Since 1993 Copyright Notice
Programming the EE27 Board Version 1 + 2
IMPORTANT: We have now Version3. We keep this page online for users of Version 1 + 2.
We recommend Version 3 for new projects.
Version 3 fits mechanically better, when transformer pins have mechanical tolerance. Also it has additional possibilities. Programming is almost the same, but not always.
THIS PAGE HERE IS ONLY INTENDED FOR USERS OF EE27 VERSION 1 and 2.
FOR NEW PROJECTS: LINK TO VERSION 3
PROGRAMMING EXAMPLE: In line #3, is written: PP to RCA Output. 2.25+2.25 : 1.
What does this mean? We drive the transformer with Push-Pull stage. Here, LL1660. A low impedance RCA output is created. Programming as you can read in line#2 is: 2, 3, 9, 10, 14, 15, 17, 18, 56, 61. Then connect power supply to Q, Tube anodes to T and P. Now the RCA connector goes to H and F. That is all there is to do! It corresponds to the data sheet "Alt N".
Line |
P/N |
Use |
Config |
ALT |
Solder |
Attach |
Notes |
|---|---|---|---|---|---|---|---|
01 |
LL1660-PP |
PP to Interstage-PP | 2.25+2.25 : 2+2 | M'' |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, Gnd=L1, Grid1=G, Grid2=C | - |
02 |
LL1660-PP |
Balanced driving an Output stage | 2.25+2.25 : 1 | N |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=T, In-=P, Grid+H, Grid-=F | Reduces noise by factor 2.3, and reduces Rp by factor 5.1. |
03 |
LL1660-PP |
PP to RCA Output | 2.25+2.25 : 1 | N |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=T, In-=P, RCA-Signal=H, RCA-Ground=F | Reduces noise by factor 2.3, and reduces Rp by factor 5.1. |
04 |
LL1660-PP |
PP to XLR Output | 2.25+2.25 : 2+2 | M'' |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=G, XLR3=C | - |
05 |
LL1660-PP-S |
PP to Interstage-PP | 2.25+2.25 : 2+2 | A |
2, 8, 13, 17, 25, 26, 30, 43, 47, 48, 55, 60 | V+=N, In+=T, In-=P, Out+=G, Out-=C, Gnd=L1+L2 | Shielded version has different pin connections. See Shielded Note |
06 |
LL1660-PP-S |
PP to XLR Output | 2.25+2.25 : 2+2 | A |
2, 8, 13, 17, 25, 26, 30, 43, 47, 48, 55, 60 | V+=N, In+=T, In-=P, XLR1=L1,XLR2=G, XLR3=C, Gnd=L2 | Shielded version has different pin connections. See Shielded Note |
07 |
LL1660-PP-Z |
Parafeed to RCA Output | 4.5 : 1 | Q-PF |
2, 3, 9, 10, 14, 15, 17, 18, 47,48, 56, 61 | CAP=K, L2=Gnd, Out+=H, Out-=F | Reduces noise by factor 4.5, and reduces Rp by factor 20.3 See Parafeed Note |
10 |
LL1660-PP-Z-S |
Parafeed to RCA Output | 4.5 : 1 | J2 |
2, 3, 9, 10, 14, 15, 17, 18, 43, 47, 48, 50, 56, 61 | CAP=M, L2=Gnd, Out+=H, Out-=F | Shielded version has different pin connections. See Shielded Note also See Parafeed Note |
11 |
LL1660-xxmA |
Special use, as anode Choke | Coils in Series | J1 |
3, 5, 14, 19, 28, 30, 43, 51, 56, 57, 58, wire from L1 to E | Choke from P to A | 95% of rated current. Inductance = 127% of Alt-S |
12 |
LL1660-xxmA |
SE to Interstage-PP | 2.25 : 2+2 | V |
2, 8, 13, 17, 25, 26, 30, 56, 58 | V+=K, In+=P, Gnd=L1, Grid1=G, Grid2=C | - |
