Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver - UK Vintage Radio Repair and Restoration Discussion Forum

twarrior · 7th Sep 2015, 10:45 am

Hello,

I have recently bought a gorgeous Tandberg TR 2075 Receiver from Canada. Unfortunately it operates on 110 Volts.

I have read that it's possible to change the voltage internally with this Receiver, but I can't find any instructions on how to do this anywhere on the web.

I would very much appreciate help and advice with this.

Thank you very much.

Station X · 7th Sep 2015, 10:50 am

IF it's possible to change the voltage, it's a matter of connecting the mains transformer's primary windings in series rather than in parallel. There may be straps or links which you can reconfigure. Otherwise you'll need to unsolder and resolder wires.

Alternative you could use an external transformer of suitable rating.

FIXITNOW · 7th Sep 2015, 10:55 am

Open it up and do a picture of the mains side of the transformer so we can see if it is possible.

camallison · 7th Sep 2015, 11:13 am

The service manual is available here:

http://www.hifiengine.com/manual_lib.../tr-2075.shtml

Colin

camallison · 7th Sep 2015, 11:20 am

The mains transformer has indeed series or parallel connection possibility - see attached pic.

Colin

Station X · 7th Sep 2015, 11:40 am

Remove the wires from 1-2 and 3-4 making sure to maintain the connection to the mains lead. Provide a new wire from 2-3.

paulsherwin · 7th Sep 2015, 11:44 am

As a side issue, the FM de-emphasis is likely to be set for North America (75uS) rather than Europe (50uS). There may be a switch or jumper on the circuit board to change this, but if you don't or can't change it, FM reception will sound dull and lacking in high treble.

Herald1360 · 7th Sep 2015, 12:25 pm

If those aux mains outlets are marked as 120V in any way, it would be sensible to re-mark them as 240V. You never know who might end up with the set!

paulsherwin · 7th Sep 2015, 1:08 pm

Or disconnect them.

broadgage · 7th Sep 2015, 10:51 pm

That would be preferable in my view as they may be of marginal safety on 240 volts.

SteveCG · 9th Sep 2015, 10:29 am

Does the op really mean 220V? I notice the upper transformer primary on the diagram has a tap - so this is probably for 220V operation - provided the primaries are wired in series.

7th Sep 2015, 10:45 am	#1
twarrior Retired Dormant Member Join Date: Sep 2015 Location: Forres, Moray, UK. Posts: 1	Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver Hello, I have recently bought a gorgeous Tandberg TR 2075 Receiver from Canada. Unfortunately it operates on 110 Volts. I have read that it's possible to change the voltage internally with this Receiver, but I can't find any instructions on how to do this anywhere on the web. I would very much appreciate help and advice with this. Thank you very much.

7th Sep 2015, 10:50 am	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver IF it's possible to change the voltage, it's a matter of connecting the mains transformer's primary windings in series rather than in parallel. There may be straps or links which you can reconfigure. Otherwise you'll need to unsolder and resolder wires. Alternative you could use an external transformer of suitable rating. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

7th Sep 2015, 10:55 am	#3
FIXITNOW Octode Join Date: Feb 2007 Location: Ely, Cambridgeshire, UK. Posts: 1,976	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver Open it up and do a picture of the mains side of the transformer so we can see if it is possible.

7th Sep 2015, 11:13 am	#4
camallison Heptode Join Date: Feb 2013 Location: Yarm, North Yorkshire, UK. Posts: 535	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver The service manual is available here: http://www.hifiengine.com/manual_lib.../tr-2075.shtml Colin

7th Sep 2015, 11:20 am	#5
camallison Heptode Join Date: Feb 2013 Location: Yarm, North Yorkshire, UK. Posts: 535	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver The mains transformer has indeed series or parallel connection possibility - see attached pic. Colin Attached Thumbnails

7th Sep 2015, 11:40 am	#6
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver Remove the wires from 1-2 and 3-4 making sure to maintain the connection to the mains lead. Provide a new wire from 2-3. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

7th Sep 2015, 11:44 am	#7
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,970	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver As a side issue, the FM de-emphasis is likely to be set for North America (75uS) rather than Europe (50uS). There may be a switch or jumper on the circuit board to change this, but if you don't or can't change it, FM reception will sound dull and lacking in high treble.

7th Sep 2015, 12:25 pm	#8
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver If those aux mains outlets are marked as 120V in any way, it would be sensible to re-mark them as 240V. You never know who might end up with the set! __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

7th Sep 2015, 1:08 pm	#9
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,970	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver Or disconnect them.

7th Sep 2015, 10:51 pm	#10
broadgage Nonode Join Date: Jan 2010 Location: North Somerset, UK. Posts: 2,130	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver That would be preferable in my view as they may be of marginal safety on 240 volts.

9th Sep 2015, 10:29 am	#11
SteveCG Nonode Join Date: Jun 2009 Location: Herefordshire, UK. Posts: 2,495	Re: Changing Voltage from 110 Volts to 220 Volts on a Tandberg 2075 Receiver Does the op really mean 220V? I notice the upper transformer primary on the diagram has a tap - so this is probably for 220V operation - provided the primaries are wired in series.