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  3. 134612-9818

Modwright PS 9.0 and 9.9 Power Supply Rectifiier Tubes

After extensive listening to more than a dozen different rectifiers, I concluded that my Phillips 5R4GYS, 1949 RCA 5U4G, and 60's Mullard GZ32 5V4 were superior in the PS 9.0 and 9.9 to any 5AR4/GZ34 I have tried including NOS Mullards and the Phillips metal base 5AR4. The RCA 5U4G and Mullard 5V4 are pretty close in sound quality, and both are more articulate and natural sounding than the Phillips 5R4GYS. I also picked up an NOS 1944 Tung Sol 5U4G (not the 5U4GB) which by a small margin (lower noise floor) was the best rectifier tube I had heard in the Modwright PS 9.0 and 9.9 until the new Sophia Electric blue 274B arrived in today's mail. This special 274B is designed to be a direct replacement for the 5U4G (and substitutes). I started listening to it in the PS 9.0 and right out of the box it produced the most natural piano tone I have ever gotten from my system. With about 30 hours on it I am comfortable in saying that it is the best sounding rectifier that I have ever heard in the PS 9.0 and 9.9.

Jeff Day has reviewed this tube for Positive Feedback and on his "Jeff's Place" blog for anyone who is interested.
128x128cellcbern

Showing 2 responses by ptrck887

ptrck887
80 posts
 
Thanks cellcbern....just saw this thread.  I've been using the GEC U52 in my PS 9.9 with the best results of all the above mentioned rectifiers....coincidentally this evening I just ordered the Shophia Aqua 274B.  Looking forward to getting it Saturday....so much for my plans on running in the WE 422A.  I'll post my results next week.
Thanks
ptrck887
80 posts
 
Hello all,
I have had the opportunity to put just over 100 hours on the new Sophia Aqua 274A and tonight spent several hours listening to a variety of my reference cuts....the 274A is a very nice tube...huge 3D soundstage, great separation and layering.  I would call it on the warm side of neutral and perhaps just a tad rolled off in the HF....not necessarily a bad thing.  A very "tubey" presentation.  I liked it alot, but after many trials back and forth, it simply can't match the detail and refinement of the GEC U52.  It's simply more tonally accurate, more focused.  The vocals are unbelievably realistic.  I've run most of the highly regarded rectifiers thru my PS9.9, including the Western Electric 422A, Mullard Metal base GZ34, Mullard GZ-32 & 37 , Might 596, early TungSol and RCA 5U4G, Phillips 5R4GY & RCA 5R4GY.  The U52 bests them all at least in my rig to my ears.  Just a great blend of detail, accuracy and warmth...YMMV, but if you ever get the chance to snag a GEC U52 at a decent price you might want to give it a try...
Happy listening!
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