Electron Engine ™
Printed Circuit Boards by Emissionlabs ®
EE20 Printed Circuit Board, for Moving Coil
RELEASED PRODUCT
About the tuning circuit of this board
Possible transformers: LL1636, LL1678, LL9206, LL9226.
The MC cartridge is connected to X and X+, while the EE20 board offers several options to connect the shield, ground, etc. Also the best sounding tep up ratio can now finally quickly be found, just by trying out.
The way the transformer windings are switched, several more step up ratios have become possible as in the data sheet.
Transformer |
Board gain |
Designation |
Set Switches ON |
Set Switches OFF |
2.5x |
Possible with EE20 board |
A2, B2, B5, D1, D3 | A1, A3, B1, B3, B4, B6, D2 | |
3.3x |
Possible with EE20 board
|
A2, B1, B3, B5, D1, D3 | A1, A3, B2, B4, B6, D2 | |
5x |
Lundahl Alt A |
A2, B2, B5, D2 | A1, A3, B2, B3, B4, B6, D1, D3 | |
5x |
Lundahl Alt B |
A2, B1, B3, B4, B6, D1, D3 | A1, A3, B2, B5, D2 | |
6.7x |
Possible with EE20 board
|
A2, B1, B3, B5, D2 | A1, A3, B2, B4, B6, D1, D3 | |
10x |
Lundahl Alt C Most recommended |
A2, B1, B3, B4, B6, D2 | A1, A3, B2, B5, D1,D3 | |
10x |
Lundahl Alt D Just try it out. If no difference with Alt C, use Alt C. |
A1, A3, B1, B3, B4, B6, D1, D3 | A2, B2, B5, D2 | |
20x |
Lundahl Alt E |
A1, A3, B1, B3, B4, B6, D2 | A2, B2, B5, D1, D3 | |
4x |
Possible with EE20 board
|
A2, B2, B5, D1, D3 | A1, A3, B1, B3, B4, B6, D2 | |
5.3x |
Possible with EE20 board
|
A2, B1, B3, B5, D1, D3 | A1, A3, B2, B4, B6, D2 | |
8x |
Lundahl Alt A |
A2, B2, B5, D2 | A1, A3, B2, B3, B4, B6, D1, D3 | |
8x |
Lundahl Alt B |
A2, B1, B3, B4, B6, D1, D3 | A1, A3, B2, B5, D2 | |
11x |
Possible with EE20 board
|
A2, B1, B3, B5, D2 | A1, A3, B2, B4, B6, D1, D3 | |
16x |
Lundahl Alt C |
A2, B1, B3, B4, B6, D2 | A1, A3, B2, B5, D1,D3 | |
16x |
Lundahl Alt D |
A1, A3, B1, B3, B4, B6, D1, D3 | A2, B2, B5, D2 | |
32x |
Lundahl Alt E |
A1, A3, B1, B3, B4, B6, D2 | A2, B2, B5, D1, D3 |
LL1636 vs LL9203 or LL9226 - APPLICATION
LL1636 has an internal shield between each layer of inter sectioning, which increases the noise suppression a lot. The price for this, the room this takes internally, and so the wire diameter had to be slightly thinner, compared to LL9206. This increases the copper resistance of the LL1636 secondary from 395Ohm to 415 Ohms, however when loaded with 47k, like the standard for RIAA, this is insignificant.
LL9226 has lower copper resistance, which is better for low impedance inputs, but it fails the internal shielding of LL1636. Personally I prefer LL1636 because of the better shielding, because hum an noise is something I can hear, but the difference between 90kHz and 100kHz I can't hear that. Yet for the same reason, so to increase the linearity in this range, the adjustable damping network was added, and an LL1636 with correct adjusted damping, performs more linear than LL9226 without network added. LL9226 has a minor increase in output with very low impedance MC systems, which is it's main applications, but still here as well make the trade off between this, and the better shielding of the LL1636. (Just my personal opinion).
LL1678 - APPLICATION
LL1678 is used when you simply need 32x gain. For the cost of LL1678 there is no alternative.
In case, where you would like to use the 16x gain option, and this is SURE, this is the one to take. Yet when 16x is 'probably it' but it may as well be a little higher or lower, I would say LL1992 or LL1636 is the better choice because these can choose between 10x and 20x.