Nick Lehman
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- Nov 27, 2013
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Picked up a quad of old Sylvania 5U4GB from eBay and received them today.
They look to be in great shape and were all tested prior to selling.
My question is about the number of pins. I have only seen 4 & 5 pin 5U4's and one of these has all 8 pins like a power tube. I assume its no big deal but want to know for sure before I put it in my Triple Rectifier.
Did a quick search on Google but can't find much information regarding this 8 pin version. It looks identical to the others but all 4 of them have different markings on the bases. They all have the "5U4GB" stamp on the glass and seem to have the same construction.
The three 5 pin tubes have a halo getter but the 8 pin tube has a rectangular or "D" shaped getter.
Any info would be helpful, Thanks.
They look to be in great shape and were all tested prior to selling.
My question is about the number of pins. I have only seen 4 & 5 pin 5U4's and one of these has all 8 pins like a power tube. I assume its no big deal but want to know for sure before I put it in my Triple Rectifier.
Did a quick search on Google but can't find much information regarding this 8 pin version. It looks identical to the others but all 4 of them have different markings on the bases. They all have the "5U4GB" stamp on the glass and seem to have the same construction.
The three 5 pin tubes have a halo getter but the 8 pin tube has a rectangular or "D" shaped getter.
Any info would be helpful, Thanks.