Alan Holmes wrote:


"Ian Bell" wrote in message
...
Just got an email from Maplin to say they are out of stock of their one
and
only type of mains transformer for tube supplies (250-0-259 @150mA and
6.3VAC secondaries).

Where else can I get something similar in the UK?

Come and root through my garage and sheds!

Love to. Where are you?

Ian

In article , Ian Bell
writes
Don Pearce wrote:

On Mon, 18 Jun 2007 21:30:24 +0100, Ian Bell
wrote:

Just got an email from Maplin to say they are out of stock of their one
and only type of mains transformer for tube supplies (250-0-259 @150mA and
6.3VAC secondaries).

Where else can I get something similar in the UK?

Cheers

ian

You might try these

http://www.vvttransformers.co.uk/

But Google seems to be quite productive in possible sources.

d



Thanks Don. I found vvt through Google too but they seem to be rather
expensive circa £80 for a transformer similar to one that Maplin chagres
£20 for. Found a couple of others (e.g. Sowter)at similar or even higher
prices too.

Thanks for the input.

Yes well.. Souter won't be supplying Maplins!.....

Cheers


Ian

--
Tony Sayer

In article , Eeyore rabbitsfriendsandrel
writes


Ian Bell wrote:

Just got an email from Maplin to say they are out of stock of their one and
only type of mains transformer for tube supplies (250-0-259 @150mA and
6.3VAC secondaries).

Where else can I get something similar in the UK?

Sowter ?

Graham


Yes..

"The" transformer makers, been around yonks!, well since I started work
at Pye TVT and Rupert Neve & co!....

http://www.sowter.co.uk
--
Tony Sayer

tony sayer wrote:

Eeyore writes

Sowter ?

Yes..

"The" transformer makers, been around yonks!, well since I started work
at Pye TVT and Rupert Neve & co!....

Pye and Neve eh ?

Do you live in Cambridgeshire ?

Graham

Andy Evans wrote:
Sounds like this is for a preamp, and in this case Phil is right on
the button. A couple of toroids back to back are perfect. If you use
230 to 12v and 12v to 230 you can not only take 12v AC for the heaters
but also rectify it to -15vDC for a constant current sink if you're
using a differential pair. But allow for enough current capacity and
seperate the toroids to allow for some cooling - be careful to check
the result for overheating.



Yep, I have done that myself, but don't expect to get exactly 230v out
again, it will have two sets of copper losses.

Also, helpful though the idea is, I think the Maplin/Danbury TX's will
be cheaper than two toroids.

--
Nick

Sounds like this is for a preamp, and in this case Phil is right on
the button. A couple of toroids back to back are perfect. If you use
230 to 12v and 12v to 230 you can not only take 12v AC for the heaters
but also rectify it to -15vDC for a constant current sink if you're
using a differential pair. But allow for enough current capacity and
seperate the toroids to allow for some cooling - be careful to check
the result for overheating.

In article , Eeyore rabbitsfriendsandrel
writes


tony sayer wrote:

Eeyore writes

Sowter ?

Yes..

"The" transformer makers, been around yonks!, well since I started work
at Pye TVT and Rupert Neve & co!....

Pye and Neve eh ?

Do you live in Cambridgeshire ?

Graham


Yes Cambridge....

Born 'n bred

And Audix and Audiolab
--
Tony Sayer

On Jun 18, 9:30?pm, Ian Bell wrote:
Just got an email from Maplin to say they are out of stock of their one and
only type of mains transformer for tube supplies (250-0-259 @150mA and
6.3VAC secondaries).

Where else can I get something similar in the UK?

Cheers

ian

I believe Maplins swapped suppliers from Danbury to Oxford
Transformers OEP
http://www.oep.co.uk/index.html You should find their current range
there, though the Maplins one looks like a special. If you speak to
sales they may sell you something. Also be aware of Antrim
transformers who also used to supply Maplins with toroids. they have
some very interesting toroid outputs of the van der Veen type, like
Amplimo in the USA. They did unfortunately double their prices a
couple of years ago - I guess after losing the Maplins deal.
http://www.antrimtransformers.com/

http://www.transformersareus.co.uk/toroidals.htm Goldseal do good
prices on toroids.

On Tue, 19 Jun 2007 12:20:33 +0100, Nick Gorham
wrote:

Andy Evans wrote:
Sounds like this is for a preamp, and in this case Phil is right on
the button. A couple of toroids back to back are perfect. If you use
230 to 12v and 12v to 230 you can not only take 12v AC for the heaters
but also rectify it to -15vDC for a constant current sink if you're
using a differential pair. But allow for enough current capacity and
seperate the toroids to allow for some cooling - be careful to check
the result for overheating.



Yep, I have done that myself, but don't expect to get exactly 230v out
again, it will have two sets of copper losses.

Also, helpful though the idea is, I think the Maplin/Danbury TX's will
be cheaper than two toroids.

I don't think exact voltages are going to be any kind of an issue for
this project. He is setting currents to measure noise figure - if the
volts are a bit wrong he may lose some headroom, but I think they will
be "adequate" whatever he does.

d

--
Pearce Consulting
http://www.pearce.uk.com

Andy Evans wrote:

Sounds like this is for a preamp, and in this case Phil is right on
the button. A couple of toroids back to back are perfect. If you use
230 to 12v and 12v to 230 you can not only take 12v AC for the heaters
but also rectify it to -15vDC for a constant current sink if you're
using a differential pair. But allow for enough current capacity and
seperate the toroids to allow for some cooling - be careful to check
the result for overheating.

I found this on Farnell. It's a 1:1 capable toroid

http://uk.farnell.com/jsp/Electrical...sp?sku=3919997

Forget it, it's no longer stocked but it ought to be possible to get 1:1 types.

Graham