randerson07
Active Member
maybe this can be an interesting read for that sure amp
http://www.trevormarshall.com/class-d-tutorial/
Interesting yes, but way above my skill level.
maybe this can be an interesting read for that sure amp
http://www.trevormarshall.com/class-d-tutorial/
Originally I was going to use the old amp case and try to stuff a 3116 and tube pre in it. Think I'll just go with a dual mono power amp and input selector in on box and do something separate for the tube pre. Here's where I am at - waiting for blue LED power indicator and new selector switch from the bay. Shown without original face plate which I'll probably spray paint black. The brick in the middle is 19 V 10A. Both boards modded and tested. Work in progress....
some of it is on a level above me too but that is only relevant if you want to implement such improvements/mods to other designs. If you take the same ampboard doing the mods shown isn't more complicated then wiring a pot (I need to check and recheck everytime I do a pot)Interesting yes, but way above my skill level.
HI All,
I have finished the amp.
It has three inputs, 21 Step potentiometer progressive potentiometer dual 50k Volpot that sound better then my Alps blue and has a nice action.
Retro red LED fed from the LM338reg PCB, 6.6A transformer.
Russian 6N3EV valves.
Chassis damped with heavy rubber matting.
So far I am very pleased with the sound, very clean. It needs a few hours of burn in before knowing in full.
Many Thanks
Ian
Well I took the plunge- I have followed the many of you down the 3 tube pre and TPA 3116 hole. I ordered all last week, and received the 3116 in the mail yesterday (less than a week from Hong Kong to CA!!).
This is my first project (besides your standard cleaning/DeOxit)- one question at this point. I have a Mac power supply on hand showing: 24.5V, 2.65A and 65W. The voltage is right for this application but is the amperage? Seems lower than what I seem to recall seeing in this thread- around 4.5A I believe.
Will this power supply do the trick??
I tried a 12V 3A PS and it didn't work well. My 12v 5A works fine. I have a 24 V 5A PS that actually measures 24.5V that works great, but the chip gets pretty warm. I have added some home-made heat sink extenders and they seem to keep the chip cooler. If you can find a laptop PS 18-20v 5-6A that should work good. A 12V battery also works.