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In Reply to: RE: Tube comparisons? posted by Jeff Day on August 02, 2012 at 05:31:07
Jeff,
I don't know of comparisons, but I have a thought to share.
A 274B is a really expensive rectifier tube. It could EASILY be bested by running two common directly heated rectifier tubes like ten dollar 5U4Gs and / or 5V3 As, with closely matched sections. Two of either should really WHOMP performance-wise, a single 274, and at about 10 % the cost !!
Is your audio goal running a status tube, or just plain ole all-out audio performance ??
Jeff Medwin
Follow Ups:
Hi Jeff,
My goal is neither of your suggestions, but rather to have a little fun by doing a little tube rolling in my Fi 300B monos.
I tried the RCA 5R4GY (brown base) with a nice result, but have never tried the 274B, so I thought that might be fun to try, but was trying to narrow down the choice a bit.
Kind regards,
Jeff
The problem with a 5R4 is it is a high drop, high Z rectifier, suitable more for a preamp than a DHT amp's demands. But, the 5R4 sounds nice, because it is a directly heated rectifier.
Of course, lower Z 5U4's and 5V3s, are also directly heated rectifiers, and out-perform dynamically the 5R4 easily. Paralleling two is cool to listen to !
In addition to a fancy-schmancy 274B (I don't like any of the WE tubes generally) listen to a single 5V3 or a 5V3A in your amp, the A needing only 3 A. of filament current, the earlier 5V3 needing 3.7 to maybe 4 A. of current, and its FUN to behold and hear.
Jeff Medwin
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