject that frequency. Nowadays it’s not really needed. You can adjust the trimmer wide open. There is no difference in the radios performance.
::
:Thank you, Warren, for clearing that up.
:It isn't for oscillation at all!
:
:All the Best,
:
:Bill
:

2/21/2013 5:15:24 PMBill G.

Thanks for the link, Clifton.

Best Regards,

Bill