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What are the best current production 5U4G?What are the differences between 5U4G rectifier tubes and 5R4?
Follow Ups:
the 5R4 max cathode current is 650 ma and the 5U4G's is 800ma. The 5R4's PIV is 2800v whereas the 5U4G's is 1550v. The 5R4's voltage drop at 250ma is 67 volts but the 5U4G's is 44 volts at 225ma.this stuff is all easy to find at:
http://tdsl.duncanamps.com/not trying to be a smarta** or anything, but why do you need current production stuff when actual NOS RCA's or GE's or Sylvania 5Ur's are dirt cheap? Are you just curious?
I was curious about the current production 5AR4's and so I bought a quad of the JJ/Tesla ones just to see how they stacked up against the Mullards that I have. They're actually pretty good.
I never thought about the current production 5U4 tubes. If you get some, give us a report about how they sound, look, build quality, etc. thanks in advance,
roN
Current production Chinese and Russian 5U4Gs are GUANO.The only current production 5U4 that might be acceptable is the Russian 5U4GB, which come on stream a couple of years ago.
The recommendation to buy US made NOS is CORRECT. TungSol, RCA, and GE 5U4GBs are still affordable, good sounding, and long lasting.
Eli D.
all of that, especially the long lasting part. I have a GE floor radio (H-87) that uses two 5U4's in the power supply. The thing used to STAY on all the time at my grandparents house. Those tubes have 10,000+ hours on them and they still test strong.I think if a tube guy buys a few 5U4's (oh, say 10 or 12) he will likely have a life time supply. I recommend RCA's or Sylvanias.
Mullard 5AR4's last forever too. I have the old Bogen M60 PA amp that we used to use in our church. Only God knows how many hours are on those original Mullard 5AR4's but they still are strong testing tubes.
gotta love em
20+ years of HARD service is common with Mullard made GZ34/5AR4 rectifiers.
Eli D.
These are very rugged tubes. I got some used RCA 5R4GY brown base ST's for $5 each, they work fine.
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