UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

julie_m · 30th May 2019, 10:38 pm

Nicely, nicely, Sporty Spicely!

I like it when practice agrees with theory; it means the theory must have been right!

In the UK, 4kΩ was REN=1 and a line is guaranteed to support up to REN=4, so your 3650Ω was not far off at all. The voltage ratio of your transformer was about 6:1, so we'd be looking at a 20-0-20 mains transformer. That's an unusual value; 18-0-18 or 24-0-24 would be the nearest likely available (lower voltage ⇒ lower power ⇒ lower REN).

30th May 2019, 10:38 pm	#22
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Incorrect bell? Nicely, nicely, Sporty Spicely! I like it when practice agrees with theory; it means the theory must have been right! In the UK, 4kΩ was REN=1 and a line is guaranteed to support up to REN=4, so your 3650Ω was not far off at all. The voltage ratio of your transformer was about 6:1, so we'd be looking at a 20-0-20 mains transformer. That's an unusual value; 18-0-18 or 24-0-24 would be the nearest likely available (lower voltage ⇒ lower power ⇒ lower REN). __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.