MATCHED PAIR of early 1950's closely, matched early production RCA 5U4G, ST bottle type, full wave rectifier tubes. Drop-in compatible replacement for Western Electric 274B or Altec type 1276 rectifier, for your cinema amps.
Exhibit B, shows actual tube under test, dynamic emissions at full load for easy reference. Both (2) tubes / read STRONG 125% .
They test (and sound) strong, quiet and were current matched (balanced) on a 2nd lab tester at full plate ratings.
In original RCA boxes where they've been stored carefully for years. Very old tubes, pretty low hours , they have lots of life left -- from early HiFi estate. Just throughly checked using multiple testers and played with music. Working well; quiet and matched, detailed and sounding great! Guaranteed no problems. The most throughly tested, closest pair of these you'll will see anywhere! Very hard to find They will sell quickly.
By the late 1940's just after World War II, RCA moved to the more rugged and robust, retaining the large shouldered "ST" bottle, replaced the hanging spring, to a suspended band filament and moved to a top side D getter. These tubes, in many applications sound better than the more common 5u4G-B types. They provide smoother midrange, and more detail, with less "fuzziness". If you are currently using modern production rectifiers, and have a space for a Western Electric 274B or 5u4GB (check your current requirements) / or any 5u4G ... then give these a try -- you'll love them! These tubes are considered premium, for rectifier placement.
Dealers everywhere can no longer find these early RCA's, as they haven't been made for nearly 65 years. And for guitar amps -- these are some of the very best tubes you can use ... and this PAIR; have plates that are incrediblely close, and strong, and READING AS NOS at the full operating volts eP -- .. they are also all very close dates of production (see exhibit C&D for dates -- all early 1950s), and at the start of the 45mm ribbed plate (just post smooth) design ... amongst the later incarnation of the 1940s 5u4 redesign, and arguably one of the most perfected versions of this venerable rectifier. This design begain in the late 1940s and stretched until 1950s decade. (see exhibit B,C,D).
Cosmetics are very beautiful .... flashing is very shinny & thick on top, idicative of their NOS statud and they ACED a a test at lower filament volts, thus confirming a long life ahead. These really present beatifully and have SILVER RCA letters in on black bakelite bases.. Strong , NOS, no gas or shorts. They were carefully checked and played with music -- for full details please read the reports in exhibit B,C,D below, for date codes and test results.
With closely matched plates & dates, and nice boxes -- you just don't see'em like this very often. Study the included tube test results in photos and you'll see just how nicely fussed over, clean and well tested these originals are!
If you're currently a user of modern tubes then these will make a world of difference in your sound — a real upgrade and a treat for your ears -- clean, clear and more overall detail you can really hear.
Buy Now to avoid a bidder’s war.
Check my 100% feedback (check over what buyers have to say ... they love these vintage US tubes and I get allot of repeat customers ) ...always fast shipping, and always safe double box packing !!
100% happiness assured on all tubes and old audio items. Guaranteed NO DOA.
