Build This MoFo! - Page 272

TungstenAudio · 5th July 2020, 03:25 PM

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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Adapt Polk Audio R20 for Classix II build or build box?	unpredictableape	Multi-Way	3	3rd April 2017 07:25 AM
Power Acoustik MOFO 10, need box dimensions	Spuddd	Subwoofers	2	5th January 2017 10:46 AM
LJM MX50-SE - Build Log Gallery & My Build Progress	dakku	Solid State	3	28th October 2016 08:49 AM
Do i need to build main supply (240v) filter?Or build power distribution?	thomgun_lc	Chip Amps	9	16th September 2005 09:52 AM
Power Acoustik MOFO-10 Sub	subwo1	Car Audio	1	24th October 2003 08:12 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

5th July 2020, 03:25 PM	#2711
TungstenAudio 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.