NOS 5AR4 -Rare- SONOTONE By MULLARD - Double Getter

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ALL TUBES GUARANTEED! Tested on a freshly calibrated Hickok 6000 (recapped, vac's checked and fine adjusted, cleaned rebuilt and calibrated deoxited pots, known value tube compared)- lines are reset/zeroed before each and every section test regardless of number of sections per tube - NOS 5AR4 GZ34 SONOTONE labeled BY MULLARD! ABSOLUTELY PERFECT ! same as my other 5AR4 auction but different distributor and date codeTONS OF PICS!BY MULLARD FOR SONOTONE (see notes) All the Mullard tell tale signs:code: f32 B2I3 - Mid - 1960's-Mullard center pin hole - 4-notch plates - Double Halo Getter- Six holes in each plate all shown in picture detailsMade In Blackburn, Great Britain(box also says made in England)Picture of Double Halo Getters may look like a UFO antimatter reactor in pictures because I held a flash light behind it to get light in under the bright flashing! :)Box is great. The following values were tested on section1/section2 for each tube ( Gm minimum 4800 / Gm new/like new average 7500 ): Tube 1: NOTE: There is NO Gm data for average new on the Hickok 600/6000/6000a testers. see roll chart data picture All I can say is that the GOOD / BAD test throws the needle FAR into the good range. NOTE: THIS IS NOT A PERCENTAGE TEST ON THIS TESTER!!! Tests VERY well on EVERY test I have available.See test result picture for standard red/green test. NOS usually hits between the first and second major ticks {around 2000-2500 depending on tube} on the red/green scale.Long life test tests extremely well. Normally this test passes for an excellent tube with long life expectancy if it doesn't move more than a few ticks down from the 2000 mark... this tube actually gos UP one! I don't know though if that has something to do with this type of tube (my other similar tubes usually do also). This is an excellent tube in excellent shape. It's probably new or equivalent condition to new.Some info from the interwebs w sources about "Mullards made for" identifications:"Brent Jesse or Brendan at Tube World would only sell a 'true' Mullard or Amperex (Philips production) 5AR4. This is for anyone buying from E-bay or perhaps a tube seller who doesn't care as much as these guys." "I have 2 Amperex branded Bugle Boy 5AR4's. One is an Amperex with a L code (Philips production in Holland) the other is a Mullard with a B code (Mullard Blackburn production).Here is an example of a pair of 'Amperex' branded Mullard 5AR4's:Look at the etching on the second line. It begins with a 'B' (not an E as the seller stated) for Blackburn, UK Mullard production. These are indeed very nice Mullards, but not Amperex. They are also marked 'Made in Gt. Britain' and they were." /index.php?topic=56330.40 "This is the third version with Double O-Getter . Better than single O-Getter version. They maybe marked as Mullard, Philips, Amperex, Telefunken, Siemens, IEC, RCA, GE... but all of them made in Blackburn of G.Britain by Mullard (late 1960s). " source: /index.php?page=product&do=browse&catid=108 "5AR4/GZ34 Mullard made, 4-notch plates in short bottle, hole in centering pinMade by Mullard in Great Britain and labelled Amperex, IEC Mullard, Hammond, H-P, Scott, RCA, Telefunken, Sylvania, or GE, Dynaco. 4-notch serrated plate edges. Blackburn, UK ("B") factory 1960s date codes. The sound is close to the steelbase and fat base types, you get the real UK made Mullard,..." source: /audtube.htm WHAT YOU SEE IS WHAT YOU GET!!! Pictures are of ACTUAL valves sold! Test numbers written on boxes. Tubes are individually and thoroughly tested and PASS each of the following tests : GOOD/ ??? /REPLACE TEST (only tubes far into the GOOD range are further tested) Gas presence (no gassy tubes, also I do not bake tubes) Gm in micromhos (proper values listed) Filament continuity (no internal shorts) Lifesp... read more

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