That transformer is 81 mm in diameter.  I'm not sure it would fit.

-sonavor

Oops, sorry! That was the 50VA version. They also carry the 30VA transformer with 2x115V primaies:
https://uk.farnell.com/vigortronix/vtx-146-030-212/30va-toroidal-transformer-2x12v/dp/2817644

And it's available ex stock...and costs 10% less...and yet I wouldn't blindly buy it without measuring the real currents on the 10V and 24V windings first. I'm still sticking to my "better safe than sorry" motto I guess. 😕

Craig, I don't think it is worth trying to retain the multi-voltage selection if you go with an off-the-shelf transformer.
To retain the full BG4000 functionality (meaning including the original type neon strobe lamp) you will have to have some available AC voltage that gets you to the 180V ignition voltage for the neon bulb.

You won't have that with the 120 V option using those off-the-shelf transformers.
That is one nice thing about the LED strobe replacement.  It works off the 10 V secondary which is there for both 120 and 240.

I would just choose the best replacement transformer options for 240 V and if the turntable eventually gets sold to someone in a country with 120 V then the transformer will have to be updated (as well as the strobe lamp...unless the new transformer also supports it).

Otherwise you will have to likely have a custom transformer made the fits the available dimensions, has 120 and 240 volt primaries, has a 180-220 V secondary, a 24 V secondary and a 10 V secondary.

Decisions, decisions, decisions :-)

-sonavor

The transformer I was looking at was indeed the 30VA version VTX-146-030-112 with an output current of 1.25A. Its only a single primary voltage transformer with a diameter of 74mm, I will check this evening but I think it may just squeeze into the footprint of the existing unit. I don't want to retain the multiple input voltage selection...just the switch, removing the switch and fuse box leaves a hole in the bottom that will require blanking off somehow.......not a massive issue I know, but if I can avoid it I would like to do so.....I will perform the measurements Manfy has identified and base the decision on the findings.

Either way it looks like we have a cost effective way forward, thanks gents 😕 

Oh and I did contact Canterbury Windings yesterday...an elderly chap answered the phone and advised me he was indeed the man responsible for such work but at the age of 70 had decided to draw the stumps....another loss which most likely will never be recovered. 

Just to recap on the secondary voltages required....the secondary AC output voltage to the bridge rectifier 0D1 under no load was almost 32vac for the 24vdc supply

The secondary AC output voltage to the bridge rectifier 2D5 under no load was almost 9.5 vac for the 6.0 vdc supply.....will 2X12 vac outputs be good for these requirements?......I dont see an issue for the 6vdc supply but I'm not sure about the 24 vdc supply?

Craig wrote:

I don't want to retain the multiple input voltage selection...just the switch, removing the switch and fuse box leaves a hole in the bottom that will require blanking off somehow.......not a massive issue I know, but if I can avoid it I would like to do so.....

Thanks, now I get it. It's a combined fusebox/selector switch. Yes, I would want to keep the switch too...just for the optical appearance from the outside.
If I had to do the same thing, I'd probably first think of digging out my Dremel... 😎

Craig wrote:

Oh and I did contact Canterbury Windings yesterday...an elderly chap answered the phone and advised me he was indeed the man responsible for such work but at the age of 70 had decided to draw the stumps....another loss which most likely will never be recovered.

Sad indeed, but fret not!
What would you say to a custom toroid with 230V primary, 40VA, 1x9V/0.5A sec, 1x24V/1.5A sec, including thermofuse, magnetic and electrostatic shield, diameter 75mm, height 35mm, incl. mounting accessories and made in EU.
...and all that for my special Chinese New Year offer of only EUR49.??  🤩  GongXi GongXi!

I think that's an incredibly good offer and if I needed one, I'd order it right away! You can configure it any whatsoever way from this French supplier:

https://www.audiophonics.fr/en/toroidal-transformers/custom-toroidal-transformer-all-power-p-3675.html

And if you don't want to use a Dremel on the fusebox, you have an even better choice: Get a 30VA R-coil transformer 2x115V, 2x12V/1.25A incl. magnetic and electrostatic screen, size: 78x70x40mm for an incredible 25.- Euros! 👍
(In case you're unfamiliar with R-core, it's a squarish toroid with a number of benefits over simple toroids: less capacitive coupling, even less flux leakage due to rounded cross section, etc.  ...some Audioholics even claim that it is the holy grail in the audio industry... 😐

https://www.audiophonics.fr/en/r-core-transformers/r-core-transformer-30va-2x12v-p-8539.html

Manfy

The 30VR R Coil looks a very good option.....I have attempted to buy one from the audiophonics website, however it says I need a minimum order value of EU160....I have sent them an email asking if I can have just one

Craig wrote:

The secondary AC output voltage to the bridge rectifier 2D5 under no load was almost 9.5 vac for the 6.0 vdc supply.....will 2X12 vac outputs be good for these requirements?......I dont see an issue for the 6vdc supply but I'm not sure about the 24 vdc supply?

Don't worry about it. Sonavor has already confirmed that his custom-made toroid works fine with V0=24.1V and Vload=20.5V at 1.5A. And he's been running that Beogram for years now.

In fact I'd see such a high idle voltage as more problematic than helpful. At 32Vrms you'd see 45Vdc after the rectifier. That means that 0TR1 has to burn (45V - 24V) *2A = 42W at 2A load current and that's not good.
In most transformer specs the nominal voltage is the voltage at nominal current, which in turn means that the idle voltage will always be a bit higher. Just pick 24Vrms as your nominal voltage when picking the transformer and it should be fine.

Another word to my previous post: please read my statement "made in EU" as "sold in EU". 😳
I just read some reviews on that site and it suggests that the toroids are made in China -- which is not surprising at that price.
Additionally, one buyer complained that the actual size was different from the initially ordered size. That tells me, if you decide to order a custom-made toroid there, don't just do that online. Email them before placing order and make sure they understand your stringent size requirements. That'll help to avoid disappointments and unwanted costs.

Craig wrote:

Manfy

The 30VR R Coil looks a very good option.....I have attempted to buy one from the audiophonics website, however it says I need a minimum order value of EU160....I have sent them an email asking if I can have just one

Sorry to hear that!  ...damn Brexit! 😭 ...damn you, BoJo! 😎 😂

This also looks promising from RS....