iRIAA preamplifier prototype

[EposLab]

It's been a long time I was thinking of building one of these.
I started with a single channel version as my lathe system is Monophonic.

This Prototype features:
- ALPS Input Volume Control
- Accurate iRIAA eq
- 40dB of total gain
- Low Pass Filter for 12kHz & 16kHz
- Fuse protection for the Cutterhead
- Adjustable VU meter for the Cutterhead
- Custom PCB , Mica caps & Dale resistors

Specifications:
- 2x18Vac external PSU
- Maximum Input signal : 2Vp-p @20Hz - 20kHz
- Maximum Output signal : 200mVp-p @20Hz , 2Vp-p @1kHz , 20Vp-p @20kHz
- 1U 19" rack mount
- Grey Wrinkle painted faceplate

I am currently testing it and looking for a way to print on faceplate and back. Sound performance is excellent and soon will make some measurements.
Any recommendation is welcome

IMG_20220623_001238.jpg

IMG_20220623_001257.jpg

IMG_20220624_105331.jpg

IMG_20220624_105323.jpg

[emidisc]

Looking good
I have some basic question
1. Presumably for mono you would require 1x iRIAA unit + 1 x PSU unit?
2. For Stereo 2 x iRIAA unit + 1 x PSU unit?
3. Have you got an Approx target Price?

Personally I would be interested in a Mono set-up that could possibly be upgraded to stereo later

Emidisc

[EposLab]

Looking good
I have some basic question
1. Presumably for mono you would require 1x iRIAA unit + 1 x PSU unit?
2. For Stereo 2 x iRIAA unit + 1 x PSU unit?
3. Have you got an Approx target Price?

Personally I would be interested in a Mono set-up that could possibly be upgraded to stereo later

Emidisc

Well there are lots of options there! This prototype I built for my needs cause (as of now) I use a single channel , Monophonic lathe system!
For 2 channel system (stereo) can be done by using 2x single channel iraa preamps (2x PSU) or make a stereo preamp in one case using a single PSU.

I am still testing it so this will need some time for it. One thing is for sure : the more I use it , the more I like it