Of course you can mount any parts on the opposite side of the board. Just be careful with caps to observe correct polarity, and when handling the board before it's mounted to the chassis, and make sure your standoffs are long enough and the enclosure is tall enough.
How do you all mount heatsinks? In the past, I have used L-brackets bolted to the heatsink and then to the floor of the chassis. Got an idea at the hardware store for this new pair of amps: the heatsinks are 2-3/4" tall with slightly more than 1/4" between fins, so I got a couple 1/4" carriage bolts (smooth round head with a square shoulder between the threads and the bolt head) 3-1/2" long. Drilled clearance holes in the chassis bottom and now I plan to run the bolts vertically between the heatsink fins and bolt from the bottom of the chassis, same as holding a toroidal transformer. See any problems?
Yesterday I was fortunate to attend a program of Brahms' chamber music played by UW faculty at the university art museum: "Sunday afternoon live from the Chazen," which is simulcast on the local NPR station. The gallery where they play is huge, probably 50ft x 90ft or more with a twenty foot ceiling, with about a hundred people in the audience, surrounded by beautiful 18th and 19th century works of art. I was seated 20 feet from the players, exact center. There was a Steinway grand piano, clarinet, and cello performing Brahms Clarinet Trio. Excellent music, played very well. So naturally when I got home I played my Hyperion recording (decent, but not "audiophile standard") of the same music to compare. Of course my 12 x 20 listening room and 60 watt amps could not duplicate the dynamics or space, but there was remarkable fidelity of tone and timbre. The clarinet was nearly perfectly reproduced, although the piano and cello were a little recessed on the recording, but they sounded very similar in tone. I am quite pleased with the overall accuracy of tonality.
Great news that the TC's are available in the US, assuming they are actually in stock. Thanks for your efforts, Bob.
Peace,
Tom E
How do you all mount heatsinks? In the past, I have used L-brackets bolted to the heatsink and then to the floor of the chassis. Got an idea at the hardware store for this new pair of amps: the heatsinks are 2-3/4" tall with slightly more than 1/4" between fins, so I got a couple 1/4" carriage bolts (smooth round head with a square shoulder between the threads and the bolt head) 3-1/2" long. Drilled clearance holes in the chassis bottom and now I plan to run the bolts vertically between the heatsink fins and bolt from the bottom of the chassis, same as holding a toroidal transformer. See any problems?
Yesterday I was fortunate to attend a program of Brahms' chamber music played by UW faculty at the university art museum: "Sunday afternoon live from the Chazen," which is simulcast on the local NPR station. The gallery where they play is huge, probably 50ft x 90ft or more with a twenty foot ceiling, with about a hundred people in the audience, surrounded by beautiful 18th and 19th century works of art. I was seated 20 feet from the players, exact center. There was a Steinway grand piano, clarinet, and cello performing Brahms Clarinet Trio. Excellent music, played very well. So naturally when I got home I played my Hyperion recording (decent, but not "audiophile standard") of the same music to compare. Of course my 12 x 20 listening room and 60 watt amps could not duplicate the dynamics or space, but there was remarkable fidelity of tone and timbre. The clarinet was nearly perfectly reproduced, although the piano and cello were a little recessed on the recording, but they sounded very similar in tone. I am quite pleased with the overall accuracy of tonality.
Great news that the TC's are available in the US, assuming they are actually in stock. Thanks for your efforts, Bob.
Peace,
Tom E
Nice report and great results Tom. I've fallen into the trap of becoming a news junkie and have those TV channels in the background as I fiddle with my projects. I'm going to switch back to Delta College FM cause I miss announcements of events like that. Winford Marsallis and the Lincon Center Jazz group performed six miles away from my house a few weeks ago and I was completely unaware.
Are you still experimenting with room treatment ideas? I have two side wall baffles for early reflection but nothing front to back yet.
Are you still experimenting with room treatment ideas? I have two side wall baffles for early reflection but nothing front to back yet.
Oh , with my "attention" to diy I start to forget everything 🙂 No time...
Q: If I run wire from earth on iec inlet right under and attach it to the enclosure floor will it be sufficient grounding ?
Q: If I run wire from earth on iec inlet right under and attach it to the enclosure floor will it be sufficient grounding ?
And I m again with those switches...I run live to C (common) and from NO (normally open) I run wire into transformer live ?
I promise I ll finish wiring amp today or tomorrow 🙂 it took too long to get this sorted :/
Amp was used with no switches or lights at all...
I promise I ll finish wiring amp today or tomorrow 🙂 it took too long to get this sorted :/
Amp was used with no switches or lights at all...
Ok, here it is
a: iec earth to chassis ground (top middle)
b: switch wiring is fine, figured it myself 😀
c: and my solution to over sized capacitors
d: switch led needs 12v but will be too bright so voltage could be lower than 9v, as well will add 2x ext led to the front panel
d: severe weather conditions 🙁
Wires will be restrained with adhesive clips (waiting for delivery)
a: iec earth to chassis ground (top middle)
b: switch wiring is fine, figured it myself 😀
c: and my solution to over sized capacitors
d: switch led needs 12v but will be too bright so voltage could be lower than 9v, as well will add 2x ext led to the front panel
d: severe weather conditions 🙁
Wires will be restrained with adhesive clips (waiting for delivery)
Attachments
Assuming the iec connector you have has a fuse at the bottom, isn't the Neutral the one on the top (on that side) and the Live the one underneath it?
