UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Valve Items - Philips/Mullard Rimlock-to-Noval Transition

kalee20 · 1st Sep 2019, 5:27 pm

One thing I have noticed between B8A rimlock, and B9A noval (and B7G), the pins of B8A valves are hard and stiff, whereas the others aren't.

I can see the need for pins that bend, if the valve is knocked sideways in the valveholder then the pins bend rather than the glass breaks. And B8A valves are supported by the skirt anyway so the force is not taken by the pins. But given that bendy pins would not detract from the valve in B8A, and given that the alloy had already been developed for B7G, what did B8A have rigid pins? Or was it just cheaper?

1st Sep 2019, 5:27 pm	#30
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,081	Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition One thing I have noticed between B8A rimlock, and B9A noval (and B7G), the pins of B8A valves are hard and stiff, whereas the others aren't. I can see the need for pins that bend, if the valve is knocked sideways in the valveholder then the pins bend rather than the glass breaks. And B8A valves are supported by the skirt anyway so the force is not taken by the pins. But given that bendy pins would not detract from the valve in B8A, and given that the alloy had already been developed for B7G, what did B8A have rigid pins? Or was it just cheaper?