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Mains Transformer for tubes - suppliers in UK
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 -- Pearce Consulting http://www.pearce.uk.com |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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. Cheers Ian |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
Ian Bell wrote:
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 can get what Maplin sold and more from http://www.livinginthepast.demon.co.uk -- Nick |
Mains Transformer for tubes - suppliers in UK
"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! |
Mains Transformer for tubes - suppliers in UK
"Ian Bell Boy Idiot " 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? ** For a one off project - use two AC transformes. The first supplies the valve heaters while the second operates in reverse from the output of the first to supply the HT voltage. Eg: Tranny 1 = 240 volts to 9 volts (then rectified and regulated to give 6.3 DC ) Tranny 2 = 12 volts to 240 volts ( rectified to give 250 volts DC approx ) NOTE: Tranny 2 needs to have a somewhat higher secondary voltage to avoid high magnetising currents when operated in reverse. ( This does not apply to a toroidal transformer ) ........ Phil |
Mains Transformer for tubes - suppliers in UK
"Ian Bell Boy Idiot " 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? ** For a one off project - use two AC transformers. The first supplies the valve heaters while the second operates in reverse from the output of the first to supply the HT voltage. Eg: Tranny 1 = 240 volts to 9 volts (then rectified and regulated to give 6.3 DC ) Tranny 2 = 12 volts to 240 volts ( rectified to give 250 volts DC approx ) NOTE: Tranny 2 needs to have a somewhat higher secondary voltage to avoid high magnetising currents when operated in reverse. ( This does not apply to a toroidal transformer ) ........ Phil |
Mains Transformer for tubes - suppliers in UK
"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? Hammond have their European HQ in the UK. Danbury is a cheaper UK maker. Sowter are top of the league - highly recommended. Iain |
Mains Transformer for tubes - suppliers in UK
Nick Gorham wrote:
You can get what Maplin sold and more from http://www.livinginthepast.demon.co.uk Many thanks Nick. A truly excellent site. Bookmarked! Cheers Ian |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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. |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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. |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
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 |
Mains Transformer for tubes - suppliers in UK
Andy Evans wrote: 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. http://www.amplimo.nl/index.html?lan...arget=d19.html Priced in Euros. Graahm |
Mains Transformer for tubes - suppliers in UK
Eeyore 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. 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 The only UK source for low vol 1:1 I have found is http://www.antrimtransformers.com/ But in this case, the 1:1 doesn't also supply the heater voltage which two back to back 230v:6v TX's would do. -- Nick |
Mains Transformer for tubes - suppliers in UK
On Tue, 19 Jun 2007 13:37:37 +0100, Nick Gorham
wrote: Eeyore 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. 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 The only UK source for low vol 1:1 I have found is http://www.antrimtransformers.com/ But in this case, the 1:1 doesn't also supply the heater voltage which two back to back 230v:6v TX's would do. I always found that for making low signal measurements on tubes it was a good idea to supply the heater from a battery. Did away with all sorts of mains hum nasties. No good for a final design, of course - but that's another question. d -- Pearce Consulting http://www.pearce.uk.com |
Mains Transformer for tubes - suppliers in UK
"tony sayer" wrote in message ... 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 When I had just started work in 1971, I visited Dr Sowter to discuss with him some transformers I needed for the designs I was doing at work. I thought I knew something about transformers, but very soon found out that I didn't know 1% of what there was to know. Lovely man, already in his '80s at the time, but as sharp as they come. He was gracious with a beginner, and I learnt an awful lot. The business is still carried on by the family, it may now be his grandson in charge. In the mid '80s, I designed and built a 100 watt valve amplifier for fun, using Sowter mains transformers, mains chokes and output transformers. Although I didn't visit them that time, again nothing but helpful suggestions and advice. Lovely company. Still have a few of their 10k input bridging and 600 ohm output transformers. S. -- http://audiopages.googlepages.com 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 |
Mains Transformer for tubes - suppliers in UK
On Jun 19, 1:34?pm, Eeyore
wrote: Andy Evans wrote: 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. http://www.amplimo.nl/index.html?lan...arget=d19.html Priced in Euros. Graahm Of course! I was thinking of Plitron in the USA who also do the same type of toroid outputs. Andy |
Mains Transformer for tubes - suppliers in UK
