274B / 5U4G
5U4G / 5U4GB upgrade to 274B: YES, DO IT!
Most Chinese tube manufacturers now produce upgrade / high end rectifier tubes under 274B model, which has 100 times (yes that is 100x!) improved vacuum inside the glass bulb compared to 5U4G, ensuring a longer healthier tube life!
274B tube requires 2.5A filament current, which is lower than 3A filament current required by 5U4G. It is safe to use upgrade a stock 5U4G / GB tube to high end 274B varieties. You may also see some Chinese amps use 5Z3P rectifier tube – it can be replaced by 274B.
Please note most 274B have a larger glass enclosure – similar size to a 300B tube. If your amp has a tight clearance around tubes, please check it before ordering 274B tubes in place of 5U4G.
5AR4 / GZ34 vs. 274B: NO, DON’T DO IT!
A 5AR4/GZ34 requires 1.9A filament current. To replace 5AR4 or GZ34 with 274B, you MUST consult your amp manufacturer to make sure the increase of filament current from 1.9A (for 5AR4/GZ34) to 2.5A (for 274B) can be tolerated by the amps power supply before swapping the tubes!
Showing all 6 results
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Linlai™ Global E-274B vacuum tubes (pair or single)
From: US $285.00 Select options -
Linlai™ Global WE274B Western Electric Replica Tubes (single)
From: US $215.00 Select options -
Linlai™ Global 274B-D ‘egg shaped’ vacuum tube (single)
From: US $185.00 Select options -
Linlai™ Global 274B-T2 ‘black bottle’ vacuum tubes (single)
From: US $175.00 Select options -
Linlai™ Global HiFi 274B vacuum tubes (single or pair)
From: US $99.00 Select options -
Linlai™ Global HiFi 5U4G vacuum tubes (single or pair)
From: US $74.90 Select options