Quote:
Originally Posted by ZenithNut
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First one you may want to put 2-3 in series to ensure against HV spikes/arcover causing it to short, but otherwise it seems fine.
The second diode looks like a common 1N4007 should be a sub for it.
In most tube circuits the important specs for the replacement diode to match or exceed are PIV (peak inverse voltage) and average forward current. The rest usually makes little difference.