13 |
LL1660-xxmA |
SE to Interstage-SE | 1 : 2.25 | T |
2, 7, 13, 14, 28, 20, 46, 47, 53, 58 | V+=C, In+=G, Out+=T, Gnd=L2 | Step up. Needs low Rp driver tube |
14 |
LL1660-xxmA |
SE to Interstage-SE | 4 : 4.5 | S |
2, 7, 13, 14, 28, 20, 46, 47, 53, 58 | V+=C, In+=G, Out+=T, Gnd=L2 | No Gain |
15 |
LL1660-xxmA |
SE to RCA Output | 4.5 : 1 | Q |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 4.5, and reduces Rp by factor 20.3 |
16 |
LL1660-xxmA |
SE to XLR Output | 4.5 : 1 | Q |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=K, Gnd=L2, XLR1=L1, XLR2=H, XLR3=F | Reduces noise by factor 4.5, and reduces Rp by factor 20.3 |
17 |
LL1660-xxmA |
SE to RCA Output | 4.5 : 4 | P |
2, 8, 13, 17, 25, 30, 56, 51 | V+=Q, In+=K, Out+=G, Out-=C | Alt P, same as LL1689 data sheet. |
18 |
LL1660-xxmA |
SE to XLR Output | 4.5 : 4 | P |
2, 8, 13, 17, 25, 26, 30, 56, 51 | V+=Q, In+=K, XLR1=L1, XLR2=G, XLR3=C | Alt P, same as LL1689 data sheet. |
19 |
LL1660-xxmA-S |
SE to Interstage-PP | 2.25 : 2+2 | B |
2, 8, 13, 17, 25, 26, 30, 36, 40, 43, 47, 48, 55, 61 | V+=M, In+=S, Out+=C, Out-=G, Gnd=L1+L2. Connections only for S-Version! |
Load Resistors may be connected. One from D to C, and one from to H to G. There is little space, but it is possible. See Shielded Note |
20 |
LL1660-xxmA-S |
SE to XLR Output | 2.25 : 2+2 | B |
2, 8, 13, 17, 25, 26, 36, 40, 43, 47, 48, 55, 61 | V+=M, In+=S, Gnd=L2, XLR1=L1, XLR2=G, XLR3=C Connections only for S-Version! |
Load Resistors may be connected. One from D to C, and one from to H to G. There is little space, but it is possible. |
21 |
LL1667 |
Anode Choke | Coils in Parallel | P |
2, 10, 15, 17 | Choke from A to E | 25% of rated inductance, resistance and Peak Voltage. 200% of rated current |
22 |
LL1667 |
Anode Choke | Coils in Series | S |
5, 10 | Choke from A to E | Rated data. |
23 |
LL1668 |
Anode Choke | Coils in Parallel | P |
2, 10, 15, 17 | Choke from A to E | 25% of rated inductance, resistance and Peak Voltage. 200% of rated current |
24 |
LL1668 |
Anode Choke | Coils in Series | S |
5, 10 | Choke from A to E | Rated data. |
25 |
LL1671 |
Anode Choke | Special | J1 |
3, 5, 14, 19, 28, 30, 43, 51, 56, 57, 58, wire from L1 to E | Choke from P to A | Rated current as original. Inductance = 125% of Alt-S |
26 |
LL1671-PP |
PP to XLR Output | 2.25+2.25 : 2+2 | M'' |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=G, XLR3=C | - |
27 |
LL1671-PP-Z |
Parafeed to RCA Output | 1 : 1 | S-PF |
2, 7, 13, 14, 28, 20, Wire from C to L1, 46, 47, 53, 58 | Cap=G, Gnd=L2, Out+=21 | See Parafeed Note |
28 |
LL1671-PP |
PP to Interstage-PP | 2.25+2.25 : 2+2 | M'' |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, Gnd=L1, Grid1=G, Grid2=C | See Parafeed Note |
29 |
LL1671-xxmA |
PP to RCA Output | 2+2 : 1 | N |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=T, In-=P, Out+=H, Out-=8 | Reduces noise by factor 2, and reduces Rp by factor 4 |
