Unknown Transformer ID help - UK Vintage Radio Repair and Restoration Discussion Forum

Rogers-Lodger · 12th Sep 2018, 12:36 pm

Hello All

I'm on the hunt for knowledge and have come straight to the source. I have a clutch of what I believe to be line balancing transformers made by Parmeko or Partridge (they were part of the same company it seems at one point). They measure 20 Ohm in and 25 or 40 out. Please see my photos. any advice much appreciated.

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Rogers-Lodger · 12th Sep 2018, 12:37 pm

Well I'm interested to know if anyone can confirm the manufacturer and or what use they were intended for, spec etc.

Thanks in advance

Dave

CambridgeWorks · 12th Sep 2018, 1:13 pm

Maybe Pye telecom line interface transformers? Late 50s into 60s they they used 6 digit numbers for spares. I recall a lot starting with 2.
Certainly by 1968 transformers started AL. EG Westminster am dash mod transformer is AL21219.
Rob

dazzlevision · 12th Sep 2018, 2:02 pm

They are certainly Pye part numbers.

Pye changed their part numbering system around 1963, following their merger with E K Cole (Ekco). Thereafter, Pye/Ekco group part numbers started with two letters, followed by five numerical digits.

I have a similar looking transformer that came out of a circa 1962 Pye AM/FM tuner (all transistor). It was the mains transformer.

Rogers-Lodger · 12th Sep 2018, 2:23 pm

Thanks Robin

Pye makes sense as some other parts from the same source were pye ... and weirdly I have some transformers with AL part numbers too. So problem solved I think. You confirmed that too Dazzle cheers !

beamcurrent · 12th Sep 2018, 7:26 pm

I agree with the earlier comments they are indeed typical of the Pye construction and the 770xxx number are definitively Pye.

Pye used a large number of transformers types in the professional equipment they made, and in my case TV cameras and the like.

Did a list of them ever exist? Number, function, spec, equipment used in? that would be a very useful list if it existed.

Brian

Jon_G4MDC · 13th Sep 2018, 8:36 am

Very reminiscent of the transformer in a U450L receiver.
Top right in the lower unit of the attachment.

I have manual and can check part number. Once I have located said manual...

12th Sep 2018, 12:36 pm	#1
Rogers-Lodger Pentode Join Date: Aug 2011 Location: Brighton, East Sussex, UK. Posts: 149	Unknown Transformer ID help Hello All I'm on the hunt for knowledge and have come straight to the source. I have a clutch of what I believe to be line balancing transformers made by Parmeko or Partridge (they were part of the same company it seems at one point). They measure 20 Ohm in and 25 or 40 out. Please see my photos. any advice much appreciated. **************/giTCh9 ************/eXUw9p **************/mm1yN9

12th Sep 2018, 12:37 pm	#2
Rogers-Lodger Pentode Join Date: Aug 2011 Location: Brighton, East Sussex, UK. Posts: 149	Re: Unknown Transformer ID help Well I'm interested to know if anyone can confirm the manufacturer and or what use they were intended for, spec etc. Thanks in advance Dave

12th Sep 2018, 1:13 pm	#3
CambridgeWorks Nonode Join Date: Jun 2010 Location: Spalding, Peterborough, Cambridgeshire, UK. Posts: 2,859	Re: Unknown Transformer ID help Maybe Pye telecom line interface transformers? Late 50s into 60s they they used 6 digit numbers for spares. I recall a lot starting with 2. Certainly by 1968 transformers started AL. EG Westminster am dash mod transformer is AL21219. Rob __________________ Apprehension creeping like a tube train up your spine - Cymbaline. Film More soundtrack - Pink Floyd

12th Sep 2018, 2:02 pm	#4
dazzlevision Dekatron Join Date: Sep 2003 Location: Near Swindon, North Wiltshire, UK. Posts: 3,611	Re: Unknown Transformer ID help They are certainly Pye part numbers. Pye changed their part numbering system around 1963, following their merger with E K Cole (Ekco). Thereafter, Pye/Ekco group part numbers started with two letters, followed by five numerical digits. I have a similar looking transformer that came out of a circa 1962 Pye AM/FM tuner (all transistor). It was the mains transformer.

12th Sep 2018, 2:23 pm	#5
Rogers-Lodger Pentode Join Date: Aug 2011 Location: Brighton, East Sussex, UK. Posts: 149	Re: Unknown Transformer ID help Thanks Robin Pye makes sense as some other parts from the same source were pye ... and weirdly I have some transformers with AL part numbers too. So problem solved I think. You confirmed that too Dazzle cheers !

12th Sep 2018, 7:26 pm	#6
beamcurrent Heptode Join Date: Mar 2008 Location: Camberley, Surrey, UK. Posts: 805	Re: Unknown Transformer ID help I agree with the earlier comments they are indeed typical of the Pye construction and the 770xxx number are definitively Pye. Pye used a large number of transformers types in the professional equipment they made, and in my case TV cameras and the like. Did a list of them ever exist? Number, function, spec, equipment used in? that would be a very useful list if it existed. Brian __________________ Regards Brian Visit the Virtual Broadcast TV Camera Museum

13th Sep 2018, 8:36 am	#7
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Unknown Transformer ID help Very reminiscent of the transformer in a U450L receiver. Top right in the lower unit of the attachment. I have manual and can check part number. Once I have located said manual... Attached Thumbnails