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List of errors in Electronic Tube Handbook Muiderkring

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11.Sep.20 15:21

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From a guest, Robert Gribnau in the Netherlands, we received a list of errors which he found in the Electronic Tube Handbook Muiderkring, 17th edition from 1976. Thank you very much in the name of all collectors and users of our tube pages. Only by working together, we can provide solid information.

We have to accept that we all are not foolproof. Especially such a general work will contain errors. We can not change a book. But we can publish specific errors to the specific tube pages. This is my attempt, but I have to find members who do the job.

The list here is merely to explain who was the helper and also is good to check which tubes have to be met for changes or information. We will try to bring in the information in English when writing to the tubes.

Mistakes in the Electronic Tube Handbook (Muiderkring, 17th revised edition, 1976)

Author: Robert Gribnau (The Netherlands) Version: 11 September 2020

Only when I use “***WRONG!”, I count the diagram as mistaken.  The rest of the remarks are mostly about inconsistencies.

I Thyratrons (checked till 627)

II Diodes (Checked till 6W5)

1R4:       Pin 2 ***WRONG! (Pin 2 = internal shield)

1V2:       Pin 1 ***WRONG! (anode = 1 & 9)

               Imax ***WRONG! (Imax = 0,6 mA)

1X2A:    Imax ***WRONG! (Imax = 1,1 mA)

Va inv.p = 20 kV including DC component

3A2:       Va inv.p = 20 kV including DC component

3A3:       Iap max ***WRONG! (Iap max = 88 mA)

               Imax ***WRONG! (Imax = 1,7 mA)

3AL5:     Vd max ***WRONG! (Vd max = 117 V)

3DG4:    I max ***WRONG! (I max = 350 mA)

5AS4:     Rt min ***WRONG! (Rt = min 2 x 67 Ohm)

5AU4:    If ***WRONG! (If = 3,75 A)

5AW4:   If ***WRONG! (If = 3,7 A)

5AX4:    Cmax = 10 uF doesn’t follow from datasheets

               Rt min = 50 Ohm doesn’t follow from datasheets

5DJ4:     Imax ***WRONG! (Imax = 275 mA)

5U4:      Rt min ***WRONG! (Rt min = 2 x 75 Ohm)

               Most datasheets: Cmax = 40 uF

5V3:       Rt min ***WRONG! (Rt min = 2 x 56 Ohm)

5V4:       Rt min ***WRONG! (Rt min = 2 x 100 Ohm)

5W4:     Rt min ***WRONG! (Rt min = 2 x 50 Ohm)

               Doubts over Imax (most datasheets: Imax = 100 mA)

               Doubts over Cmax (most datasheets: Cmax = 40 uF)

5X4:       Rt min ***WRONG! (Rt min = 2 x 75 Ohm)

5Y3:       Rt min ***WRONG! (Rt min = 2 x 30 Ohm)

5Z3:       Cmax ***WRONG! (Cmax = 40 uF)

              Rt min ***WRONG! (Rt min = 2 x 75 Ohm)

5Z4:       Rt min ***WRONG! (Rt min = 2 x 30 Ohm)

6AX5:    Rt min ***WRONG! (Rt min = 2 x 50 Ohm)

6BJ7:     Id max ***WRONG! (Id max = 10 mA)

6BY5:    Cmax = 8 uF doesn’t follow from datasheets

6DQ4:   Vpri max ***WRONG!? (Vpri max = 700 V doesn’t follow from datasheets. Va invp max = 5,5 kV) 

6U4:      Imax ***WRONG! (Imax = 138 mA)

               Vpri max ***WRONG!? (Vpri max = 350 V doesn’t follow from datasheets. Va invp max = 3,85 kV)

Cmax = 20 uF doesn’t follow from datasheets

6V3A:    Iap max ***WRONG! (Iap max. = 600 mA)

6W4:     Vpri max ***WRONG!? (Vpri max = 350 V doesn’t follow from datasheets. Va invp max = 3,95 kV)

               Rt min = 145 Ohm doesn’t follow from datasheets

               Cmax = 20 uF doesn’t follow from datasheets

(Problem: How to deal with Vpri max ?)

