ok, I see so many answers about using tube for a input stage...
hm... and so - the parts for combination doz-pre + power follower are already buy from me... and from my experience with DoZ amp (look at the link below) i think that i really want to know what kind of sound will be consequence of doz-pre + Power Follower making ...
Today i will go to shop and buy some 1uf , maybe 2uf MKP's (i hope that they will be find in the shop) or even some MKT or MKS4 ... and i will start making PCB's proposed from Pavel ...
REM: I am 29 years old and electronics for me is nothing but a hobby, and way for having good sounding audio without throwing extra money on market
For tube sound - I have experience with Tube buffer + Gainclone (LM3875) output stage, but there will be problem with DC offset ... etc.... and someone was saying that tube has specific sound . I'm agree with that and using tube gets to high distortion, but different sound... well see...
maybe for beginning i will make "standart" configuration and then i will experiment with tubes
Best Reggars!
Niki / BG
hm... and so - the parts for combination doz-pre + power follower are already buy from me... and from my experience with DoZ amp (look at the link below) i think that i really want to know what kind of sound will be consequence of doz-pre + Power Follower making ...
Today i will go to shop and buy some 1uf , maybe 2uf MKP's (i hope that they will be find in the shop) or even some MKT or MKS4 ... and i will start making PCB's proposed from Pavel ...
REM: I am 29 years old and electronics for me is nothing but a hobby, and way for having good sounding audio without throwing extra money on market
For tube sound - I have experience with Tube buffer + Gainclone (LM3875) output stage, but there will be problem with DC offset ... etc.... and someone was saying that tube has specific sound . I'm agree with that and using tube gets to high distortion, but different sound... well see...
maybe for beginning i will make "standart" configuration and then i will experiment with tubes
Best Reggars!
Niki / BG
panic!
Helli again, i've already made PCB's BUT,
i have some questions about things that i don't understand:
On the components layout sheme i see one R9 that dont exist on this sheme What value have R9?! D1 and D2 are too unknown for me?
What values are they? And also i see marked points on PCB and don't know what their proposal is? I mean point between C6-plus and R7 , and other: between two collectors of Q2 & Q3?
Thank You!
Reggards!
Niki
BG
Helli again, i've already made PCB's
BUT,i have some questions about things that i don't understand:
On the components layout sheme i see one R9 that dont exist on this sheme What value have R9?! D1 and D2 are too unknown for me?
What values are they? And also i see marked points on PCB and don't know what their proposal is? I mean point between C6-plus and R7 , and other: between two collectors of Q2 & Q3?
Thank You!
Reggards!
Niki
BG
D1 and D2 are 1N4148
If my memory serves well R9 is straight wire
Make sure your heatsinks are capable
http://www.petemoore.pwp.blueyonder.co.uk/GC Pics/m2.jpg
http://www.petemoore.pwp.blueyonder.co.uk/GC Pics/m.jpg
If my memory serves well R9 is straight wire
Make sure your heatsinks are capable
http://www.petemoore.pwp.blueyonder.co.uk/GC Pics/m2.jpg
http://www.petemoore.pwp.blueyonder.co.uk/GC Pics/m.jpg
Hei PeteM
Big beast you have there
Thank You for info about diodes... I'm already see at original article from soundwesthost...
but for R9 i put 51ohm resistor, and after this for R101 i use 270ohm original resistor
I have already big heatsinks
Four monsters like in my DoZ (link below)
Best reggards!
Big beast you have there
Thank You for info about diodes... I'm already see at original article from soundwesthost...
but for R9 i put 51ohm resistor, and after this for R101 i use 270ohm original resistor
I have already big heatsinks
Four monsters like in my DoZ (link below)
Best reggards!
Yeeep!
Yeeep!
Power Follower is ready! For moment i listen them only with my Plextor Premium USB writer line-out, because my optical lens of my CD player is broke down...
Great sound ! Less THD than DoZ and more high freq smothness.
I have to tune sinusuidal "ballance" with my faithful osciloscope Philips 2x 80Mhz
Yeeep!
Power Follower is ready! For moment i listen them only with my Plextor Premium USB writer line-out, because my optical lens of my CD player is broke down...
Great sound ! Less THD than DoZ and more high freq smothness.
I have to tune sinusuidal "ballance" with my faithful osciloscope Philips 2x 80Mhz
Thank you
Great job you've done with this Power Follower, Peter
After listening tests i have to say what is my impression.
First of all this is the most correct amplifier i've listen with the best high frequences of all... There is no hum or ringing... btw, my heatsinks are not enough for this monster. Working temperature was around 100.C but when i use auxiliary heatsink, temperature fall to 85-90.C
But i have some observation - i hear little lack of low freq and little distortion at lowest diapason. What tweak You recommend?
My power supply is 30V AC transformer, after is big Siemens Capacitor - 33000uF (1976 year made, but perform great menage)
My DC is around 36VDC. My 1uf and 2uf capacitors are MKT (instead of MKP, for example). IRFP340 and TIP142 are original and i think they are ok. Instead of R- 1ohm/5W, i use four 1ohm/5W in this sheme:
---###--- + ---###---
---###--- + ---###---
and after this my procedure i get 1ohm/20W
What are importand capacitors for sound? And what kind or manufacturer do you propose for replacing them?
