/OT
I agree. Of course, this is an international forum with members from various regions of the world. As such we will encounter folks whose customs are different from our own from time to time. In any event I will alway try to be respectful the best way I know how and if that turns out to be offensive to one from another culture, then I will try to make it right and remember that in the future. Any how, I return the thread to the discussion of the SYMEF.
/OT
I currently have the amplifier Symef of Pinnocchio.
I agree with jkuetemann, about the sound of Symef.
The bass were a little too powerful, and the lack of high fluidity.
The great qualities of Symef are excellent definition in the register of medium-low. Also the soundstage is very good. As high a little more present and fluid, it would balance the tonal balance.
I do not think he lacks a lot to be perfectly musical.
denbret
I agree with jkuetemann, about the sound of Symef.
The bass were a little too powerful, and the lack of high fluidity.
The great qualities of Symef are excellent definition in the register of medium-low. Also the soundstage is very good. As high a little more present and fluid, it would balance the tonal balance.
I do not think he lacks a lot to be perfectly musical.
denbret
hi harrisson,
These are speakers that I designed, Tubasson Mark 2, 3 channels with low hp (2) and medium SBAcoustic tweeter and Scan-speak Revelator 6620. I took two years to fine tune.
As I wrote above, the high frequencies are a little dry and would be more musical, if it was a little fluid.
I listen to different styles of music, Symef has a very detailed sound in the medium, at this level, it is a reference.
With a little less extreme low current and more fluidity in the high, the amplifier is in my favorites.
denbret
These are speakers that I designed, Tubasson Mark 2, 3 channels with low hp (2) and medium SBAcoustic tweeter and Scan-speak Revelator 6620. I took two years to fine tune.
As I wrote above, the high frequencies are a little dry and would be more musical, if it was a little fluid.
I listen to different styles of music, Symef has a very detailed sound in the medium, at this level, it is a reference.
With a little less extreme low current and more fluidity in the high, the amplifier is in my favorites.
denbret
Just getting around to starting my version one board. I plan to use the same power supply board form the mini Aleph the comes from chipamp. Would this be a suitable transformer for this application?
Large Powerful Step Down Transformer 120VAC 17V 18V 20V 25V 40V 65V 90V 500VA | eBay
I has a lot of outputs and I would lie to set it up to use different ones for different amps as a test bed power supply.
Large Powerful Step Down Transformer 120VAC 17V 18V 20V 25V 40V 65V 90V 500VA | eBay
I has a lot of outputs and I would lie to set it up to use different ones for different amps as a test bed power supply.
Hi Denbret,
I like the attention and love you have for those wonderful speakers. Is it possible that room acoustics are coming into play. Is the listening room a cube ? During the fine tuning of the speakers what instrumentation did you use ? I do not doubt that the SYMEF has some serious bass.
Thank you for your feed back and taking the time to listen and to also put it on your favorite list.
As progress is made you can expect that the feedback will be analyzed for some interesting finds or improvements.
kind regards,
Harrison.
I like the attention and love you have for those wonderful speakers. Is it possible that room acoustics are coming into play. Is the listening room a cube ? During the fine tuning of the speakers what instrumentation did you use ? I do not doubt that the SYMEF has some serious bass.
For the high frequencies do you feel like it leaves you thirsty asking for more, like not getting enough ?
Thank you for your feed back and taking the time to listen and to also put it on your favorite list.
As progress is made you can expect that the feedback will be analyzed for some interesting finds or improvements.
kind regards,
Harrison.
Hi c12mech
Long time.
Had a look at it but the windings may not quite make it. But could be useful as a test supply not a production supply.
Looking forward to your build.
kind regards,
Harrison.
Long time.
Had a look at it but the windings may not quite make it. But could be useful as a test supply not a production supply.Looking forward to your build.
kind regards,
Harrison.
+/-40 is safe, +/-50 is ok. +/-60 your on your own.
You can use a 28-0-28, 30-0-30,32-0-32. For single channel 300VA. So two for stereo. Or a single 500VA/600VA for stereo.
However these series has been depleted by members here
http://www.antekinc.com/details.php?p=100
Antek - AN-5228
Antek - AN-6228
Antek - AN-5232
You could try these
http://www.amazon.com/Avel-Y236851-...&qid=1377152575&sr=8-3&keywords=avel+lindberg
http://www.amazon.com/Avel-Y236751-...qid=1377152635&sr=8-20&keywords=avel+lindberg
http://www.amazon.com/Avel-Y236653-...qid=1377152635&sr=8-25&keywords=avel+lindberg
kind regards,
Harrison.
You can use a 28-0-28, 30-0-30,32-0-32. For single channel 300VA. So two for stereo. Or a single 500VA/600VA for stereo.
However these series has been depleted by members here
http://www.antekinc.com/details.php?p=100
Antek - AN-5228
Antek - AN-6228
Antek - AN-5232
You could try these
http://www.amazon.com/Avel-Y236851-...&qid=1377152575&sr=8-3&keywords=avel+lindberg
http://www.amazon.com/Avel-Y236751-...qid=1377152635&sr=8-20&keywords=avel+lindberg
http://www.amazon.com/Avel-Y236653-...qid=1377152635&sr=8-25&keywords=avel+lindberg
kind regards,
Harrison.