30 |
LL1671-xxmA |
SE to Interstage-PP | 2.25 : 2 + 2 | V |
2, 8, 13, 17, 25, 26, 30, 56, 58 | V+=K, In+=P, Gnd=L1, Grid1=G, Grid2=C | - |
31 |
LL1671-xxmA |
SE to Interstage-SE | 2 : 4.5 | T |
2, 7, 13, 14, 28, 20, 46, 47, 53, 58 | V+=C, In+=G, Out+=T, Gnd=L2 | Step up. Needs low Rp driver tube |
32 |
LL1671-xxmA |
SE to Interstage-SE | 2 : 4.5 | S |
2, 7, 13, 14, 28, 20, 46, 47, 53, 58 | V+=C, In+=G, Out+=T, Gnd=L2 | - |
33 |
LL1671-xxmA |
SE to RCA Output | 4 : 1 | Q |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 4, and reduces Rp by factor 16 |
34 |
LL1671-xxmA |
SE to XLR Output | 4 : 1 | Q |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=K, Gnd=L2, XLR1=L1, XLR2=H, XLR3=F | Reduces noise by factor 4, and reduces Rp by factor 16 |
35 |
LL1677-xxmA |
SE to Interstage-SE | 1 : 2 | A |
2, 7, 13, 15, 28, 30, 47, 51, 53, 58 | V+=C, In+=G, Grid=P, Gnd=L2 | Step up. Needs low Rp driver tube |
36 |
LL1689-PP |
PP to RCA Output | 2.3+2.3 : 1 | M |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, Out+G, Out-=C | Reduces noise by factor 2.3, and reduces Rp by factor 5.3 |
37 |
LL1689-PP |
PP to RCA Output | 4.5+4.5 : 1 | N |
5, 8, 13, 20, 22, 24, 26, 27, 29, 53, 58 | V+=Q, In+=T, In-=P, Out+=H, Out-=F | Reduces noise by factor 4.5, and reduces Rp by factor 20.3 |
38 |
LL1689-PP |
PP to RCA Output | 9+9 : 1 | O |
2, 3, 9, 10, 14, 15, 17, 18, 53, 58 | V+=Q, In+=T, In-=P, Out+=H, Out-=F | Reduces noise by factor 9, and reduces Rp by factor 81 |
39 |
LL1689-PP |
PP to XLR Output | 2.3+2.3 : 1 | M |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=G, XLR3=C | Reduces noise by factor 2.3, and reduces Rp by factor 5.3 |
40 |
LL1689-PP |
PP to XLR Output | 4.5+4.5 : 1 | N |
5, 8, 13, 20, 22, 24, 26, 27, 29, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=H, XLR3=F | Reduces noise by factor 4.5, and reduces Rp by factor 20.3 |
41 |
LL1689-xxmA |
SE to RCA Output | 18 : 1 | R |
2, 3, 9, 10, 14, 15, 17, 18, 56, 51 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 18, and reduces Rp by factor 324 |
42 |
LL1689-xxmA |
SE to RCA Output | 4.5 : 1 | P |
2, 8, 13, 17, 25, 26, 30, 56, 51 | V+=Q, In+=K, Out+=G, Out-=C | Reduces noise by factor 4.5, and reduces Rp by factor 20.3 |
43 |
LL1689-xxmA |
SE to RCA Output | 9 : 1 | Q |
2, 4, 7, 9, 13, 20, 25, 28, 56, 61 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 9, and reduces Rp by factor 81 |
44 |
LL1689-xxmA |
SE to XLR Output | 4.5 : 1 | P |
2, 8, 13, 17, 25, 26, 30, 56, 51 | V+=Q, In+=K, XLR1=L1, XLR2=G, XLR3=C | Reduces noise by factor 4.5, and reduces Rp by factor 20.3 |
45 |
LL1689-xxmA |
SE to XLR Output | 9 : 1 | Q |
2, 4, 6, 7, 9, 13, 20, 25, 28, 56, 61 | V+=Q, In+=K, XLR1=L, XLR2=H, XLR3=F | Reduces noise by factor 9, and reduces Rp by factor 81 |
46 |
LL1692A-PP |
PP to Interstage-PP | 1.75+1.75 : 2+2 | M'' |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, Gnd=L1, Grid1=G, Grid2=C | - |
