2. misc-audio
  3. 157071-3347

Mitchum or Blackburn for the Mullard 6922?

Do Mitchum production and Blackburn production sound different in the Mullard 6922? I believe I once read somewhere that Mitchum made tubes for the military, whereas Blackbutn did not, so, presumably, with better materials and/or tighter tolerances or testing. 
pmboyd
pmboyd OP
391 posts
 
Codes when I have it in hand.
pmboyd OP
391 posts
 
petg60... Mullard e88cc code is B5H3.
Post removed 
petg60
1,486 posts
 
HI,
Thanks,
Branded IEC Mullard?
B5H3 is only the manufacturing date and plant, should have more digits for type of tube before those.
Are these numbers etched or same lettering as Mullard?
I have seen such tubes on eBay and they are Mullard made ones but not sure if rebranded or not.


pmboyd OP
391 posts
 
Tube code is etched on the bottom side. 
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