Last edited:
There is also these
http://s108396045.oneandoneshop.com/action/order.php4?a=732.302
http://s108396045.oneandoneshop.com/action/order.php4?a=767.302
and these
300VA Power Transformer
300VA Power Transformer
300VA Power Transformer
500VA Power Transformer
500VA Power Transformer
500VA Power Transformer
625VA Power Transformer
625VA Power Transformer
625VA Power Transformer
Enjoy.
http://s108396045.oneandoneshop.com/action/order.php4?a=732.302
http://s108396045.oneandoneshop.com/action/order.php4?a=767.302
and these
300VA Power Transformer
300VA Power Transformer
300VA Power Transformer
500VA Power Transformer
500VA Power Transformer
500VA Power Transformer
625VA Power Transformer
625VA Power Transformer
625VA Power Transformer
Enjoy.
Thank you Meanman1964
For type 1 an average of 23mV across R13,R14,R24,R25
For type 2 an average of 23mV across R12,R13,R20,R21
Use 10A regular fuses or 3-5A slow blow
kind regards,
Harrison.
For type 1 an average of 23mV across R13,R14,R24,R25
For type 2 an average of 23mV across R12,R13,R20,R21
Use 10A regular fuses or 3-5A slow blow
kind regards,
Harrison.
Expires 10 Dec 2013
There are still three pairs left of 2oz 1DIFFQC PCBS for the next three members to post their reviews of their complete SYMEF type2 boards.
kind regards,
Harrison.
Hello Onaudio,
After look at your design let me tell you few words.
Have you experienced valve audio electronic? Your solution makes me think you try to achieve transmission curve of a triode. If so, well done! It is good idea by low current and diodes. It is rare solid state that can produce that kind of sound.
Regards
You have indeed spent time with this amplifier. The entire amplifier is modelled as a single compound device whose transfer curve is optimised. Also incorporated is a graceful failure mode. As a result many have made the following observations
1. It sounds as if it does not clip
2. It sounds more powerful than amplifiers on higher rails
3. Sounds better than a tube amplifier
4. Makes musicians sound live in room
5. Powerful bass
Among many others
I am also still investigating this amplifier. It is proving to be quite something.
I am hoping to gather as many reviews as possible from all the amplifiers currently published by HAL and use this to better understand these amplifiers and update the models that they approximate.
kind regards,
Harrison.
1. It sounds as if it does not clip
2. It sounds more powerful than amplifiers on higher rails
3. Sounds better than a tube amplifier
4. Makes musicians sound live in room
5. Powerful bass
Among many others
I am also still investigating this amplifier. It is proving to be quite something.
I am hoping to gather as many reviews as possible from all the amplifiers currently published by HAL and use this to better understand these amplifiers and update the models that they approximate.
kind regards,
Harrison.
Slew Rate of SYMEF
OK, I know I initially brought this up in my initial evaluations but I recently cycled my SYMEF into to listening room. Some of my initial impressions rushed back, reinforced by additional comments of my company that day. The really soft, rounded treble is what I have always wondered about. I decided to take some accurate measurements. I don't mind some subjectivism, after all that is the experience, but some objectivism is good too.
Attached is the scope shot. The amplifier was powered by +/-31V and operating into an 8 ohm resistive load. It is an image showing 10Vp-p square wave out at 100Hz where I am focussed on the leading edge. The cursors are set to 10%/90% for a voltage rise of 8V, the time cursors show a 22.4us rise time. The math says we have a 0.36V/us slew rate. An LM741C can do better!
My question is, has anyone else taken direct objective measurements of this amp? I was quite surprised by this result and am quite frankly looking to see if my build is unique (that is did I make an error killing the performance - both modules mind you) or common experience in this regard.
I can say there was some oscillation in the initial build and had to go from shunt compensation as Harrison specified to Miller compensation. There seemed to be no difference in speed, just a low oscillation riding on top of the signal prior to altering the compensation. Comments?
OK, I know I initially brought this up in my initial evaluations but I recently cycled my SYMEF into to listening room. Some of my initial impressions rushed back, reinforced by additional comments of my company that day. The really soft, rounded treble is what I have always wondered about. I decided to take some accurate measurements. I don't mind some subjectivism, after all that is the experience, but some objectivism is good too.
Attached is the scope shot. The amplifier was powered by +/-31V and operating into an 8 ohm resistive load. It is an image showing 10Vp-p square wave out at 100Hz where I am focussed on the leading edge. The cursors are set to 10%/90% for a voltage rise of 8V, the time cursors show a 22.4us rise time. The math says we have a 0.36V/us slew rate. An LM741C can do better!
My question is, has anyone else taken direct objective measurements of this amp? I was quite surprised by this result and am quite frankly looking to see if my build is unique (that is did I make an error killing the performance - both modules mind you) or common experience in this regard.
I can say there was some oscillation in the initial build and had to go from shunt compensation as Harrison specified to Miller compensation. There seemed to be no difference in speed, just a low oscillation riding on top of the signal prior to altering the compensation. Comments?
