That’s a cool setup there, plenty of parts to choose from!
I would try and get the hfe with in 2 milivolts or less if you can even, but like anatech mentioned, the source resistors will have a tolerance of their own that will take over.
So you will need to find some 1% resistors also to continue the precision trend.
I would try and get the hfe with in 2 milivolts or less if you can even, but like anatech mentioned, the source resistors will have a tolerance of their own that will take over.
So you will need to find some 1% resistors also to continue the precision trend.
Thanks . So I need match resistors R646, R645 on board equal like 1%. What about transistors T645 T646 need match too ?
I order basket 1% resistors 3 days ego 🙂
I order basket 1% resistors 3 days ego 🙂
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That's a singleton amplifier. Yuk.
You don't have to match anything at all. If you have the time, look up the Symasym amplifier developed on this forum. Look at the differences between that one and the one you plan to build. That explains why things didn't make sense to you.
-Chris
You don't have to match anything at all. If you have the time, look up the Symasym amplifier developed on this forum. Look at the differences between that one and the one you plan to build. That explains why things didn't make sense to you.
-Chris
Thanks Chris . I look schematic Symasym amplifier , very interesting , for me with low level understanding I see no feedback on schematic , parallel double output transistors . This is all what I get .
One time on old preamp EQ Soundcraftmen I split two preamps channels to mono , one channel start sound two time better , less compress , more open , reach sound . It's possible schematic Symasym amplifier doing the same with Doubling transistors can make the same rich and perfect sound .
I measured the output transistors on the second set of Braun amplifiers ; they turned out to be perfectly matched. I just have bad one transistor on LF amp .
I got from Ebay 3600, 130 values Metal Film Resistor for $7 Not bad . I tried to measure ,all around 1% and less , and then I try heated with a lighter 51Kohm become 48.8 Kohm but temperature was , very very hot . I'm waiting a lot of capacitors from Mouser and I ready to go experiments , rebuild and improving Braun LV 1020 .
Can I use a generator from a computer through a sound card to use an oscilloscope ???
One time on old preamp EQ Soundcraftmen I split two preamps channels to mono , one channel start sound two time better , less compress , more open , reach sound . It's possible schematic Symasym amplifier doing the same with Doubling transistors can make the same rich and perfect sound .
I measured the output transistors on the second set of Braun amplifiers ; they turned out to be perfectly matched. I just have bad one transistor on LF amp .
I got from Ebay 3600, 130 values Metal Film Resistor for $7 Not bad . I tried to measure ,all around 1% and less , and then I try heated with a lighter 51Kohm become 48.8 Kohm but temperature was , very very hot . I'm waiting a lot of capacitors from Mouser and I ready to go experiments , rebuild and improving Braun LV 1020 .
Can I use a generator from a computer through a sound card to use an oscilloscope ???
Hi Pashka,
Your sound card can only take 5 Vp-p, or about 3 1/2 Vrms. It's risky measuring an amplifier straight in like that. If you had a THD meter, you could connect the monitor out to your sound card and look at the spectrum of the distortion..
-Chris
Your sound card can only take 5 Vp-p, or about 3 1/2 Vrms. It's risky measuring an amplifier straight in like that. If you had a THD meter, you could connect the monitor out to your sound card and look at the spectrum of the distortion..
-Chris
Thanks Chris.
maybe I did not explain it right. I meant to use the computer and the external sound card as a signal generator for the amplifier, I will look at the THD on an oscillograph.
Or better get any simple generator from ebay ?
maybe I did not explain it right. I meant to use the computer and the external sound card as a signal generator for the amplifier, I will look at the THD on an oscillograph.
Or better get any simple generator from ebay ?
Hi Pashka,
You would be fine using a sound card to generate test tones. That is a good plan.
-Chris
You would be fine using a sound card to generate test tones. That is a good plan.
-Chris
Thanks Chris . I found this circuit. Honestly, I do not understand anything in schematics. What I saw is the double output of the transistors in a pair and there seems to be no feedback. How to apply it to my amp to improve I have no idea. only desires.
Ok. I try send square Wave signal from Mac thru sound card Apogee Duet to Oscilloscope .Is it normal looking or this is real bad one what show pictures ? Maybe need real generator something like Chinese from ebay ?
Thanks .