47 |
LL1692A-PP |
PP to XLR | 1.75+1.75 : 2+2 | M'' |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=G, XLR3=C | - |
48 |
LL1692A-PP-Z |
Parafeed to RCA Output | 4 : 3.5 | S-PF |
2, 7, 13, 14, 28, 20, Wire from C to L1, 46, 47, 53, 58 | Cap=G, Gnd=L2, Out+=21 | Reduces noise by factor 1.1, and reduces Rp by factor 1.3 See Parafeed Note |
49 |
LL1692A-xxmA |
PP to RCA Output | 1.75+1.75 : 1 | N |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=T, In-=P, Out+=H, Out-=8 | Reduces noise by factor 1.8, and reduces Rp by factor 3.1 |
50 |
LL1692A-xxmA |
SE to Interstage-PP | 1.75 : 2+2 | V |
2, 8, 13, 17, 25, 26, 30, 56, 58 | V+=K, In+=P, Gnd=L1, Grid1=G, Grid2=C | - |
51 |
LL1692A-xxmA |
SE to Interstage-SE | 2 : 3.5 | T |
2, 7, 13, 14, 28, 20, 46, 47, 53, 58 | V+=C, In+=G, Out+=T, Gnd=L2 | - |
52 |
LL1692A-xxmA |
SE to Interstage-SE | 4 : 3.5 | S |
2, 7, 13, 14, 28, 20, 46, 47, 53, 58 | V+=C, In+=G, Out+=T, Gnd=L2 | Reduces noise by factor 1.1, and reduces Rp by factor 1.3 |
53 |
LL1692A-xxmA |
SE to RCA Output | 3.5 : 1 | Q |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 3.5, and reduces Rp by factor 12.3 |
54 |
LL1692A-xxmA |
SE to XLR Output | 3.5 : 1 | Q |
2, 3, 9, 10, 14, 15, 17, 18, 56, 61 | V+=Q, In+=K, Gnd=L2, XLR1=L1, XLR2=H, XLR3=F | Reduces noise by factor 3.5, and reduces Rp by factor 12.3 |
55 |
LL2745-PP |
PP to RCA Output | 2.8+2.8 : 1 | O |
2, 3, 9, 10, 14, 15, 17, 18, 53, 58 | V+=Q, In+=T, In-=P, Out+=H, Out-=F | Reduces noise by factor 2.8, and reduces Rp by factor 7.8 |
56 |
LL2745-PP |
PP to RCA Output | 1.4+1.4 : 2 | M |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, Out+G, Out-=C | - |
57 |
LL2745-PP |
PP to RCA Output | 1.4+1.4 : 1 | N |
5, 8, 13, 20, 22, 24, 26, 27, 29, 53, 58 | V+=Q, In+=T, In-=P, Out+=H, Out-=F | Reduces noise by factor 1.4, and reduces Rp by factor 2 |
58 |
LL2745-PP |
PP to XLR Output | 1.4+1.4 : 2 | M |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=G, XLR3=C | - |
59 |
LL2745-PP |
PP to XLR Output | 1.4+1.4 : 1 | N |
5, 8, 13, 20, 22, 24, 26, 27, 29, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=H, XLR3=F | Reduces noise by factor 1.4, and reduces Rp by factor 2 |
60 |
LL2745-PP-Z |
Parafeed to RCA | 5.6 : 1 | R-PF |
2, 3, 9, 10, 14, 15, 17, 18, 43, 47, 56, 61 | CAP-In=Q, Gnd=L2, Out+=H, Out-=F | Reduces noise by factor 5.6, and reduces Rp by factor 31.4 See Parafeed Note |
61 |
LL2745-xxmA |
SE to RCA Output | 5.6 : 1 | R |
2, 3, 9, 10, 14, 15, 17, 18, 56, 51 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 5.6, and reduces Rp by factor 31.4 |
62 |
LL2745-xxmA |
SE to RCA Output | 1.4 : 1 | P |
2, 8, 13, 17, 25, 26, 30, 56, 51 | V+=Q, In+=K, Out+=G, Out-=C | Reduces noise by factor 1.4, and reduces Rp by factor 2 |
63 |
LL2745-xxmA |
SE to RCA Output | 2.8 : 1 | Q |
2, 4, 7, 9, 13, 20, 25, 28, 56, 61 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 2.8, and reduces Rp by factor 7.8 |
