UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 5FP7 project starting with the focusing coil.

AdrianH · 9th Oct 2021, 10:58 pm

Thanks for the suggestion Dalek I will have a look at them, the magnetic control I seem to remember using in an old welding set many years ago, at least I think it used that principle.

I do have a Velleman kit PWM controller that has a blown output device. I was going to get that fixed and see if the frequency is fast enough to drive a LOPT and get HT that way.

But I would really like to build it all with a valve if I can using one as a RF osc placing it all in a screened box. Well that's the plan at present, it just takes time, patience and brains, I am starting to get in short supply of two.

Adrian

9th Oct 2021, 10:58 pm	#9
AdrianH Octode Join Date: Mar 2020 Location: Blackburn with Darwen, Lancashire, UK. Posts: 1,572	Re: 5FP7 project starting with the focusing coil. Thanks for the suggestion Dalek I will have a look at them, the magnetic control I seem to remember using in an old welding set many years ago, at least I think it used that principle. I do have a Velleman kit PWM controller that has a blown output device. I was going to get that fixed and see if the frequency is fast enough to drive a LOPT and get HT that way. But I would really like to build it all with a valve if I can using one as a RF osc placing it all in a screened box. Well that's the plan at present, it just takes time, patience and brains, I am starting to get in short supply of two. Adrian __________________ Asking questions and learning, or trying to! Youtube EF91Valve