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Old 5th July 2020, 03:25 PM   #2711
TungstenAudio is online now TungstenAudio  United States
diyAudio Member
Join Date: Jan 2014
Location: Kenmore, WA
While I am waiting for Edcor to build a set of vacuum tube style power transformers for me, I am trying the ACP+ with my MoFo monoblocks. I went with the ACP+ because it uses a single power rail and can be easily built into the same chassis as my monoblocks. Since my MoFo boards are running at 26V, I needed to use higher resistance in the power supply filter for the ACP+. I have increased the gain slightly to 11.5 dB. The first channel has the ACP+ board running at 24V, and the second channel is still work in progress. I am seeing somewhat higher measured THD than I expected, but I'm waiting to listen to the amps before making a final judgement.

I plan to build two sets of tube preamps to replace the top plate of monoblock chassis. I'll be starting with higher B+ voltage and using tube rectifiers that have 6V filaments. There is a 6SN7 "Blue Velvet Preamp" design by Dick Olsher that I want to try, and another "Nishiki" gain stage with 5965 tubes that I want to try as well.


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