AZ32:     If ***WRONG! (2 A instead of 2,3 A)

III Triodes

2BN4:    Vg ***WRONG! (- 6 V gives Ia =  100 uA, so not 9 mA)

2T4:       Vg ***WRONG! (- 15 V gives Ia = 50 uA so not 18 mA)

3BN4:    Vg ***WRONG! (- 6 V gives Ia = 100 uA so not 9 mA)

3ER5:    Pin cathode and pin screen ***WRONG! (cathode = 1 & 7 / screen = 6)

4BC8:    Vg ***WRONG! (- 13 V gives S = 0,05 mA/V so not S = 6,2 mA/V)

4BQ7A: Vg ***WRONG! (-10 V gives Ia = 10 uA so not 9 mA)

4BS8:     Vg ***WRONG! (- 7 V gives Ia = 10 uA so not 10 mA)

4BZ7:     Vg ***WRONG! (- 11 V gives S = 0,05 mA/V so not S = 6,8 mA/V)

5BK7A:  Vg ***WRONG! (-11 V gives Ia = 10 uA so not 18 mA)

5BQ7A: Vg ***WRONG! (-10 V gives Ia = 10 uA so not 9 mA)

6AM4:   Vg ***WRONG! (-6,5 V gives Ia = 10 uA so not 10 mA)

6AN4:    Vg ***WRONG! (- 7 V gives Ia = 20 uA so not 13 mA)

6BC4:    Vg ***WRONG! (- 10 V gives Ia = 10 uA so not 14,5 mA)

6BC8:    Vg ***WRONG! (- 13 V gives S = 0,05 mA/V so not S = 6,2 mA/V)

6BK7A:  Vg ***WRONG! (- 11 V gives Ia = 10 uA so not 18 mA)

6BN4:    Vg ***WRONG! (- 6 V gives Ia = 100 uA so not 9 mA)

6BQ7A: Vg ***WRONG! (-10 V gives Ia = 10 uA so not 9 mA)

6BS8:     Vg ***WRONG! (- 7 V gives Ia = 10 uA so not 10 mA)

6BX7:    Vg ***WRONG! (- 40 V gives Ia = 50 uA so not 42 mA)

6BZ7:     Vg ***WRONG! (- 11 V gives S = 0,05 mA/V so not S = 6,8 mA/V)

6CC41:  Vg ***WRONG! (correct is - 1,5 V)

6ER5:    Pin cathode ***WRONG! (cathode = 1 & 7)

6N7:      Ia ***WRONG! (Ia = 6 mA is valid for both triode sections paralleled)

6T4:       Vg ***WRONG! (-15 V gives 50 uA so not 18 mA)

12AZ7:  Vg1 ***WRONG! (- 12 V gives 10 uA so not 10 mA)

EC81:    Pa max ***WRONG! (Pa max valid for stabilized Vf and Va = 5 W so not 3,5 W; Indicated Va and Ia are valid for stabilized Vf and Va; Va x Ia = 4,5 W)

EC84:    mu ***WRONG! (mu = 42 so not 110)

ECC87:  mu ***WRONG! (2,8 ma/V x 11,5K = 32 so not 45)

ECC189: mu ***WRONG! (12,5 ma/V x 2,5K = 32 so not 65)

PC96:    mu ***WRONG! (u = 67 so not 200)

PCC189: mu ***WRONG! (12,5 ma/V x 2,5K = 32 so not 65)

Out of the 230 diagrams 31 contain one or more mistakes (= 13,5 %)

IV Tetrodes en Penthodes (I have to check this section again/better)

4DE6:    Internal connection between cathode and supressor grid is ***WRONG!.

12CN5: Cathode is not indicated so ***WRONG! (should be "1")

Screen ***WRONG! (12CN5 has no screen).

E90F:     Vg1 ***WRONG! (-7,7 V gives 10 uA so not 10 mA).

