Some progress on the line stages for the modular preamp concept. As mentioned before, two different versions are planned. One with a directly heated triode, the 10Y and one with indirectly heated triode, the 6AH4, which will be basically the line section of the Octal Preamplifier Mk2.
The photo above shows the sub assemblies of the 6AH4 line. It will use Slagle TVCs and Lundahl line output transformers. 5 inputs, one of them will be transformer coupled with an input transformer with a 1:4 step up ratio.
The power supply for this line stage is already finished and tested. It just waits for the wooden enclosure:
The circuit is the same as the line section in the Octal pre Mk2.
While waiting for the next batch of wooden enclosures, I started assembly of the directly heated linestage: