McMichael 808 radio alignment query. - UK Vintage Radio Repair and Restoration Discussion Forum

Boater Sam · 2nd Feb 2018, 9:47 am

I am finding conflicting IF frequency figures for the McMichael 808 radio.

Broadcaster Service Man's sheet January 1939 quotes 465 kc/s, but Trader sheet #477 27th July 1940 quotes 460 kc/s

I doubt that 5 kc/s would make a whole lot of difference but would like to start out with the correct information.

I can't find a sheet from McMichael themselves.

crackle · 2nd Feb 2018, 10:39 am

Hi Sam
I have often found that the Broadcaster sheets seemed to follow more closely the manufacturers service information than the Trader sheets, at least they did for the KB service sheets.
You could do what I did recently, find a known radio station on the dial and check what the local oscillator frequency is on a decent modern radio with digital frequency readout..
Mike

ukcol · 2nd Feb 2018, 10:53 am

Hi Sam

I can only muddy the waters I'm afraid.

According to Radiomuseum it is 460Khz.
https://www.radiomuseum.org/r/mcmichael_808_2.html

But - Appendix 1, "Intermediate Frequencies" in Chase Millar's book "Valve Radio & Audio Repair Handbook" it is 465Khz.

No doubt the above is a reflection of the sources used for information in each case.

Leon Crampin · 2nd Feb 2018, 4:12 pm

I have a book "The Practical Radio Reference Book" - Odhams, edited by Roy C Norris which contains a table of IF frequencies for radios of this period.

The McMichael 808 has an IF of 465 kHz in this publication.

Leon.

Boater Sam · 3rd Feb 2018, 6:55 am

Knowing that the Trader sheets did have some errors and that the noble Chas, Odhams and the old Broadcaster all agree on 465kc/s which is a pretty standard IF anyway, I'll go with the majority.
Thanks guys for the input.
Now to see if I can get the handle off and back on again! Some will know the horrors of this set.

2nd Feb 2018, 9:47 am	#1
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	McMichael 808 radio alignment query. I am finding conflicting IF frequency figures for the McMichael 808 radio. Broadcaster Service Man's sheet January 1939 quotes 465 kc/s, but Trader sheet #477 27th July 1940 quotes 460 kc/s I doubt that 5 kc/s would make a whole lot of difference but would like to start out with the correct information. I can't find a sheet from McMichael themselves. Last edited by Boater Sam; 2nd Feb 2018 at 9:48 am. Reason: correction

2nd Feb 2018, 10:39 am	#2
crackle Rest in Peace Join Date: Mar 2011 Location: Basildon, Essex, UK. Posts: 4,100	Re: McMichael 808 radio alignment query. Hi Sam I have often found that the Broadcaster sheets seemed to follow more closely the manufacturers service information than the Trader sheets, at least they did for the KB service sheets. You could do what I did recently, find a known radio station on the dial and check what the local oscillator frequency is on a decent modern radio with digital frequency readout.. Mike

2nd Feb 2018, 10:53 am	#3
ukcol Rest in Peace Join Date: May 2003 Location: Harlaxton, Lincolnshire, UK. Posts: 3,944	Re: McMichael 808 radio alignment query. Hi Sam I can only muddy the waters I'm afraid. According to Radiomuseum it is 460Khz. https://www.radiomuseum.org/r/mcmichael_808_2.html But - Appendix 1, "Intermediate Frequencies" in Chase Millar's book "Valve Radio & Audio Repair Handbook" it is 465Khz. No doubt the above is a reflection of the sources used for information in each case.

3rd Feb 2018, 6:55 am	#5
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: McMichael 808 radio alignment query. Knowing that the Trader sheets did have some errors and that the noble Chas, Odhams and the old Broadcaster all agree on 465kc/s which is a pretty standard IF anyway, I'll go with the majority. Thanks guys for the input. Now to see if I can get the handle off and back on again! Some will know the horrors of this set.

2nd Feb 2018, 4:12 pm	#4
Leon Crampin Octode Join Date: Nov 2005 Location: Surrey, UK. Posts: 1,870	Re: McMichael 808 radio alignment query. I have a book "The Practical Radio Reference Book" - Odhams, edited by Roy C Norris which contains a table of IF frequencies for radios of this period. The McMichael 808 has an IF of 465 kHz in this publication. Leon.