V Power Tubes

1S4:       Po = 0,27 W valid at Dtot = 12 %

1T5:       Ig2 valid at Vi max (At Vi = 0: Ig2 = 0,8 mA)

2A5:       S ***WRONG! (S = 2,5 mA/V so not 2,2 mA/V)

3S4:       Po = 0,27 W valid at Dtot = 12 %

3V4:       Ia and Ig2 ***WRONG! (Ia = 9,5 mA and Ig2 = 2,1 mA so not Ia = 8 mA and Ig2 = 1,8 mA)

5CZ5:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 4,6 mA)

5V6:       Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 45 mA and Ig2 = 4,5 mA)

6AM5:   Vi ***WRONG! (Vi = 5,3 V in most datasheets, so not 9,4 V)

6AN5:    Ri ***WRONG! (Ri = 12,5 K so not 130K)

6AU5:    Ig2 ***WRONG! (Ig2 = 6,8 mA so not 6 mA)

6BF5:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 36 mA and Ig2 = 4 mA)

6BK5:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 35 mA and Ig2 = 3,5 mA)

6BQ5:    Po = 4,7 W valid at Dtot higher than 10 %

6CA5:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 37 mA and Ig2 = 4 mA)

6CL6:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 30 mA and Ig2 = 7 mA)

6CM6:   Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 45 mA and Ig2 = 4,5 mA)

6CZ5:     Ia and Ig2 valid for or Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 4,6 mA)

6DB5:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 2,2 mA)

6DG6:    Vba and Vbg2 ***WRONG! (the indicated voltages are interchanged)

Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 2,2 mA)

6EH5:    Ig2 valid for Vi max (At Vi = 0: Ig2 = 11,5 mA )

6GB5 or EL/PL500 ***WRONG!:

Values for Ig2 differ (37 mA versus 30 mA) while they are identical, except for filament requirements.

6GC5:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 2,2 mA)

6GK6:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 48 mA and Ig2 = 5,5 mA)

6HB6:    Vg1 ***WRONG! (Vg1 = - 4,6 V so not - 4,8 V)

6V6:       Ia and Ig2 are valid for Vi max (At Vi = 0: Ia = 45 mA and Ig2 = 4,5 mA)

6W6:     Ia and Ig2 are valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 2,2 mA)

6Y6:       Ia or Ig2 ***WRONG!

(At Vi = 0 geldt: Ia = 61 mA en Ig2 = 2,2 mA ; At Vi max: Ia = 66 mA and Ig2 = 9 mA)

7D9:      Ia ***WRONG! (Ia = 16 mA so not 6 mA)

               Vi ***WRONG! (Vi = 5,3 V in most datasheets so not 9,4 V)

8BQ5:    Po = 4,7 W valid for Dtot higher than 10 %

12AB5:  Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 45 mA and Ig2 = 4,5 mA)

12BK5:  Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 35 mA and Ig2 = 3,5 mA)

12CA5:  Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 37 mA and Ig2 = 4 mA)

12CU5: Vg2 ***WRONG! (Vg2 = 110 V so not 120 V)

               Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 49 mA and Ig2 = 4 mA)

12FX5:   Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 36 mA and Ig2 = 10 mA)

12GC6:  Pin 4 ***WRONG! (pin 4 & pin 8 = screengrid so not only pin 8)

12L6:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 2,2 mA)

12L8:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 13 mA and Ig2 = 2,8 mA)

12V6:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 45 mA and Ig2 = 4,5 mA)

12W6:   Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 2,2 mA)

17CU5: Vg2 ***WRONG! (Vg2 = 110 V so not 120 V)

               Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 49 mA and Ig2 = 4 mA)

25C5:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 49 mA and Ig2 = 4 mA)

25CA5:  Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 37 mA and Ig2 = 4 mA)

25EH5:  Ig2 valid for Vi max (At Vi = 0: Ig2 = 11,5 mA)

25L6:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 46 mA and Ig2 = 2,2 mA)

26A7:    Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 20 mA and Ig2 = 1,9 mA)

35EH5:  Ig2 valid for Vi max (At Vi = 0: Ig2 = 7,2 mA)

35GL6:  Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 45 mA and Ig2 = 3 mA)

50EH5:  Ig2 valid for Vi max (At Vi = 0: Ig2 = 11,5 mA)

50FK5:   Ig2 valid for Vi max (At Vi = 0: Ig2 = 8,5 mA)

60FX5:   Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 36 mA and Ig2 = 10 mA)

4654:     Po = 9,2 W valid for Dtot = 11,4 %

5881:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 75 mA and Ig2 = 4,3 mA)

7591:     Ia and Ig2 valid for Vi max (At Vi = 0: Ia = 60 mA and Ig2 = 8 mA)

7695:     Ig2 valid for Vi max (At Vi = 0: Ig2 = 5 mA)

DL91:    Po = 0,27 W valid for Dtot = 12 %

DL92:    Po = 0,27 W valid for Dtot = 12 %

DL94:    Po = 0,34 W valid for Dtot = 12 %

DL95:    Po = 0,34 valid for Dtot = 12 %

EL12:     Ra = 3K5 according to several sources.

