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In Reply to: RE: 12AT7/ECC81 - Amperex or Mullard? posted by rosendds@frontiernet.net on October 10, 2015 at 14:54:29
Yes, they are ok but not great. Amperex Bugle Boy are tubes produced in the Heerlen factory in the late 50's and 60's. There is nothing special about the Bugle Boy brand in itself, apart form the vintage. Remember with Philips factories vintage matters so even with Bugle Boys, look for the earlier vintage. The best tubes from Philips factories come from the early 50's prior to bugle boy labelling. These tubes use the old Philips codes printed on the base of the tube between the pins. The best Heerlen 12at7 (ecc81) are pre 1955 old code with welded plates. However, in the hierarchy of Philips factories Heerlen is middle of the road in overall performance. The best Philips factories not specific to any tube type are:
1. MBLE (Brussels)
2. Eindhoven
2. Copenhagen
4. Hamburg (Valvo)
5. Siemens
There are other variables that determine tube type performance, but in general the above list is a good guide.
Follow Ups:
Thanks for that information on the factories.The Bugle Boy 12AT7's that I just bought on The Bay are labeled Great Britain.I should have them next week.
Its possible these tubes are from the Blackburn factory. If the factory code is "B" than its Blackburn. The Bugle Boy label can be misleading since it was used by other Philips factories (as well as Amperex). Factory codes are more reliable indicator of origin and vintage.
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