Andy Evans wrote:
Sounds like this is for a preamp, it is. 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. Yes, I have seen that configuration used before. I made the mistake of assuming I needed 6.3 AC secondaries which makes them just as hard to find in the UK. However, using say 9V means I can rectify and regulate dc for heater. Nice idea - thanks Phil. Ian |
Mains Transformer for tubes - suppliers in UK
Andy Evans wrote:
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. I made that connection too from the Maplin web page description, but OEP mains transformers are up in the £70 range. 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/ Looks good, thanks. http://www.transformersareus.co.uk/toroidals.htm Goldseal do good prices on toroids. Looks like their minimum order is 100. Ian |
Mains Transformer for tubes - suppliers in UK
On Tue, 19 Jun 2007 17:07:58 +0100, Ian Bell
wrote: http://www.transformersareus.co.uk/toroidals.htm Goldseal do good prices on toroids. Looks like their minimum order is 100. Ian Give them a call and ask who distributes, and can supply you with one. Chances are they will have some way of supplying you direct. d -- Pearce Consulting http://www.pearce.uk.com |
Mains Transformer for tubes - suppliers in UK
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Mains Transformer for tubes - suppliers in UK
"Chris Isbell" wrote in message ... On Tue, 19 Jun 2007 13:31:00 GMT, (Don Pearce) wrote: I always found that for making low signal measurements on tubes it was a good idea to supply the heater from a battery. Did away with all sorts of mains hum nasties. No good for a final design, of course - but that's another question. Agreed. A lead-acid accumulator is much better. ;-) This brings back fond memories of my Beethoven Portable radio. This had valves to die for and was powered from batteries - one for the HT and a 'grid bias' battery which supplied around five different voltages. The output valve had a terminal on the top (from memory, the anode) in addition to the terminals at the base. It was around 15cm tall. Last time I saw the Leicester Invester he had a big pile of bright yellow industrial batteries that he intended to use to run a valve amp..??? |
Mains Transformer for tubes - suppliers in UK
Chris Isbell wrote:
On Tue, 19 Jun 2007 13:31:00 GMT, (Don Pearce) wrote: I always found that for making low signal measurements on tubes it was a good idea to supply the heater from a battery. Did away with all sorts of mains hum nasties. No good for a final design, of course - but that's another question. Agreed. A lead-acid accumulator is much better. ;-) This brings back fond memories of my Beethoven Portable radio. This had valves to die for and was powered from batteries - one for the HT and a 'grid bias' battery which supplied around five different voltages. The output valve had a terminal on the top (from memory, the anode) in addition to the terminals at the base. It was around 15cm tall. Thats annoying, I am now trying to find what the battery output valve was with a top cap. I am thinking of the likes of PT15 or 807, but neither of those are "battery" valves. -- Nick |
Mains Transformer for tubes - suppliers in UK
"Nick Gorham" Thats annoying, I am now trying to find what the battery output valve was with a top cap. ** The 1B8-GT was popular in battery portables. http://www.nj7p.org/Tube4.php?tube=1B8GT ........ Phil |
Mains Transformer for tubes - suppliers in UK
Phil Allison wrote:
"Nick Gorham" Thats annoying, I am now trying to find what the battery output valve was with a top cap. ** The 1B8-GT was popular in battery portables. http://www.nj7p.org/Tube4.php?tube=1B8GT ....... Phil Ah, yes, that would make sense, single ended pentode output stage. Thanks Phil. -- Nick |
Mains Transformer for tubes - suppliers in UK
In article i,
Iain Churches wrote: It also has a three-position preset tone control marked "Speech", "Music" and "Jazz" :-) My parents had a radiogram where the tone controls were labelled 'bass' and 'brilliance' They were rotary switches rather than pots and appeared to be high pass and low pass filters only - no boost. Wonder when Mr Baxandall produced his near universal design? (My spool cheeker didn't recognise Baxandall so knowing you picky lot I did a Google on 'baxandall tone control'. And the first hit was pages written by 'our own' Jim Lesurf...) -- *Fax is stronger than fiction * Dave Plowman London SW To e-mail, change noise into sound. |
Mains Transformer for tubes - suppliers in UK
On Jun 18, 3:30 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 bet any of a dozen wind houses there will wind you one but it's probably cheaper to buy out of a catalog. Must be a bunch of vendors. A PT for a Fender Deluxe is in that ballpark but 600 vct rather than 500. |
Mains Transformer for tubes - suppliers in UK
Bret Ludwig wrote:
On Jun 18, 3:30 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 bet any of a dozen wind houses there will wind you one but it's probably cheaper to buy out of a catalog. Must be a bunch of vendors. That's what I thought but Google doesn't seem to turn them up . Ian |
Mains Transformer for tubes - suppliers in UK
If you're going toroid have a custom wind done. It's not much more
expensive, whereas with EI types there's a big price difference. |
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