EL34:     S ***WRONG! (S = 12,5 mA/V so not 11 mA/V)

              Vg1 ***WRONG! (Vg1 = - 13,8 V so not - 13,5 V)

EL37:     Po = 11,5 W valid for Dtot = 13,5 %

EL42:     Po = 2,8 W valid for Dtot = 12 %

EL60:     S ***WRONG! (S = 12,5 mA/V so not 11 mA/V)

               Vg1 ***WRONG! (Vg1 = - 13,8 V so not - 13,5 V)

EL84:     First diagram: Po = 6 W valid for Dtot = 11 %

EL84:     Second diagram: Po = 4,7 W valid for Dtot higher than 10 %

EL91:     Vi ***WRONG! (Vi = 5,3 V in most datasheets so not 9,4 V)

EL183:   Ia ***WRONG! (Ia = ca. 12 mA so not 20 mA)

EL508 or PL508 ***WRONG!:

Values for Ig2 differ (37 mA versus 30 mA) while they are identical, except for filament requirements.                                                     

HL94:    Ig2 valid for Vi max (At Vi = 0: Ig2 = 3 mA)

PL84:     Ig2 valid for Vi max (At Vi = 0: Ig2 = 5 mA)

UBL1:    Pa ***WRONG! (Pa = max. 11 W so not max. 1 W)

UL2:      Second diagram: Ra ***WRONG! (Ra = 10 K so not 12 K)

UL41:    First diagram: Po = 4,25 W valid for Dtot higher than 10 %

UL41:    Second diagram: Po = 1,35 W valid for Dtot higher than 10 %

Of the 240 diagrams 20 contain one or more mistakes (= 8,3 %)

Of the 163 diagrams with an OPT/LSP:

107 diagrams indicate Ia and/or Ig2 at Vi = 0 or at Vi = unknown (65,6 %)

41 diagrams indicate Ia and/or Ig2 at Vi max (= 25,2 %)

15 diagrams indicate Po at Dtot higher than 10 % (= 9,2 %)

The 6BM8 doesn’t belong in this chapter.

VI Frequency Changers (I didn’t check this chapter yet)

VII Combination Tubes

BN7:    Pa section A ***WRONG! (Pa = max 7,5 W so not 6 W)

               Pa section B ***WRONG! (Pa = max 1,5 W so not 1 W)

6DE7:    Pa section A ***WRONG! (Pa = max 1,5 W so not 7 W)

8CM7:   Vg section A ***WRONG! (Vg = - 18 V so not - 8 V)

10DE7:  Pa section A ***WRONG! (Pa = max 7 W so not 5,5 W)

               Pa section B ***WRONG! (Pa = max 1,5 W so not 1,2 W)

               Vf ***WRONG! (Vf = 9,7 V)

13DE7:  Pa section A ***WRONG! (Pa = max 1,5 W so not 7 W)

7247:     Vg section A ***WRONG! (Vg = - 8,5 V so not - 0,5 V)

EFM1:   Pin 1 ***WRONG! (Pin 1 = metallic shield)

EH90:    Sg3-a ***WRONG! (Sgr-a = 1,25 mA/V so not 1,55 mA/V)

EQ40:    Ig5 ***WRONG! (Ig5 = 0,03 mA so not 0,05 mA)

EQ80:    Ig5 ***WRONG! (Ig5 = 0,03 mA so not 0,05 mA)

UQ80:   Ig5 ***WRONG! (Ig5 = 0,03 mA so not 0,05 mA)

               Ra ***WRONG! (Ra = 330 K bij Vb = 170 V so not 470 K)

               Rg3+5+7 ***WRONG! (Rg3+5+7 = 21 K so not 34 K)

5AM8:   Pa ***WRONG! (Pa = max 3,2 W so not 2,8 W)

5AN8:    Pa pentode ***WRONG! (Pa = max 2,3 W so not 2 W)

