1st I.F. on Ekco PB179 - UK Vintage Radio Repair and Restoration Discussion Forum

Radio Tech · 18th Aug 2016, 10:08 am

Has anyone got information on the 1st I.F. of this radio, I am a little confused on how the slugs are adjusted, at the moment the slugs appear to be the wrong way round in the coils that are housed within the can, and it is just impossible to get to them to check the adjustment, I did wonder if the I.F. coil had been removed at some stage and put back in the wrong position, can someone verify this.

Best wishes

Ken

ms660 · 18th Aug 2016, 10:19 am

Are the slugs visible through the holes that are shown indicated by the arrows in the chassis layout on the Trader sheet?

According to the Trader sheet the pri and sec coils are at right angles to each other.

I've never worked on one of these.

Lawrence.

Radio Tech · 18th Aug 2016, 11:02 am

Slugs are visible but as you will see with the next three pictures it shows the slot in the slug is not visible, and yes I agree the primary and sec are at 90 deg to each other.

Ken

ms660 · 18th Aug 2016, 11:15 am

Probably have to strip out the transformer to find out what's what.

Good luck whicheverways.

Lawrence.

GeoffK · 18th Aug 2016, 2:01 pm

Do the IF's actually need adjusting, they seldom do. Best left alone unless they have been moved before. I have repaired valve radios, and the occasional TV, and have never touched the tuned circuits.

Radio Tech · 18th Aug 2016, 2:37 pm

Hi folks

I just wanted to make sure the I.F.'s were peaked up, I managed to peak the second I.F. as the cores were in the right way round, despite the fact that I get a reasonable o/p of volume on BBC Essex after changing the variable Mu I.F. amplifier valve (used a AC/VP2) but if the cores in the 1st I.F. are the wrong way round and the coil is wired correctly (I assume so) how did the manufacturer Ekco ever adjust it in the first place I wonder.

Perhaps other members have an opinion please as well.

Best wishes

Ken

ms660 · 18th Aug 2016, 3:17 pm

Any signs of the cores being sheared?

Lawrence.

18th Aug 2016, 10:08 am	#1
Radio Tech Nonode Join Date: Dec 2012 Location: Bocking, near Braintree, Essex, UK. Posts: 2,071	1st I.F. on Ekco PB179 Has anyone got information on the 1st I.F. of this radio, I am a little confused on how the slugs are adjusted, at the moment the slugs appear to be the wrong way round in the coils that are housed within the can, and it is just impossible to get to them to check the adjustment, I did wonder if the I.F. coil had been removed at some stage and put back in the wrong position, can someone verify this. Best wishes Ken Attached Thumbnails

18th Aug 2016, 10:19 am	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: 1st I.F. on Ekco PB179 Are the slugs visible through the holes that are shown indicated by the arrows in the chassis layout on the Trader sheet? According to the Trader sheet the pri and sec coils are at right angles to each other. I've never worked on one of these. Lawrence.

18th Aug 2016, 11:02 am	#3
Radio Tech Nonode Join Date: Dec 2012 Location: Bocking, near Braintree, Essex, UK. Posts: 2,071	Re: 1st I.F. on Ekco PB179 Slugs are visible but as you will see with the next three pictures it shows the slot in the slug is not visible, and yes I agree the primary and sec are at 90 deg to each other. Ken Attached Thumbnails

18th Aug 2016, 11:15 am	#4
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: 1st I.F. on Ekco PB179 Probably have to strip out the transformer to find out what's what. Good luck whicheverways. Lawrence.

18th Aug 2016, 2:01 pm	#5
GeoffK Heptode Join Date: Mar 2016 Location: Essex, UK. Posts: 602	Re: 1st I.F. on Ekco PB179 Do the IF's actually need adjusting, they seldom do. Best left alone unless they have been moved before. I have repaired valve radios, and the occasional TV, and have never touched the tuned circuits.

18th Aug 2016, 2:37 pm	#6
Radio Tech Nonode Join Date: Dec 2012 Location: Bocking, near Braintree, Essex, UK. Posts: 2,071	Re: 1st I.F. on Ekco PB179 Hi folks I just wanted to make sure the I.F.'s were peaked up, I managed to peak the second I.F. as the cores were in the right way round, despite the fact that I get a reasonable o/p of volume on BBC Essex after changing the variable Mu I.F. amplifier valve (used a AC/VP2) but if the cores in the 1st I.F. are the wrong way round and the coil is wired correctly (I assume so) how did the manufacturer Ekco ever adjust it in the first place I wonder. Perhaps other members have an opinion please as well. Best wishes Ken

18th Aug 2016, 3:17 pm	#7
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: 1st I.F. on Ekco PB179 Any signs of the cores being sheared? Lawrence.