64 |
LL2745-xxmA |
SE to XLR Output | 1.4 : 1 | P |
2, 8, 13, 17, 25, 26, 30, 56, 51 | V+=Q, In+=K, XLR1=L1, XLR2=G, XLR3=C | Reduces noise by factor 1.4, and reduces Rp by factor 2 |
65 |
LL2745-xxmA |
SE to XLR Output | 2.8 : 1 | Q |
2, 4, 6, 7, 9, 13, 20, 25, 28, 56, 61 | V+=Q, In+=K, XLR1=L, XLR2=H, XLR3=F | Reduces noise by factor 2.8, and reduces Rp by factor 7.8 |
66 |
LL2754-PP |
PP to Head Phone | 1:1 | Q |
4, 10, 43, 51, 56, 58 | In+=A, In-=F, In=H, Out+=T, Out-=P | For Low Impedance Head phone (32-50 Ohms) |
67 |
LL2754-PP |
PP to Head Phone | 1:2 | Q |
4, 10, 43, 48 | In+=A, In-=F, In=H, Out+=T, Out-=P | For High Impedance Head phone (300-600 Ohms) |
68 |
LL2754-xxmA |
SE to Head Phone | 1:1 | Q |
2, 10, 14, 18, 46, 48, 53, 61 | V+=C, In=H, Out+=T, Out-=P | For Low Impedance Head phone (32-50 Ohms) |
69 |
LL2754-xxmA |
SE to Head Phone | 1:2 | Q |
2, 10, 14, 18, 43, 48, | V+=C, In=H, Out+=T, Out-=P | For High Impedance Head phone (300-600 Ohms) |
70 |
LL2763-PP |
PP to RCA Output | 4+4 : 1 | O |
2, 3, 9, 10, 14, 15, 17, 18, 53, 58 | V+=Q, In+=T, In-=P, Out+=H, Out-=F | Reduces noise by factor 4, and reduces Rp by factor 16 |
71 |
LL2763-PP |
PP to RCA Output | 1+1 : 1 | M |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, Out+G, Out-=C | - |
72 |
LL2763-PP |
PP to RCA Output | 2+2 : 1 | N |
5, 8, 13, 20, 22, 24, 26, 27, 29, 53, 58 | V+=Q, In+=T, In-=P, Out+=H, Out-=F | Reduces noise by factor 2, and reduces Rp by factor 4 |
73 |
LL2763-PP |
PP to XLR Output | 1+1 : 1 | M |
2, 8, 13, 17, 25, 26, 30, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=G, XLR3=C | - |
74 |
LL2763-PP |
PP to XLR Output | 2+2 : 1 | N |
5, 8, 13, 20, 22, 24, 26, 27, 29, 53, 58 | V+=Q, In+=T, In-=P, XLR1=L1, XLR2=H, XLR3=F | Reduces noise by factor 2, and reduces Rp by factor 4 |
75 |
LL2763-PP-Z |
Parafeed to RCA Output | 8 : 1 | R-PF |
2, 3, 9, 10, 14, 15, 17, 18, 43, 47, 56, 61 | CAP-In=Q, Gnd=L2, Out+=H, Out-=F | Reduces noise by factor 8, and reduces Rp by factor 64 See Parafeed Note |
76 |
LL2763-xxmA |
SE to RCA Output | 8 : 1 | R |
2, 3, 9, 10, 14, 15, 17, 18, 56, 51 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 8, and reduces Rp by factor 64 |
77 |
LL2763-xxmA |
SE to RCA Output | 2 : 1 | P |
2, 8, 13, 17, 25, 26, 30, 56, 51 | V+=Q, In+=K, Out+=G, Out-=C | Reduces noise by factor 2, and reduces Rp by factor 4 |
78 |
LL2763-xxmA |
SE to RCA Output | 4 : 1 | Q |
2, 4, 7, 9, 13, 20, 25, 28, 56, 61 | V+=Q, In+=K, Out+=H, Out-=F | Reduces noise by factor 4, and reduces Rp by factor 16 |
79 |
LL2763-xxmA |
SE to XLR Output | 2 : 1 | P |
2, 8, 13, 17, 25, 26, 30, 56, 51 | V+=Q, In+=K, XLR1=L1, XLR2=G, XLR3=C | Reduces noise by factor 2, and reduces Rp by factor 4 |
80 |
LL2763-xxmA |
SE to XLR Output | 4 : 1 | Q |
2, 4, 6, 7, 9, 13, 20, 25, 28, 56, 61 | V+=Q, In+=K, XLR1=L, XLR2=H, XLR3=F | Reduces noise by factor 4, and reduces Rp by factor 16 |
