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Funny, about a week ago I got the Grundig working and I pulled out the ancient NiCad rechargeable A supply cell and replaced it with a 4700uF cap. In addition to the hard wired in NiCad it had battery clips for installing a standard off the shelf D cell. I figured out the D cell does okay voltage regulation (slowly climbs over a few minutes).
Instead of the diodes I'm going to hunt down a modern NiCad cell and replace the original.
The set had no audio initially because the NiCad in it had leaked and corroded the AC mode output tube heater ground open. This set interestingly has 2 single ended output stages because so it can have loud output on AC and low power consumption on battery...I had only seen that on 40s american sets till now.
Besides those issues it only had a handful of bad lytics.
Till I get another NiCad I plan to run it off batteries primarily.
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