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Workshop Finding Philips (Mullard) VDRs

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irob2345
(@irob2345)
Posts: 566
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Topic starter
 

Anyone know where you can source Philips VDRs?

There are 3 types I'm interested in, they are all coated beige (at least the Oz made ones were) and about the size and shape of a 1 watt resistor with different colour end bands.

Back in the day (late 60s, early 70s) we knew them as:

Blue band - used mainly for height voltage regulation and also as..

Green band - used across the vertical output transformer primary as protection (in case the vertical yoke connection was unplugged or went o/c).

Blue-Black band - used in line stabilization circuits.

There has to be a Philips data book that covers these, with a long Philips part number, but I've been unable to find it.

Anyone?

 
Posted : 05/11/2023 5:12 am
crustytv
(@crustytv)
Posts: 11905
Vrat Founder Admin
 

I've a few of these different types in stock, but not enough to move any on. As for sourcing them, look on eBay, that's where mine came from, it just takes time for them to crop up but they do.

I don't know about Philips books, but they are fully covered in the Mullard Technical Handbook, Book 3, Components and Materials. There is comprehensive data about them within.

They were known as the E298 series.

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Posted : 05/11/2023 7:10 am
irob2345
(@irob2345)
Posts: 566
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Topic starter
 

Thanks mate!

Mullard = Philips (pretty much), or Elcoma as their components division was known as in Oz.

You've given me the information I needed.

 
Posted : 05/11/2023 8:55 am
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