Aermotor Studio

Hello

Here you will find parts lists for the different types of ways you can assemble the Eisen Audio DIY 500 pres. Please contribute by sending me circuits you have built to be added to the list. Thanks!
info@aermotorstudio.com

Circuits

API Clean
API Vintage
API 512
Neve-ish
Hardy 990

API Clean / Straight forward great sound like BAE 312a / By Jens

Avedis 1122 Opamp
Cinemag CMMI-8PCA Input Transformer
Cinemag CMOQ-2L Output Transformer

D1, D2, D3 = short
J1 = short
J2 = 47 ohms
J3 = short
J4, J5 = N/A
R1, R10, R11 = 10 ohms, 3/4W or 1W %5
R2, R3 = 6k8 ohms
R4, R5 = 680 ohms
R6 = 150 ohms
R7, R17 = N/A
R8 = 100k ohms
R9 = short
R9a = N/A
R12 = 10k ohms
R13 = 100 ohms
R14 = short
R15 = N/A
R16 = 1k5 ohms
C1 = between 10uF and 82uF (anything will work), 63V radial electrolytic
C2, C3, C4 = N/A
C5, C6 = 100uF 25V radial electrolytic
C7 = 100pF 50V or 100V, C0G/NP0 ceramic is ideal
C8 = 470uF 6.3V or more radial or axial. Bipolar/non-polar preferred, otherwise positive lead faces front panel.
C9 = 470uF 16V bipolar/non-polar radial electrolytic (or 1000uF if it fits cannot exceed 25mm!)
C10 = N/A

API Vintage / Warmer sound, huge low end / By Jens

SL-2520 "Vintage" Opamp
Cinemag CM-75101APC Input Transformer
Cinemag CMOQ-2L Output Transformer

D1, D2, D3 = short
J1 = short
J2 = 47 ohms
J3 = short
J4, J5 = N/A
R1, R10, R11 = 10 ohms, 3/4W or 1W %5
R2, R3 = 6k8 ohms
R4, R5 = 680 ohms
R6 = 150 ohms
R7, R17 = N/A
R8 = 150k ohms
R9 = short
R9a = N/A
R12 = 10k ohms
R13 = 100 ohms
R14 = short
R15 = N/A
R16 = 1k5 ohms
C1 = between 10uF and 82uF (anything will work), 63V radial electrolytic
C2, C3, C4 = N/A
C5, C6 = 100uF 25V radial electrolytic
C7 = 100pF 50V or 100V, C0G/NP0 ceramic is ideal
C8 = 470uF 6.3V or more radial or axial. Bipolar/non-polar preferred, otherwise positive lead faces front panel.
C9 = 470uF 16V bipolar/non-polar radial electrolytic (or 1000uF if it fits cannot exceed 25mm!)
C10 = N/A

API 512 Modern / By Jens

API 2520 or Fabio 2520
Jensen JT-115K-EPC Input Transformer
Cinemag QMOQ2S Output Transformer

D1, D2, D3 = 1N4003
J1 = N/A
J2 = 47 ohms
J3 = short
J4, J5 = N/A
R1 = 1k ohms
R1, R10, R11 = 10 ohms, 3/4W or 1W %5
R2, R3 = 6k8 ohms
R4, R5 = 620 ohms
R6 = 162 ohms
R7 = N/A
R8 = 162k ohms
R9 = 1k
R9a = 1M ohms
R10, R11 = short
R12 = 10k ohms
R13 = 100 ohms
R14 = short
R15, R16 = N/A
R17 = 1k5 ohms
C1 = 10uF or greater, 63V radial electrolytic
C2, C4 = N/A
C3 = 10uF, 16V or greater bipolar/non-polar radial electrolytic
C5, C6 = 100uF, 25V or greater radial electrolytic
C7 = 100pF 50V C0G/NP0 ceramic
C8 = 330uF 10V bipolar/non-polar radial electrolytic
C9 = 470uF 16V bipolar/non-polar radial electrolytic (or 1000uF if it fits cannot exceed 25mm!)
C10 = N/A

Neve-ish Base Configuration / By Jens

Purple Audio KDJ 4 op amp
Carnhill VTB9045 Input Transformer, wired 1k2:5k, with Keystone 621 right angle brackets
Crimson Audio CT-2385 or Cinemag CMOQ-22 Output Transformer, wired 1:2, with the fourth winding unused

D1, D2, D3 = short
J1 = N/A
J2 = N/A
J3 = short
J4, J5 = N/A
R1, R10, R11 = 10 ohms, 3/4W or 1W %5
R2, R3 = 6k8 ohms
R4, R5 = 470 ohms
R6 = 200 ohms
R7 = short
R8 = 5k6 ohms
R9 = 100 ohms
R9a = 100k ohms
R12 = 13k ohms
R13 = 30 ohms
R14 = 68 ohms
R15 = 100k ohms
R16 = N/A
R17 = 1k2
C1 = between 10uF and 82uF (anything will work), 63V radial electrolytic, bypassed with 0.1uF 50V metalized polyester film
C2 = 180pF 50V film, mica, or ceramic
  C3 = 0.47uF 16V tantalum bead
C4 = N/A
C5, C6 = 100uF 25V radial electrolytic, bypassed with 0.1uF 50V metalized polyester film
C7 = 68pF 50V or 100V, C0G/NP0 ceramic is ideal
C8 = 220uF, between 6.3V and 16V bipolar/non-polar radial electrolytic
C9 = 470uF 16V bipolar/non-polar radial electrolytic
C10 = N/A

Hardey 990 / By Jens

990c Opamp
Cinemag CMMI-2C PC Input Transformer
Cinemag CMOQ-2H Output Transformer

D1, D2, D3 = short
J1 = short
J2 = N/A
J3 = N/A
J4, J5 = N/A
R1, R10, R11 = 10 ohms, 3/4W or 1W %5
R2, R3 = 6k8 ohms
R4, R5 = 680 ohms
R6 = 150 ohms
R7, R17 = N/A
R8 = 6k2 ohms
R9 = short
R9a = N/A
R12 = 10k ohms
R13 = 20 ohms
R14 = 39 ohms
R15 = 100k
R16 = N/A
C1 = between 10uF and 82uF (anything will work), 63V radial electrolytic
C2, C3, C4 = N/A
C5, C6 = 100uF 25V radial electrolytic
C7 = 91pF 50V or 100V, C0G/NP0 ceramic is ideal
C8 = 470uF 6.3V or more radial or axial. Bipolar/non-polar preferred, otherwise positive lead faces front panel.
C9 = 470uF 16V bipolar/non-polar radial electrolytic (or 1000uF if it fits cannot exceed 25mm!)
C10 = N/A