UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Bush DAC90A valve holders

Herald1360 · 3rd Nov 2019, 10:52 am

The only places I'd leave old waxies are where the circuit impedances are low enough that dc conditions are not affected. Cathode bypass is about the only such in a DAC90(A).

This isn't very spring related!

I wonder whether the spring design went with the early metal base valves where it wouldn't do any harm and may have been a nod to high vibration applications. When the bean counters decided that all that metal was expensive, it took a while for the sockets to follow suit? Presumably sockets were never manufactured by the valve makers anyway. Except maybe Philips?

3rd Nov 2019, 10:52 am	#14
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Bush DAC90A valve holders - a basic question The only places I'd leave old waxies are where the circuit impedances are low enough that dc conditions are not affected. Cathode bypass is about the only such in a DAC90(A). This isn't very spring related! I wonder whether the spring design went with the early metal base valves where it wouldn't do any harm and may have been a nod to high vibration applications. When the bean counters decided that all that metal was expensive, it took a while for the sockets to follow suit? Presumably sockets were never manufactured by the valve makers anyway. Except maybe Philips? __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O Last edited by Herald1360; 3rd Nov 2019 at 10:58 am.