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Posted: Mon Apr 07, 2008 9:48 am
by pckpat
philips heerlen(aka amperex bb's)will have a delta symbol(factory code) near the base.above this they will say I6*(*number is revision code)I6 = 12ax7/ecc83.philips- made preamp tubes(incl.mullards,canadian rogers,incl. many others will flash upon startup)
Posted: Mon Apr 07, 2008 10:07 am
by rgalpin
good info - i'll have to check for these markings. thanks!
Re: Tried an NOS Amperex 12AX7 in V1
Posted: Mon Jan 27, 2020 1:48 pm
by mojovaughan
Tell me,
How was the Amperex in v1? Was it Brighter, thinner, or what? What was in the v2& v3? I noticed allota guys installed the 5751 in v2 and Tungsol v3...