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Philips Audio Tubes

(Valvo Amperex Mullard)

Logos and Labels

Characteristics

Understand Codes

Common Labels
Label Colors

ECC81

ECC82
ECC83
E88CC

EF86

EL34

EL84

EZ80/81

GZ34

Other Tubes


Read and understand the codes . . .

           
 

  The codes are written in two lines on standard tubes and in two rows on special tubes (as E88CC) on the glass close to the base.

             
 

Example: I66 Δ0K4
   I6 = ECC83
   I66 = ECC83 of construction #6
   Δ = Made in Heerlen/Holland
   0K4 = Made 197 0 in

            November K

            4th week

       
 

type | type | batch/construction

 factory | year | month | week

         
                       

  The batch or construction digit indicates different construction designs (see ECC83 with short plates as good example).

  Tubes before 1960 have a second line with only 3 digits. Their production month can only be derived from a special table.

                       
  The most important factories/plants for Philips audio tubes:
                       
         

Δ    Heerlen, Holland

D    Hamburg, West Germany

B    Blackburn, England (GB)

L    Brussels, Belgium

1 2 3 6 9 Eindhoven, Holland

   Munich, Germany Siemens & Halske

X Y Sittard, Holland

                       
  The type codes for the most common audio tubes        
 
  Type Code Comment

Type Code Comment

Type Code Comment
  EC92 VH   E80CC VB or Wk   EL81 MD or S0 PL81 = SX
  ECC81 VF TK YK   ECC808 C6 6EU7 = AF EL84 rX or kM  
  ECC801S ACZ E181CC = IW ECF80 39 PCF80 = r7 E84L Xr  
  E81CC Df or VG label: 6201 ECF82 4X PCF82 = G1 EL86 MI or 2f  
  ECC82 Gf E82CC = mX ECL82 fK or 0G PCL82 = 7E EL95 SI  
  ECC82 K6 E182CC = ID ECL86 WS PCL86 = W1 EL500/4 AE / X+ PL500/4=JD/t2
  ECC83 I6 later, short plate EF42 MA   EL503 tB  
  ECC83 mC early, long plate EF86 8Y   ELL80 C4 no ECLL code!
  E83CC Hf or f9 E283CC = m5 EL34 SY or KE metal base      
  ECC88 GA orCm PCC88 = DJ EL34 xf later tubes EZ80 kB or kC  
  E88CC 7L E88C = A3 Ck EL36 DI PL36 = 43 EZ81 8t  
  E188CC VR E288CC = C5 EL42 M6   GZ34 tV or mN  
 

 

 

 

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