U18/20 Osram helix top mica black rugged plate full mesh getter Holy Grail audio valves
Osram U18/20 Helix top mica £ 550 pair.
Osram U18/20bHelix top mica £ 1,000 quartet.
Description
We have a good batch of Mullard U18/20 here at Audio Magical then it is up to you want you want to choose.
Quartet of super rare Osram U18/20 with black rugged plate and full getter.
These are really TALL valves, the envelope is about 8-9mm taller than a standard U18/20!
Top mica is HELIX shape, that makes them as rare as hen’s teeth. You do not see as many on any website.
The U18/20 is a medium power full wave rectifier.
The reservoir capacitor is 16 μF.
The quartet U18/20 has been tested and it is in perfectn working order.
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