Could have soldered the connectors onto the bottom of the board instead of the top to make access easier. Also it would be quicker to have a sheet of paper and to write down the value of the components as you measure them. Then place the components next to the measurements. That way you would only have to measure hem once.
yes you are totally right. soon as I get a paper and a pen my little boy took them from me and with the connectors yes is a good idea as well. I have few more preamplifiers kits to build and test and I will chose the best one for a final project! Thanks for your comment!
@@petercornell2002 www.ebay.co.uk/itm/322821956499?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=biMeahOQQKW&sssrc=4429486&ssuid=e2bvqqopq7c&var=&widget_ver=artemis&media=COPY a link for this
@@plexon2006 www.ebay.co.uk/itm/322821956499?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=biMeahOQQKW&sssrc=4429486&ssuid=e2bvqqopq7c&var=&widget_ver=artemis&media=COPY should be this link
@@memyshelfandeye318 it's just a pre-amp and is class A so one transistor drive all full sine wave so no need thermally coupled. When 2 transistors drive the full sine wave yes you will need it but not on a preamplifier.
If you click on the listing link of this kit you will find the schematic on description and then you will definitely understand that is one transistor which drive the signal. about the capacitors if will perform well when I will run some tests easy I can get some high quality capacitors and change them. regarding the power supply how you can see also on the video I didn't populate it because I know is always better the power supply to be separate from the preamplifier board.
@@petercornell2002but the measurements aren’t consistent, at a one moment a resistor measures 100.4 ohm and the same resistor measures 100.1 the next measurement. And I believe I have seen there was a resistor that was below 99 ohm. But I’m pretty sure that when you warm up these resistors between your fingers the difference wil be even bigger. I do however think that this kind of component matching doesn’t make much of a difference. For example calculate with an output difference of 1% in a power amplifier. 10 volts into 8 ohms gives you 12.5 watts, 10.1 volts into 8 ohms gives you a difference of 0.75 watts and that is 0.25dB. That isn’t noticeable for most (any?) humans. I would worry more about the difference in potentiometers. I have seen original ALPS RK series pots with tolerances between both sides more than 5%. The Chinese ALPS pots found on eBay / Ali Exp have way higher differences.
@@RTBNL these differences may be from the multimeter that was on auto mode on next video when I will use it I will switch on manual mode and we can definitely understand what is. The resistors or the multimeter on auto mode
@@SymbolTech21 the automatic range switching should not be of any influence for the results as long as it ends in the same range. If you have some resistors left you can try heating them up a little. Many of these metal film resistor might originate from china and they are prone to be very sensitive to temperature changes. Don’t torch them but just hold a hot solder tip a few millimeters beside them. You might be amazed how much drift there is.
Could have soldered the connectors onto the bottom of the board instead of the top to make access easier.
Also it would be quicker to have a sheet of paper and to write down the value of the components as you measure them. Then place the components next to the measurements. That way you would only have to measure hem once.
yes you are totally right. soon as I get a paper and a pen my little boy took them from me and with the connectors yes is a good idea as well. I have few more preamplifiers kits to build and test and I will chose the best one for a final project! Thanks for your comment!
Hey Toni, nice vid, thanks. Where did you get the resister bender pliers from? They look great!
I see, from Ebay. Do you have a lik, if possible? Thx
@@petercornell2002 yes from eBay
@@petercornell2002 www.ebay.co.uk/itm/322821956499?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=biMeahOQQKW&sssrc=4429486&ssuid=e2bvqqopq7c&var=&widget_ver=artemis&media=COPY a link for this
Cool technique in bending the wires. Can you please tell us where you got your wire bending pliers?
@@plexon2006 www.ebay.co.uk/itm/322821956499?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=biMeahOQQKW&sssrc=4429486&ssuid=e2bvqqopq7c&var=&widget_ver=artemis&media=COPY should be this link
looks like one of those complicated ones. does it sound really good ?
@@iceberg789 I tested and already filmed, soon I will have the video on UA-cam. Just a little editing put together the clips
Not audiophile: Power on-board, electrolytic capacitors in the signal path, transistors not thermally coupled.
@@memyshelfandeye318 it's just a pre-amp and is class A so one transistor drive all full sine wave so no need thermally coupled. When 2 transistors drive the full sine wave yes you will need it but not on a preamplifier.
If you click on the listing link of this kit you will find the schematic on description and then you will definitely understand that is one transistor which drive the signal. about the capacitors if will perform well when I will run some tests easy I can get some high quality capacitors and change them. regarding the power supply how you can see also on the video I didn't populate it because I know is always better the power supply to be separate from the preamplifier board.
Sorry but it looks like when you are measuring the 100k resistors your resistance measurements are not very consistent.
They are all within 1%
@@petercornell2002but the measurements aren’t consistent, at a one moment a resistor measures 100.4 ohm and the same resistor measures 100.1 the next measurement.
And I believe I have seen there was a resistor that was below 99 ohm.
But I’m pretty sure that when you warm up these resistors between your fingers the difference wil be even bigger.
I do however think that this kind of component matching doesn’t make much of a difference. For example calculate with an output difference of 1% in a power amplifier. 10 volts into 8 ohms gives you 12.5 watts, 10.1 volts into 8 ohms gives you a difference of 0.75 watts and that is 0.25dB. That isn’t noticeable for most (any?) humans.
I would worry more about the difference in potentiometers. I have seen original ALPS RK series pots with tolerances between both sides more than 5%. The Chinese ALPS pots found on eBay / Ali Exp have way higher differences.
@@RTBNL these differences may be from the multimeter that was on auto mode on next video when I will use it I will switch on manual mode and we can definitely understand what is. The resistors or the multimeter on auto mode
@@RTBNL I believe is the multimeter on auto mode
@@SymbolTech21 the automatic range switching should not be of any influence for the results as long as it ends in the same range.
If you have some resistors left you can try heating them up a little. Many of these metal film resistor might originate from china and they are prone to be very sensitive to temperature changes. Don’t torch them but just hold a hot solder tip a few millimeters beside them. You might be amazed how much drift there is.