               Pa triode ***WRONG! (Pa = max 2,8 W so not 2,5 W)

5CM8:   Va pentode ***WRONG! (Va = 200 V so not 250 V; at 250 V Pa max would be violated)

               Vg1 pentode ***WRONG! (Vg1 = - 2,2 V so not 0 V)

5CQ8:    Pa tetrode ***WRONG! (Pa = max 3,2 W so not 2,8 W)

               Pa triode ***WRONG! (Pa = max 3,1 W so not 2,7 W)

5EA8:    Ri pentode ***WRONG! (Ri = 200 K so not 80 K)

6AM8:   Pa ***WRONG! (Pa = max 3,2 W so not 2,8 W)

6AN8:    Pa pentode ***WRONG! (Pa = max 2,3 W so not 2 W)

               Pa triode ***WRONG! (Pa = max 2,8 W so not 2,5 W)

6CM8:   Va pentode ***WRONG! (Va = 200 V so not 250 V; ; at 250 V Pa max would be violated)

               Vg1 pentode ***WRONG! (Vg1 = - 2,2 V so not 0 V)

6CQ8:    Pa tetrode ***WRONG! (Pa = max 3,2 W so not 2,8 W)

               Pa triode ***WRONG! (Pa = max 3,1 W so not 2,7 W)

6CU8:    Vg1 pentode ***WRONG! (Vg1 pentode = - 0,9 V)

6EA8:    Ri pentode ***WRONG! (Ri = 200 K so not 80 K)

6GN8:   If ***WRONG! (If = 0,75 A so not 0,7 A)

6KA8:    Vg1 pentode ***WRONG! (Vg1 pentode = - 1,2 V so not - 1,8 V)

6LC8:     Pa triode ***WRONG! (Pa = max 1,1 W so not 1 W)

6X8:       Pa triode ***WRONG! (Pa = max 1,5 W so not 1 W)

8KA8:    Vg1 pentode ***WRONG! (Vg1 pentode = - 1,2 V so not - 1,8 V)

8LC8:     Pa triode ***WRONG! (Pa = max 1,1 W so not 1 W)

9CL8:     Vg triode ***WRONG! (Vg triode = - 0,84 V so not 0 V)

12DY8:  If ***WRONG! (If = 0,35 A so not 0,55 A)

19EA8:  Ri pentode ***WRONG! (Ri = 200 K so not 80 K)

19X8:     Pa triode ***WRONG! (Pa = max 1,5 W so not 1 W)

ECF82:  Vg1 pentode ***WRONG! (Vg1 pentode = 0,92 V so not - 0,68 V)

               Vg1 triode ***WRONG! (Vg triode = 1 V so not 1,08 V)

ECF86:  mug1g2 ***WRONG! (mug1g2 = 70 so not 60)

ECF200: If ***WRONG! (If = 0,41 A so not 0,4 A)

                mug1g2 ***WRONG! (mug1g2 = 53 so not 55)

               mu ***WRONG! (mu = 57 so not 55)

ECF201: If ***WRONG! (If = 0,41 A so not 0,4 A)

                Vg1 pentode ***WRONG! (Vg1 pentode = - 1,4 V so not - 1,7 V)

                Vg triode ***WRONG! (Vg triode = - 2 V so not - 3 V)

ECF801: Vg1 pentode ***WRONG! (Vg1 pentode = - 1,4 V so not - 1,2 V)

ECH200: Pa pentode ***WRONG! (Pa = max 0,5 W so not 1 W)

ECL85: Pa inconsistent (Pa max 9 W is absolute maximum; In the diagram for the equivalent 6GV8: Pa = max 7 W)

ECL86:  If ***WRONG! (If = 0,66 of 0,7 A so not 0,55 A)

               Ri pentode ***WRONG! (Ri = 45 K so not 48 K)

ECLL800: The indicated values for Ia and Ig2 are valid for Po max

ECL113: Va triode ***WRONG! (Va = 130 V so not 250 V)

EFL200: Pa F section ***WRONG! (Pa = max 1,5 W so not 2,5 W)

               If ***WRONG! (If = 0,81 of 0,85 A so not 0,95 A)

PCF86:  mug1g2 ***WRONG! (mug1g2 = 70 so not 60)

PCF200: mug1g2 ***WRONG! (mug1g2 = 53 so not 55)

               mu ***WRONG! (mu = 57 so not 55)

