MIG-LR/S Tube Preamp for Transistor Leslies
Due to quality issues (microphonic effects) on late russian surplus tubes available on the market today, the MIG-LR tube preamp is no longer available by KeyboardPartner. I don't have any parts or PCBs left. But if you happen to get one of these tubes, you can make your own MIG-LR by etching a PCB and soldering your own parts. Tubes 1SH18b (1J18b) and 1SH24b (1J24b) may be used; choose anode resistor (22kOhms to 47kOhms) to yield anode voltage of 12 to 15 V on 28V power supply. ICs used are CMOS logic types CD4066 and CD4069 (best sounding are made by Phillips/NXP).
Complete description (old KeyboardPartner site)
Dokumentation/Installation Manual - Download als PDF
(english) Documentation/Installation Manual - Download as PDF
Latest version, schematics PDF
Latest version, silk/parts placement PDF
Russian tube datasheets are available here
Please note: Permission granted for private use only, commercial use prohibited. (c) by C. Meyer 2005.