R1155N help required please. - UK Vintage Radio Repair and Restoration Discussion Forum

Derrick D · 2nd Nov 2022, 9:33 am

Hi, this is my first post to the forum - apologies for any errors:

I am rebuilding a R1155N receiver which I acquired in pieces. I am having difficulty in a couple of areas:

L30 (Audio transformer) – I can find no data relating the physical terminals of the transformer to their position either in the schematic (A.P.2548A Fig 4) or on the web.

Similarly for the 3 D.F. transformers L4, L5 & L40. Can anyone tell me for each transformer which terminal is which?

On The schematic there is an unidentified inductor shown below L40/above L3 (center tap to ground and winding ends to F.S. wf 2 and 8). can anyone tell me what it’s reference is?

Also, ref L40... someone would appear to have taken a hacksaw to it and cut off the ferrite slug. Does anyone have any information on what the complete tuning slug should look like?

Many thanks,
Derrick

Aub · 2nd Nov 2022, 12:17 pm

Hi Derrick, welcome.

Have you tried the VMARS site. They have a library, accessable to all, of all kinds of manuals.

Cheers

All

Derrick D · 2nd Nov 2022, 2:50 pm

Hi, thanks for the reply - yes have consulted VMARS library. Unfortunately (unless I'm missing something) the official documentation - A.P.2548A & AP1186 don't show relationships between parts physical connections and electrical schematic.

Derrick

M0FYA Andy · 2nd Nov 2022, 5:17 pm

Do these diagrams help?

Andy

Derrick D · 2nd Nov 2022, 5:55 pm

Andy, looks promising! thank you very much...... It will take me a while to get my head around it but these look great.
Thank you again.

Derrick

2nd Nov 2022, 9:33 am	#1
Derrick D Diode Join Date: Nov 2022 Location: Dursley, Gloucestershire, UK. Posts: 3	R1155N help required please. Hi, this is my first post to the forum - apologies for any errors: I am rebuilding a R1155N receiver which I acquired in pieces. I am having difficulty in a couple of areas: L30 (Audio transformer) – I can find no data relating the physical terminals of the transformer to their position either in the schematic (A.P.2548A Fig 4) or on the web. Similarly for the 3 D.F. transformers L4, L5 & L40. Can anyone tell me for each transformer which terminal is which? On The schematic there is an unidentified inductor shown below L40/above L3 (center tap to ground and winding ends to F.S. wf 2 and 8). can anyone tell me what it’s reference is? Also, ref L40... someone would appear to have taken a hacksaw to it and cut off the ferrite slug. Does anyone have any information on what the complete tuning slug should look like? Many thanks, Derrick

2nd Nov 2022, 12:17 pm	#2
Aub Nonode Join Date: Mar 2005 Location: Nuneaton, Warwickshire, UK. Posts: 2,040	Re: R1155N help required please. Hi Derrick, welcome. Have you tried the VMARS site. They have a library, accessable to all, of all kinds of manuals. Cheers All __________________ Life's a long song, but the tune ends too soon for us all.

2nd Nov 2022, 2:50 pm	#3
Derrick D Diode Join Date: Nov 2022 Location: Dursley, Gloucestershire, UK. Posts: 3	Re: R1155N help required please. Hi, thanks for the reply - yes have consulted VMARS library. Unfortunately (unless I'm missing something) the official documentation - A.P.2548A & AP1186 don't show relationships between parts physical connections and electrical schematic. Derrick

2nd Nov 2022, 5:55 pm	#5
Derrick D Diode Join Date: Nov 2022 Location: Dursley, Gloucestershire, UK. Posts: 3	Re: R1155N help required please. Andy, looks promising! thank you very much...... It will take me a while to get my head around it but these look great. Thank you again. Derrick