Hi Nightanole
Cheers
I was going you use that design for the thermal switch but already had the parts for the design I ended up using.
Cheers
apurcell22
Ok, I turned the fan off today, temp outside was about 21c and she run fairly hot with a bit of Groove Armada pumping! (setting the mood for my daughters 16th birthday party!) I will put a thermocouple on it tomorrow and re-post.
What speakers are you running?
Ok, I turned the fan off today, temp outside was about 21c and she run fairly hot with a bit of Groove Armada pumping! (setting the mood for my daughters 16th birthday party!) I will put a thermocouple on it tomorrow and re-post.
What speakers are you running?
Have used klipsch lascalas, klipsch rf-82, jbl book shelf can't remember the model, goodman axiom 400, and a pair of Ariel tl's I'm sure I forgot a few.
Al
Al
Well covered then!!! lol
The La Scala's look like they would sound awsome??
I only have a little pair of Kef Q10's hooked up at the moment but plan to make a pair of OB's later this year.
Cheers
The La Scala's look like they would sound awsome??
I only have a little pair of Kef Q10's hooked up at the moment but plan to make a pair of OB's later this year.
Cheers
After what seems like forever, my amp survived the "smoke test" today, and is playing happily in my desktop/computer system, driving a pair of Alpair 6PeN's in P10 boxes. The amp drives these speakers with authority, and sounds surprisingly good, with only a couple of hours of playing time.
A big "shout out" (and thanks) to Pete for designing a very nice amp.
jeff
A big "shout out" (and thanks) to Pete for designing a very nice amp.
jeff
I have had mine on my work bench since this summer. Not having time and trying to decide what kind of chassis to put this on has set me back quite a bit. I have drawn up numerous designs. None appeal to me. Four transformers, two huge 600uf caps, and the big red board makes for one giant single chassis amplifier. A separate power supply might be the best choice at this point. I would like to just get this cased up so I can again play some music through it. Any ideas from anyone? I have been trying to find some nice aesthetics but I have gotten sick of looking at wooden bases.
After what seems like forever, my amp survived the "smoke test" today, and is playing happily in my desktop/computer system, driving a pair of Alpair 6PeN's in P10 boxes. The amp drives these speakers with authority, and sounds surprisingly good, with only a couple of hours of playing time.
A big "shout out" (and thanks) to Pete for designing a very nice amp.
jeff
Yeah... Jeff, it is a great sounding amp. Mine has been playing strong and trouble-free for well over a year now. Doesn't seem to care what sort of speakers it is driving.
And yes, Mr. Millett really knows his stuff. If you think the "Engineer's Amp" sounds good, just wait 'til you build his "Uniamp" Monoblocks (pic attatched of mine). They are just so incredibly good, they may be the last DIY amps I ever build.
Attachments
I've got a bit of hum in the right channel. I changed out one of the 6JM6's, thinking the filament looked a little dull compared to the others. No change in the hum. I then decided to check the heater voltage, which measures 5.4v off the transformer, and 5.3v at the tubes.😡
jeff
jeff
Don't quit yet! I have another P-P design on the breadboard right now... using KT88's (or any other output tube), pentode diff amp driver, local and (gasp) global NFB... flat to almost 100kHz, ~0.007% THD @ 1W, 0.04% @ 10W, ~40W max... (much) more if you "Tubelab" it!
Pete
I've run in triode and ultralinear mode (those measurements were UL). You could certainly run pentode as well - I don't think I measured that yet.
I've been using E80L pentodes as the driver - I'll try 12BY7A next. Using a 6J5/8532 input tube, with gNFB to the cathode.
This board will be more flexible than the big red board. Only the input and driver - for one channel - on the PCB. No power supply or other components. You can also apply local feedback from the output tube plates, or ultralinear taps, to the driver plate. So you can set it up in a number of different ways, and use whatever output tube(s) you want.
I just ordered proto PCBs, so it'll be a little while yet. I might try and post some early info on the web site in the next couple of weeks.
Pete
OK you got my attention.
I assume you mean 6J4. Good tube and I have a few hundred of them.
There is a long list of tubes that will work in that socket if you left pin 6 open. Some are real nice for cheap and haven't been "discovered" yet.
Wait a minute this sounds like one of my universal driver boards......have you been reading my mind.....does it have mosfet drivers for jamming current into grids for AB2 or even screen drive?????
Sounds very interesting. Any chance the boards will come as dual mono, so they could be split if someone wanted to build mono-block amps?
jeff
Doh... yes.
Not THAT universal. Actually pretty conventional, especially for me!
That's great.
Today I figured out where the hum is coming from. One of the 6BZ6 driver tubes has a problem. Now that channel won't balance, but the amp still sounds great!
jeff
OK then, Pete, the Uniamp monos may not be my "last" DIY project
Your PCB's are just too tempting not to heat up the iron!
Looking forward to ordering. Please keep us posted here.
I am sold. Pete's design, DCPP, has put all my other stuff, commercial, to shame. I will be jumping on the next one for sure.
Thanks Pete!
Thanks Pete!
I'm starting to think three boards with a significantly beefy power supply might just be the perfect thing for an L/C/R home theater amp...
My DCPP is currently anchoring the left and right channels of my home theater. I'd love to move it upstairs and switch it out occasionally with my Fisher 800c.