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Hi Pashka,
No, that looks good. The sound card has filters that ring just like real analogue ones will. Normally you do not send square waves through a sound card. I have seen a lot worse too..
These days when I want a square wave, I use a pulse generator instead of a function generator most of the time. The rising and falling edges are a lot cleaner and you can even set the rise and fall times.
No, that looks good. The sound card has filters that ring just like real analogue ones will. Normally you do not send square waves through a sound card. I have seen a lot worse too..
These days when I want a square wave, I use a pulse generator instead of a function generator most of the time. The rising and falling edges are a lot cleaner and you can even set the rise and fall times.
Elna SilmicII best the signal path, and in low powered supplies like CD players maybe. I have one CD player.
Amplifers, my V9 i went with Panasonic FR, FM, SU and Nichicon PW. Since only one capacitor in the signal path via tone, which I used a CDE 940c, but for the bipolar and to save space, i could have used silmicII twisted to make up the value, over using a Nichicon ES
Amplifers, my V9 i went with Panasonic FR, FM, SU and Nichicon PW. Since only one capacitor in the signal path via tone, which I used a CDE 940c, but for the bipolar and to save space, i could have used silmicII twisted to make up the value, over using a Nichicon ES
Just mixed Silmic II with KZ. There is a suspicion that Silmic too smears a sound, the attack, accents was gone, a certain air realness disappeared. It is impossible to call the condenser good if it changes sounding. High frequencies became hissing, there are no natural sounds. If shortly to characterize a sound from Silmic it is possible to tell safely if earlier I could describe sounding of real instruments, after recap with silmic I can tell only about frequency characteristics .
I can be mistaken.
I can be mistaken.
I am agree as i have millions of both electrolytic and film capacitors.
Silmic sound is nice to me but it changes the sound.
Braun LV1020 tri amp , mix KZ and Silmic II in crossover and amplifier , not in PS .
Also change , recap coupling electrolytic to WIMA MKS 2
It is hard to say to notice precisely as silmic make sound or KZ it is mixed in half with KZ. Right now I will change all silmic to KZ on my MF crossover and the amplifier board , w'll see . Sound more deadly right now , then was before , more compress . If to explain with language of feelings and perceptions, the sound became more compression, today fashion for a dead sound as many company build High End for huge money. I like an impudent live sound that there was a realness, air, feeling of presence.
Don’t say I didn’t tell you where to start with the mods first Pashka. All caps have certain sound while it may work on 1 location it does not mean it will sound good everywhere. KZ are very good sounding caps 50v version sounds best but their set back is highs especially for percussion instruments sound sizzle & un natural. Silmic aren’t my fav there’s a certain softness to the sound.
Thanks sumotan for yours help and knowledge . KZ means it will be necessary to remove from the HF crossover and amplifier . So far I will leave KZ on MF amp and xover What w'll best for LF crossover and the amplifier? KZ look like don-t want go very low , I try push down with EQ , sound not realistic . I like it not compress , open with air realistic sounding instruments with big body , ...
How is Silmic on low end frequency ? Thanks
How is Silmic on low end frequency ? Thanks
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Actually your doing too much at one go Pashka. When I tweak with components I always do only 1 change at a time sit back, listen. Making too many changes at 1 go will cause confusion to yourself & not to mention will upset the sound of your amp or xo. I would recommend that you start at the bridge rectifiers if no go next which are the PS caps. They affect sound far more then you think. From there then move on local decoupling caps. Be it a building, a plant etc, foundation is most important, if you don’t get it right you’ll not get great sound by changing the decoupling caps. All you will get is a change in tonal balance which as you already discovered worse then stock caps.
Sumotan, Yes you right
I recap PS with large cans EPCOS 560 10000uf it was not big improvements .
I start recap amps , then XO on one amplifier , second was untouchable and the same situation , not a lot of changes, same detail . Then I change trimmer resistors ) level between XO I thing from this point started something going on .
NOw a lot of bass , more and more coming is it not bаd , i can control ...
Yes bridge , I try buy but I don't know exactly which one.
I recap PS with large cans EPCOS 560 10000uf it was not big improvements .
I start recap amps , then XO on one amplifier , second was untouchable and the same situation , not a lot of changes, same detail . Then I change trimmer resistors ) level between XO I thing from this point started something going on .
NOw a lot of bass , more and more coming is it not bаd , i can control ...
Yes bridge , I try buy but I don't know exactly which one.
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