PCF201: Vg1 pentode ***WRONG! (Vg1 pentode = - 1,4 V so not - 1,7 V)

 Vg triode ***WRONG! (Vg triode = - 2 V so not - 3 V)

PCF801: Vg1 pentode ***WRONG! (Vg1 pentode = - 1,4 V so not - 1,2 V)

                 Vf ***WRONG! (Vf = 8,5 V so not 8 V)

PCH200: Pa pentode ***WRONG! (Pa = max 0,5 W so not 1 W)

PCL85: Pa inconsistent (Pa max 9 W is absolute maximum; In the diagram for the equivalent 6GV8: Pa = max 7 W)

PFL200: Pa max F section ***WRONG! (Pa max = 1,5 W so not 2,5 W)

               Vf ***WRONG! (Vf = 17 V so not 19 V)

PCL86:  Vf ***WRONG! (Vf = 13,3 V so not 14,5 V)

               Ri pentode ***WRONG! (Ri = 45 K so not 48 K)

6R8:       S ***WRONG! (S = 1,9 mA/V so not 2 mA/V)

6V8:       Pa ***WRONG! (Pa = max 1 W so not 0,5 W)

9BR7:    S ***WRONG! (S = 5,5 mA/V so not 4 mA/V)

19C8:    Pa ***WRONG! (Pa = max 1 W so not 0,5 W)

Of the 215 diagrams 52 contain one or more mistakes (= 24,2 %)

VIII Cathode-Ray Tubes (I didn’t check the picture tubes yet)

6E5:       Is = 4 mA valid for Vg = 0 V

AM1:     Is = 0,14 mA valid for Vg = - 5 V

DM21:   Is ***WRONG! (Is = 0,15 mA so not 0,1 mA)

EAM86: If ***WRONG! (If = 0,3 A so not 0,27 A)

EM1:     Is = 0,13 mA valid for Vg = 0 V

EM4:     Is = 2 mA valid for Vg = - 16 V

EM5:     Is = 0,46 mA valid for Vg = 0 V

EM11:   Is = 0,46 mA valid for Vg = 0 V

EM34:   Is = 2 mA valid for Vg = - 16 V

EM35:   All pins are ***WRONG!

EM71:   Is = 2,5 mA valid for Vg = 0 V

EM80:   Is = 2 mA valid for Vg = - 1 V

EM81:   Is = 2 mA valid for Vg = - 1 V

EM84:   If ***WRONG! (If = 0,21 A so not 0,27 A)

               Is = 1,1 mA valid for Vg = - 2 V

EM85:   Vi ***WRONG! (Vi = -1 … - 18 V)

               Is = 2 mA valid for Vg = 0 V

EM87:   Is = 1,8 mA valid for Vg = - 10 V

EM840: Is = 1,1 mA valid for Vg = 0 V

EMM801: Is ***WRONG! (Is = 2,5 mA at Vg = 0 V so Is can’t be 4 mA)

                    Ra1 and Ra2 ***WRONG! (Ra1 and Ra2 are 400K so not 470K)

EMM803: Is = 3,3 mA valid for Vg = 0 V

PM84:   Is = 0,6 mA valid for Vg = 0 V

UM4:     Is = 1,4 mA valid for Vg = 0 V

UM34:  Is = 1,4 mA valid for Vg = 0 V

UM80:  Ra ***WRONG! (Ra = 500K so not 470K)

               Is = 5,7 mA valid for Vg = - 1 V

UM84:  Is = 0,6 mA valid for Vg = 0 V

UM85:  Is = 7 mA valid for Vg = - 13 V and Is = 5 mA valid for Vg = 0 V

Appendix

ECC2000: Pin 1 ***WRONG! (Pin 1 = neutralization screen)

The two triode sections are not 100% identical.

EL802:   Vg ***WRONG! (Vg = - 1,3 V so not 0 V)

EY500:  R ***WRONG! (R = 300 Ohm so not 100 Ohm)

 PL802:  Vg ***WRONG! (Vg = - 1,3 V so not 0 V)

Of the 20 diagrams 4 contain one or more mistakes (= 20 %)

This article was edited 11.Sep.20 20:06 by Ernst Erb .

  
rmXorg