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Author Topic: Valiant LV choke burned up.  (Read 4369 times)
KE3WD
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Posts: 5694




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« Reply #15 on: May 05, 2013, 06:00:18 AM »

Seperate fuses could be costly in the event you lose the plate supply and the screens are still powered . Perhaps a better scheme would have the fused circuits also tied to relays that would drop all power if any one of the fuses opens .

That scheme seems pretty "involved" and alters the old boat anchor considerably, not to mention that each set of relay contacts/relay drivers is yet another failure point waiting to happen. 

The old girl lasted how many years with just the one fuse? 

I think that with good reliable troubleshoot and repair techniques, that I would just leave well enough alone. 

YMMV


73
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N2EY
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Posts: 3877




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« Reply #16 on: May 08, 2013, 08:10:53 AM »

Seperate fuses could be costly in the event you lose the plate supply and the screens are still powered .

Aren't the screens powered by the same B+ that powers the plates? If not, what happens if you lose a rectifier?

IIRC, in the Valiant and the Viking 2, as well as many other BA rigs, the final plate transformer is only on when in transmit, while the low-voltage, bias, filament transformer is on whenever the rig is on. So the problem has already been addressed.

73 de Jim, N2EY

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