Classic Dynamo and Regulator Conversions Ltd

15/09/2026

Hi people😃

Here at Classic dynamo, I'm always looking to buy regulators for restoration and conversion. Right now, I am buying Lucas RB310 units with screw or spade terminals. If you have anything available, please let me know in the comments or send me a message.

Have a look in your garages or workshops please.

They don't need to work but they do need to be in a good straight restorable condition.

15/09/2026

Another great Beaulieu International autojumble has been and gone. Great to meet some of you and I hope you found everything you were looking for. You know the saying.........."If you can't find it at Beaulieu, it probably doesn't exist!"

Here's a video of what you missed if you didn't go...........

For more information: https://www.beaulieu.co.uk/Feel free to fol...

10/09/2026

Hope to see some of you at the Beaulieu International Autojumble this weekend, 12th/13th September.

As usual, we're in RED field, plot 117 😃

Come and say hello. I'll have our complete range of LED products, D lamps, Pork Pie lamps, L549's and of course my electronic versions of the Lucas RB106 and RF95.

I'll also have a selection of overhauled/rebuilt dynamos inc. Smiths units for Bentley etc. Come and have a look.

15/07/2026

Calling all post war Rolls Royce and Bentley owners.

Rolls Royce and Bentley cars fitted with lucas SFT576 foglights (RR part number UD2202).

Rolls Royce used them as a combined foglight and indicator with the 409 bulb (RR part number UD2499).
Used in the mass produced Rolls Royce and Bentley post war cars, Phantom V, S1, S2, SC1 and SC2.

Is there any interest in an LED version of this bulb???
One yellow beam for the fog lamp and an amber light for flashing indicators.

I may well look into having a batch made if there is enough interest from owners. Are there at lease 50 people out there that would buy an LED version of the now expensive filament bulb

14/07/2026

Just a reminder of the damage an over tight drive belt can do.
This commutator end bush was new just 150 miles ago.

1" (25mm) up and down movement in the longest run is all that's required. Too tight and the thrust will knock an oilite bush out very quickly. You also risk damaging the armature shaft.

12/06/2026

Something I see often with pre war Rotax dynamos is a cracked (and often repaired) brush ring.
Most that come into the workshop are like this.

The ring holds the brush boxes which are adjustable for optimum output. If they break, the brushes move around and the ring comes off, on to the commutator and can cause damage.

The answer?

CNC a replacement from billet aluminium and improve it at the same time. I had a batch made some 10 years ago.
They are made thicker in the area that they always crack.

I always replace them if they are broken, repaired or corroded.

Another great improvement from Classic Dynamo 😀

13/05/2026

Our LB9 light board is one of our best selling LED light boards as it gives an amber indicator through a red lens on many wing mounted rear lamps such as the Lucas 549.

People ask me if it can be used on cars currently fitted with a Lucas DB10 relay which flashes the brake light as an indicator.
Not ideal on modern roads as many only recognise an amber flashing light as a turn signal.

The answer is YES 😀 With just a few easy alterations you can have amber flashing indicators through a red lens.

I've put together some simple instructions and a diagram to show you how to do it.

https://www.dynamoregulatorconversions.com/the-cdrc-online-shop.php #!/LB9-Stop-tail-and-Amber-Indicator/p/613320594

09/05/2026

My apologies for the lack of “On the bench today” posts of late. Our sheer workload has kept me in the workshop with very little time to post about the things we do 🙂

I always take pics of the dynamos we rebuild and repair and the regulators and cut outs I convert.

Here’s a pre war Lucas cut out that came in burnt out. Totally overhauled and converted to a solid state cutout. All connections remain the same. Not a big fat diode, but a cleverly thought out and protected system that works perfectly 👌🇬🇧

08/05/2026

You know and trust our 12v ULTIMATE H4 LED headlamp bulbs. People often ask if they’re available in 6v.

Well now they are 😀👌

Introducing the 6v ULTIMATE H4 LED headlamp bulb.
As with the 12v version, it’s perfectly designed and made to give focused beams, right where you need them 😀

Perfect for any 6v car or motorcycle 🙂

In our online shop now.

https://www.dynamoregulatorconversions.com/the-cdrc-online-shop.php #!/6v-P43t-H4-LED-Dipping-Headlamp-Bulbs-Classic-White-3000k/p/834500272

30/03/2026

If you need ST51 D lamps or ST38 Pork Pie lamps for your classic,, we have them made. We don't buy them in from someone else who has already put a mark up on them. We also stock a range of spare parts for them and all at down to earth prices 😃

Great quality units in black enamel or chrome........ https://www.dynamoregulatorconversions.com/the-cdrc-online-shop.php #!/ST51-D-Lamp-Early-Type-Split-Lens/p/101835329

Our LED conversion light boards that give a light that's brighter than a bulb but shines like a bulb, unlike others that have the LED chips right behind the lens so you can see every individual chip.

We also stock Lucas L549 rear lamps which take our direct replacement LED stop/tail bulbs, OR you can easily fit our rather special LB9 light board that gives you stop/tail AND an amber flashing indicator through a red lens.

Perfect for adding hidden indicators 😃