240/220 volt stepdown tx

[struth]

required to run one of my valve amps with..or something along similar lines. or if anyone can make one.
cheers

[NRG]

Talk to these guys:

http://www.airlinktransformers.com

[struth]

thanks for that, but dont see anything suitable on there list....probably some sort of bucking tx system may be the answer...dont want a transformer the size of a block of conny.....:lol:

[NRG]

They can make custom transformers you asked "or if anyone can make one"...

[montesquieu]

Not a transformer but if you buy the correct power conditioner you can achieve what you want relatively easily.

My voltage runs generally around 247 or thereabouts most of the time, by my PowerInspired regenerator (originally intended to attach to a UPS but used by lots of people for hifi) puts out a steady 230v, well within the margin for a 220v component.

This works (as far as I can see) on similar principles to expensive PS Audio gear .. early PS Audio gear also used transformers but the Power Plant Premier moved to a different system which was much lighter and far cleverer compared to the brute force of a transformer, anyway IIRC with anything from a PPP upwards you can dial in the output voltage you want to see.

[struth]

they are a touch pricey for me...was hoping for something homemade cheapish...maybe 50/60 quid. Thought some of the clever guys on here could have one or maybe built one.

[montesquieu]

they are a touch pricey for me...was hoping for something homemade cheapish...maybe 50/60 quid. Thought some of the clever guys on here could have one or maybe built one.

Not being a DIY guy myself but having commissioned a fair few bits ... decent metal case is probably in the £30-40 range then you add shipping costs, you've hit your budget before you've bought any transformers or other internal bits. I suspect you'd be looking at more like £100+ all up.

[Firebottle]

What is the power consumption of your amp?

:cool: Alan

[struth]

I will go with the rating of the yaqin as it is rated at 280watt.

[Firebottle]

Pity, I have a variable transformer you could have had but it`s only 200W.

:( Alan

[struth]

OK...cheers..it is probably a bit less but there is no info as to its power consumption so I erred on the side of safety and used the consumption on my yaqin who's transformers a way bigger.

[Firebottle]

What is the amp Grant?

[struth]

Its an AUDIOROMY 828A using fu29 output valves. Same one as in my avatar. Doubt it will be as much as the big yaqin but cannot find any specs on it for power consumption

[struth]

I have taken a magnifying glass to the back and found a very small mark say its 250watt, which is surprisingly high for it size so that puts your tx out of the picture..thanks again....the search continues.

[Firebottle]

I`ve found a page that quotes 160W ?
http://techandgadgets.tumblr.com/post/19400885274/audioromy-m-828a-fu29

I`ve seen the 250W printed on the back, I wonder which it is?

:cool: Alan

[struth]

interesting question...might depend on the input voltage and model...i think the newer ones were uprated and this one is only a month or 2 old I think.sure I read something about the tx's packing up on the older ones and that they were uprated..
They sound terrific by my ear and noticed the valves do have a high heater voltage so that might be the reason they glow so much.

I would imagine that article was referring to a 110v version which would correlate with the current stated at the output valves..double the voltage and double the wattage I think..

[Mr Kipling]

It's listed elsewhere at 160w.

Google Audiromy FU 29 and there's a dealer on Facebook selling it and gives a figure of 160w. And it is still available on eBay. Or it was the last time I looked.

[struth]

I see that Stephen on a few things I have read, but it definately says 250 watt on the back plate, so, who knows. as I said the 160 watt versions may be the us versions and the info has been copied wrongly....it says 220v 250 watt beside the ac input...
or of course it could have been printed wrong on the amp...they are chinese so anything is possible in translation etc.

[Mr Kipling]

Thinking about it, I have a wattmeter somewhere and if I can find it at the weekend I'll plug my Audioromy in and see what comes up.

[struth]

If I cannot find a solution I will rebox it and keep as a spare amp I think

[Mr Kipling]

Well, plugging my Audioromy in to the wattmeter gave a reading of just 113w. I plugged my iron (domestic) in just to check the meter and got a reading of 1444w so the meter appears to be ok.

[struth]

well, that's a lot less than any of the quotes..well done:)....now we know what it draws under normal conditions...think that 200 watt variable tx would do nicely.

[Firebottle]

I`ve taken a couple of pics of said variable transformer. This particular one is rated at 150W, I don`t have the 200W rated one with me at the moment.

http://i601.photobucket.com/albums/tt97/Paramotorpilot/P1030662.jpg

The variable contact is shown set for 220V output with about 245V input, in line with the triangular `flash` sticker.
You will need to put it into a box of some sort to make it safe, an earthed box if it is metal of course.
Input is on the brown (L) and blue (N) wires with free ends, be sure to include a fuse in line.
Output L is on the spare tag of the overcurrent trip (black rectangle in the picture), output N is the other blue wire with tag.

http://i601.photobucket.com/albums/tt97/Paramotorpilot/P1030663.jpg

This shows the mounting screws on the front face.

You are welcome to it for ths cost of the postage, packed weight will be about 1.5Kg.

:cool: Alan

[struth]

that would be great Alan, will send you a pm.

[struth]

Finally got all the gear together for this project so will advise when I get it built ..
it has been a while but health has stopped me.

[lurcher]

Either ask Terry at Canterbury Windings to wind you a transformer or an autoformer, or make one using a 18v Toroid. Depends how "official" you want to be.

[struth]

hopeful this variable will do the trick, and need a task to keep me occupied so will have a go. the tricky bit will be cutting the holes in the plastic case without cracking it. if not then I will try one of your suggestions Nick.

[lurcher]

Yep, sorry, I answered without seeing you already had a solution.