Mains adapter for Tandberg TP-41 info - UK Vintage Radio Repair and Restoration Discussion Forum

stevehertz · 24th Nov 2017, 4:28 pm

I'm looking for a mains adapter for a Tandberg TP-41. Is there a modern 'over the counter' adapter available?

Otherwise, what is the spec of the plug? I know the requirement is for 12V DC and that the inner connection is the negative one. Any info, photos, links etc welcome, thanks.

ukcol · 24th Nov 2017, 5:05 pm

All (most?) of the generic 12v 500 mA regulated adaptors seem to have POSITIVE on the centre pin, this universal may be suitable BUT it is a switch mode type.

Adaptor on ebay.

stevehertz · 24th Nov 2017, 5:54 pm

Thanks ukcol.

Since posting I've gone through my box of spare mains adaptors and found a 12v one that is (the incorrect) +ve on the centre 'hole'. So I'll get a solderable plug from Maplin and connect it for centre -ve. Can anyone confirm that the spec is 2.5mm x 5.5mm ? I'm pretty sure it is, here's the Maplin one: https://www.maplin.co.uk/p/maplin-25...wer-plug-hh62s

Does the Tandberg have any internal smoothing, regulation etc when used in 'adaptor mode' or does it rely on a perfectly good, smooth, 12DC supply? Because the batteries only supply 9V? What's the current requirement? Thanks.

ronbryan · 24th Nov 2017, 6:40 pm

You do need to check that your 12V input plug is actually long enough to disconnect the internal 9V battery via the contact on the barrel.

The TP41 only has a bias regulator D501, which derives a stabilised supply of about 1.5V for the base bias of the tuner and IF transistors. This is used for both internal and external voltage supplies.

Ron

24th Nov 2017, 4:28 pm	#1
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,834	Mains adapter for Tandberg TP-41 info I'm looking for a mains adapter for a Tandberg TP-41. Is there a modern 'over the counter' adapter available? Otherwise, what is the spec of the plug? I know the requirement is for 12V DC and that the inner connection is the negative one. Any info, photos, links etc welcome, thanks. __________________ A digital radio is the latest thing, but a vintage wireless is forever..

24th Nov 2017, 5:05 pm	#2
ukcol Rest in Peace Join Date: May 2003 Location: Harlaxton, Lincolnshire, UK. Posts: 3,944	Re: Mains adapter for Tandberg TP-41 info All (most?) of the generic 12v 500 mA regulated adaptors seem to have POSITIVE on the centre pin, this universal may be suitable BUT it is a switch mode type. Adaptor on ebay.

24th Nov 2017, 5:54 pm	#3
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,834	Re: Mains adapter for Tandberg TP-41 info Thanks ukcol. Since posting I've gone through my box of spare mains adaptors and found a 12v one that is (the incorrect) +ve on the centre 'hole'. So I'll get a solderable plug from Maplin and connect it for centre -ve. Can anyone confirm that the spec is 2.5mm x 5.5mm ? I'm pretty sure it is, here's the Maplin one: https://www.maplin.co.uk/p/maplin-25...wer-plug-hh62s Does the Tandberg have any internal smoothing, regulation etc when used in 'adaptor mode' or does it rely on a perfectly good, smooth, 12DC supply? Because the batteries only supply 9V? What's the current requirement? Thanks. __________________ A digital radio is the latest thing, but a vintage wireless is forever..

24th Nov 2017, 6:40 pm	#4
ronbryan Octode Join Date: Jan 2003 Location: Guildford, Surrey, UK. Posts: 1,960	Re: Mains adapter for Tandberg TP-41 info You do need to check that your 12V input plug is actually long enough to disconnect the internal 9V battery via the contact on the barrel. The TP41 only has a bias regulator D501, which derives a stabilised supply of about 1.5V for the base bias of the tuner and IF transistors. This is used for both internal and external voltage supplies. Ron