jusmu
New member
- Joined
- Oct 22, 2016
- Messages
- 3
Hello.
I'm starting a project to convert Akai M7 tube tape recorder into tube preamps.
Power transformer gives 250v-ct-250v(60ma), 6,3v twice and 5,7v which was used to heat up EF86 in the original.
Seems that since I plan to have +48v option in this preamp I need to produce it somehow.
I have an extra toroid tranny that gives 12v twice so I guess tripling and regulating that I can archive wanted phantom power that?
- It already has EZ90 rectifier, go or not?
- Wondering does it give me any trouble to have to powers, where another is producing +48v?
- Is there any point to use those oa2 tubes for regulating?
- Sowter or Lundahl?
- How to utilise original VU meter?
regards
I'm starting a project to convert Akai M7 tube tape recorder into tube preamps.
Power transformer gives 250v-ct-250v(60ma), 6,3v twice and 5,7v which was used to heat up EF86 in the original.
Seems that since I plan to have +48v option in this preamp I need to produce it somehow.
I have an extra toroid tranny that gives 12v twice so I guess tripling and regulating that I can archive wanted phantom power that?
- It already has EZ90 rectifier, go or not?
- Wondering does it give me any trouble to have to powers, where another is producing +48v?
- Is there any point to use those oa2 tubes for regulating?
- Sowter or Lundahl?
- How to utilise original VU meter?
regards