Sophia electric 274b Aqua a direct replacement for the 5U4G Bulb?

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  • Jr. Member
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Guys I have the Purity audio 300 B Mono  blocks and want to try these  but do not want to damage the amps- Since Purity is no longer around I can not ask them if it will work- any thoughts- thanks

Rusty Jefferson

  • Full Member
  • Posts: 399
The 274b is not a direct replacement for 5u4G. It's a 2 amp filament rather than a 3 amp filament.  It might work fine, but it's not a direct replacement.

274b is an equivalent for 5r4. If your amp(s) can use 5r4, then you can use it.