Read and understand
the codes . . . |
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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. |
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Example: I66 Δ0K4
I6 = ECC83
I66 = ECC83 of construction #6
Δ = Made in Heerlen/Holland
0K4 = Made 197 0 in
November K
4th week |
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type | type | batch/construction
factory
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| month | week |
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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. |
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The most important
factories/plants for Philips audio tubes: |
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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 |
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The type codes for the
most common audio tubes |
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Type |
Code |
Comment |
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Type |
Code |
Comment |
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Type |
Code |
Comment |
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EC92 |
VH |
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E80CC |
VB or Wk |
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EL81 |
MD or S0 |
PL81 = SX |
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ECC81 |
VF TK YK |
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ECC808 |
C6 |
6EU7 = AF |
EL84 |
rX or kM |
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ECC801S |
ACZ |
E181CC = IW |
ECF80 |
39 |
PCF80 = r7 |
E84L |
Xr |
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E81CC |
Df or VG |
label: 6201 |
ECF82 |
4X |
PCF82 = G1 |
EL86 |
MI or 2f |
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ECC82 |
Gf |
E82CC = mX |
ECL82 |
fK or 0G |
PCL82 = 7E |
EL95 |
SI |
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ECC82 |
K6 |
E182CC = ID |
ECL86 |
WS |
PCL86 = W1 |
EL500/4 |
AE / X+ |
PL500/4=JD/t2 |
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ECC83 |
I6 |
later, short plate |
EF42 |
MA |
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EL503 |
tB |
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ECC83 |
mC |
early, long plate |
EF86 |
8Y |
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ELL80 |
C4 |
no ECLL code! |
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E83CC |
Hf or f9 |
E283CC = m5 |
EL34 |
SY or KE |
metal base |
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ECC88 |
GA orCm |
PCC88 = DJ |
EL34 |
xf |
later tubes |
EZ80 |
kB or kC |
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E88CC |
7L |
E88C = A3 Ck |
EL36 |
DI |
PL36 = 43 |
EZ81 |
8t |
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E188CC |
VR |
E288CC = C5 |
EL42 |
M6 |
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GZ34 |
tV or mN |
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