hmbscott
New member
I installed SUT's in my custom Eros 2 recently. Custom, because originally I used a custom made chassis plate without mounting provisions for SUT's (see Pic 1). I recently decided to explore LOMC cartridges to use with my Eros. That necessitated SUT's either external or built in.
I opted for built in, and so I either needed to drill mounting holes in my existing chassis plate, or replace it with a new one. Both options have their risks. I decided to design a new chassis plate, which enabled several other desired changes too. Along with the SUT mounting provisions, I included better cooling around the tubes and the transformer, changed the chassis material from aluminum to copper, and created a new paint scheme.
I wanted to retain both the original HOMC/MM circuit and add the 10:1 SUT (Sowter 1480e). That requires switching the SUT's. Pic 2 shows the Left channel of circuit wiring I used to accomplish this. I selected a miniature 4PDT switch placed between the SUT and the RCA Jack. The placement minimized wiring distances. On the new chassis plate, the RCA sockets are moved a bit closer together to make room for the 4PDT switches.
This project entailed removing all the components from the original chassis and reinstalling them on the new chassis, a somewhat nerve wracking process, to say the least. I disassembled the circuit in chunks as large as possible, carefully bagged and labeled, and kept careful notes on disassembly and reassembly order (see Pic 3). I'm pleased to report that reassembly was successful. The SUT primary coils are grounded to the Eros circuit ground to eliminate hum. The SUT circuit displays a lower noise floor than the original circuit.
Pic 4 shows the SUT's and switches installed and wired. Pic 5 shows the finished Eros with SUT's installed and it's new paint job. Oh yeah, it sounds absolutely amazing with the new SUT's and my new Hana ML riding vinyl.
I opted for built in, and so I either needed to drill mounting holes in my existing chassis plate, or replace it with a new one. Both options have their risks. I decided to design a new chassis plate, which enabled several other desired changes too. Along with the SUT mounting provisions, I included better cooling around the tubes and the transformer, changed the chassis material from aluminum to copper, and created a new paint scheme.
I wanted to retain both the original HOMC/MM circuit and add the 10:1 SUT (Sowter 1480e). That requires switching the SUT's. Pic 2 shows the Left channel of circuit wiring I used to accomplish this. I selected a miniature 4PDT switch placed between the SUT and the RCA Jack. The placement minimized wiring distances. On the new chassis plate, the RCA sockets are moved a bit closer together to make room for the 4PDT switches.
This project entailed removing all the components from the original chassis and reinstalling them on the new chassis, a somewhat nerve wracking process, to say the least. I disassembled the circuit in chunks as large as possible, carefully bagged and labeled, and kept careful notes on disassembly and reassembly order (see Pic 3). I'm pleased to report that reassembly was successful. The SUT primary coils are grounded to the Eros circuit ground to eliminate hum. The SUT circuit displays a lower noise floor than the original circuit.
Pic 4 shows the SUT's and switches installed and wired. Pic 5 shows the finished Eros with SUT's installed and it's new paint job. Oh yeah, it sounds absolutely amazing with the new SUT's and my new Hana ML riding vinyl.