Geoff
Just finished second of two new amps. These feature all premium parts with Mundorf M-Lytic PS caps, TC coupling caps, Vishay naked Z-foil's at R10 and R12, BG Std's at C9, stacked 5 and 10pF caps at C34, 33pF at C10. They have single-ended input through WBT Nextgen silver RCA's and a switch to also provide balanced input through Jac's custom conversion boards built with OPA627's. Binding posts are Vampire copper base. They sound really good, but it's hard to tell how good with the way my rig is currently configured. I am trying to schedule an audition on my friend's Eggleston's to run them full range, and I will report the results. In the meantime, just letting them play at low volume to achieve some break-in.
They are not in metal enclosures, but mounted to wood boards. Absolutely silent. DC offset of both is 1mv with open input. Can that be right?
One funny bit: while powering up the first amp for the first time, no LED lit and no relay click. I checked all the wiring, measured the power supply all the way back to the IEC inlet and got nothing, zero. Well, okay, the power cord must be bad. Smelled burning and thought I must have fried something pretty bad. Despondent, I went to unplug at the wall and saw that I had plugged in my soldering iron instead of the power cord! Check everything.
Peace,
Tom E
They are not in metal enclosures, but mounted to wood boards. Absolutely silent. DC offset of both is 1mv with open input. Can that be right?
One funny bit: while powering up the first amp for the first time, no LED lit and no relay click. I checked all the wiring, measured the power supply all the way back to the IEC inlet and got nothing, zero. Well, okay, the power cord must be bad. Smelled burning and thought I must have fried something pretty bad. Despondent, I went to unplug at the wall and saw that I had plugged in my soldering iron instead of the power cord! Check everything.
Peace,
Tom E
Tom, thanks for the update. I haven't got around to trying the 33/15 pF compensation yet, but I'm staying tuned to your experiments.
😀 LOL 😀
I think the official phrase is "Oh! I guess it would sound better if I plugged it in." If I had a dollar for each time......
That build sounds absolutely top shelf. What are the specs on your transformer(s)? I'm still looking for a good deal on some R-Cores but the shipping charges usually equal or surpass the price of the large units.
I think the official phrase is "Oh! I guess it would sound better if I plugged it in." If I had a dollar for each time......
That build sounds absolutely top shelf. What are the specs on your transformer(s)? I'm still looking for a good deal on some R-Cores but the shipping charges usually equal or surpass the price of the large units.
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Hi All
I just thought that I’d pop in to say how happy i still am with the MYREF FE amp. It just sounds superb and still surprises my with its capabilities.
Sweet, musical and dynamic with great imaging and real slam down below. Partnered to my PMC FB1+ it’s a killer combination.
BTW I’ve found a new best friend pre amp wise.
http://www.diyaudio.com/forums/analog-line-level/220792-muses-72320-electronic-volume-25.html
An awesome combination.
Thanks again to all and especially Dario for making this amp possible.
I just thought that I’d pop in to say how happy i still am with the MYREF FE amp. It just sounds superb and still surprises my with its capabilities.
Sweet, musical and dynamic with great imaging and real slam down below. Partnered to my PMC FB1+ it’s a killer combination.
BTW I’ve found a new best friend pre amp wise.
http://www.diyaudio.com/forums/analog-line-level/220792-muses-72320-electronic-volume-25.html
An awesome combination.
Thanks again to all and especially Dario for making this amp possible.
Hi all,
Did you hear hum when input disconnected in this FE version?
In my rev C, hum was present when input disconnected.
I don't know why.
Did you hear hum when input disconnected in this FE version?
In my rev C, hum was present when input disconnected.
I don't know why.
Hi Shaun, glad to hear your enjoying your FE build, nice one mate
I've had to put my kit building on hold for a bit but hope to get back into it in the near future, besides I'm well sorted for amplification now thanks to yourself and the other good people on here 🙂
Cheers
Davy
One channel starts to produce hum and noise
Hello,
There is an issue with one of the channels of my 6-ch MyRefFE. I hope someone can advise.
It started a few days ago when playing arround with crossover settings in JRiver. There was something wrong with digital signal and all channels played loud digital noise for a few seconds. I stopped and restarted JRiver. Since then, with and without signal one of the 6 channels produces hum and noise, to loud to ignore. Any idea what could be damaged? If I touch the input capacitor or move something in a few mm distance of input capacitor the noise increases. All voltages are ok, and I have checked the solder points. DC output is 4,9 mV. Find attached a picture of PCB.
Is there need to replace LM3886 or LM318?
Thanks
Hello,
There is an issue with one of the channels of my 6-ch MyRefFE. I hope someone can advise.
It started a few days ago when playing arround with crossover settings in JRiver. There was something wrong with digital signal and all channels played loud digital noise for a few seconds. I stopped and restarted JRiver. Since then, with and without signal one of the 6 channels produces hum and noise, to loud to ignore. Any idea what could be damaged? If I touch the input capacitor or move something in a few mm distance of input capacitor the noise increases. All voltages are ok, and I have checked the solder points. DC output is 4,9 mV. Find attached a picture of PCB.
Is there need to replace LM3886 or LM318?
Thanks
