Compatible Line Output Transformers

The DIY500 PCB can accept any output transformer, size EI625, with mounting holes through its lamination stack, allowing for the use of #4 machine screws to scure them to the PCB surface. While it is not recommend, some customers have used smaller size EI50 output transformers, securing them to the PCB through only one side of the lam stack.

The following output transformers reportedly meet these requirements.

All transformers with wire colors matching those printed on the DIY500 PCB should be connected accordingly.
The designations R16, C10, and R17 refer to termination components across the transformer secondary, as shown in the DIY500 schematic.
R16+C10 comprise a zobel network, when necessary.
R17 (1k5Ω by default) provides proper termination to a 600Ω line transformer when it is feeding a bridging input (often with an input impedance of 10kΩ or greater). This loading resistor can be jumpered in and out accordingly, or permanently connected, by shorting J3.
N/A means non-applicable. Leave that component out.

Brand Model Core Material Winding Structure Turns Ratio Voltage Gain (dBu) 1% THD R16 (Ω) C10 (F) R17 (Ω) Compatible
with PCB Tested? Source(s) INFO

Altran call to inquire ? litz ? ? ? ? ? ? v1 - present NO direct

Automated Processes (API) AP2503 non-grain oriented steel quadfilar 1:2 +5 (approximate) ? N/A N/A 1k2 v1 - present YES used market

Cinemag CMOB-2S M6 steel bifilar 1:1 -1 (approximate) ? N/A N/A N/A v1 - present YES direct

Cinemag CMOB-2L 50% nickel 50% steel bifilar 1:1 -0.7 +22 dBu input N/A N/A N/A v1 - present YES direct

Cinemag CMOB-2H high nickel (80%) bifilar 1:1 -0.85 +21 dBu input N/A N/A N/A v1 - present YES direct

Cinemag CMOQ-2S M6 steel quadfilar 1:2 +5.3 (approximate) ? N/A N/A 1k5 v1 - present YES direct

Cinemag CMOQ-2L 50% nickel 50% steel quadfilar 1:2 +5.7 (approximate) +22 dBu input N/A N/A N/A v1 - present YES direct

Cinemag CMOQ-2H high nickel (80%) quadfilar 1:2 +6 (approximate) +22 dBu input N/A N/A N/A v1 - present YES direct

Crimson Audio CT-2385 steel quadfilar 1:2 +5.5 (approximate) ? N/A N/A 1k5 v1 - present YES direct

Edcor XSM600/600-LD steel bifilar 1:1 ? ? ? ? ? v1 - present YES direct

Jensen JT-11-DMCF 80% nickel bifilar 1:1 -1.1 ? N/A N/A N/A v1 - present NO direct

Jensen JT-11SS-DLCF 50% nickel 50% steel split bifilar 1:2 +4.9 ? N/A N/A N/A v1 - present NO direct

Profile Electronics 4804 M6(?) steel quadfilar 1:2 +5.3 (approximate) ? N/A N/A 1k5 v1 - present YES used market

Brand Model Core Material Winding Structure Turns Ratio Voltage Gain (dBu) 1% THD R16 (Ω) C10 (F) R17 (Ω) Compatible
with PCB Tested? Source(s) INFO

Specifications subject to change without notice. GMT