Is worth it if i use some fast shotky diodes in rectifier bridge, like example my favourite BYV or BYW series from Philips?
Best reggards!
Niki
Great job you've done with this Power Follower, Peter
After listening tests i have to say what is my impression.
First of all this is the most correct amplifier i've listen with the best high frequences of all... There is no hum or ringing... btw, my heatsinks are not enough for this monster. Working temperature was around 100.C but when i use auxiliary heatsink, temperature fall to 85-90.C
But i have some observation - i hear little lack of low freq and little distortion at lowest diapason. What tweak You recommend?
My power supply is 30V AC transformer, after is big Siemens Capacitor - 33000uF (1976 year made, but perform great menage)
My DC is around 36VDC. My 1uf and 2uf capacitors are MKT (instead of MKP, for example). IRFP340 and TIP142 are original and i think they are ok. Instead of R- 1ohm/5W, i use four 1ohm/5W in this sheme:
---###--- + ---###---
---###--- + ---###---
and after this my procedure i get 1ohm/20W
What are importand capacitors for sound? And what kind or manufacturer do you propose for replacing them?
Is worth it if i use some fast shotky diodes in rectifier bridge, like example my favourite BYV or BYW series from Philips?
Best reggards!
Niki
mod news
Hello, i made changes to amplifier parts:
C101+C102 = 2uF MKP x1
C1+C2 = 2uF MKP x1
C5 - 100uF RU Silver Tantal
C6 - 2000uF /50V [M]
C4, C103 - 47uF /25V ELNA
C104 - 10000uF /35V Nipon Chemical
For amplifying Gain of DoZ i replace R4 from 4K3 to 3K3 and replace C3 from 27uF to 33uF.
With this changes sound get better and no distortion in low freq.
I've try replacing C106 with Wima MKP 1uF but sound gets worse in middle freqs. and after this i put for C106 1uF MKT - strange but this is the best choice for now.
Interesting that voltage across D101 is 4.4V
Hello, i made changes to amplifier parts:
C101+C102 = 2uF MKP x1
C1+C2 = 2uF MKP x1
C5 - 100uF RU Silver Tantal
C6 - 2000uF /50V [M]
C4, C103 - 47uF /25V ELNA
C104 - 10000uF /35V Nipon Chemical
For amplifying Gain of DoZ i replace R4 from 4K3 to 3K3 and replace C3 from 27uF to 33uF.
With this changes sound get better and no distortion in low freq.
I've try replacing C106 with Wima MKP 1uF but sound gets worse in middle freqs. and after this i put for C106 1uF MKT - strange but this is the best choice for now.
Interesting that voltage across D101 is 4.4V
ok
Thank you for your note Pavel, but i've searching and searching and so... and i can't find anywhere the same type of zener
Transistors, transformer, bridge and resistors at 1ohm are run pretty hot... huh ... And even with help of my secondary heatsinks temperature of transistors run at approx 100.C ....but in other side sound is wonderful... wow what a sound from 2 piece of transistors
"Direct" album from Vangelis, Jan Garbarek's - "In Praise of Dreams" or "Love Over Gold" from Dire Straits I never listen them so pure and clean like with Your amp!!!
I'll try increasing resistors to 1.5ohm like you propose. 10x
Best reggards!
Niki
Thank you for your note Pavel, but i've searching and searching and so... and i can't find anywhere the same type of zener
Transistors, transformer, bridge and resistors at 1ohm are run pretty hot... huh ... And even with help of my secondary heatsinks temperature of transistors run at approx 100.C ....but in other side sound is wonderful... wow what a sound from 2 piece of transistors
"Direct" album from Vangelis, Jan Garbarek's - "In Praise of Dreams" or "Love Over Gold" from Dire Straits I never listen them so pure and clean like with Your amp!!!I'll try increasing resistors to 1.5ohm like you propose. 10x
Best reggards!
Niki
Niki,
at the bottom end of follower web page
http://www.pha.inecnet.cz/macura/follower_e.html
there is a formula that shows how quiescent current varies with R6 value. So you can play with R6 (originally 1 Ohm) to change Iq. Increase of R6 will decrease Iq, but also power will be lower.
I agree, the Follower sounds best when connected directly to the CD output, without any interstage. The case is volume, depends on speaker sensitivity.
at the bottom end of follower web page
http://www.pha.inecnet.cz/macura/follower_e.html
there is a formula that shows how quiescent current varies with R6 value. So you can play with R6 (originally 1 Ohm) to change Iq. Increase of R6 will decrease Iq, but also power will be lower.
I agree, the Follower sounds best when connected directly to the CD output, without any interstage. The case is volume, depends on speaker sensitivity.
Hello,
i've try so many combination of changing parts of amplifier... i've try placing 10000uF etc... lowering Iq etc... but bass is not enough for me.. for example DoZ have more bass from power follower... and i hear some "ssshhh" frequences from aroun 5-8Khz...
what i have to replace or change for more low freq?!
Reggards!
i've try so many combination of changing parts of amplifier... i've try placing 10000uF etc... lowering Iq etc... but bass is not enough for me.. for example DoZ have more bass from power follower... and i hear some "ssshhh" frequences from aroun 5-8Khz...
what i have to replace or change for more low freq?!
Reggards!
MikeB, these resistors in series will "damage" sound?!
When i was experimenting with DoZ i was so confused from enormous differences between trasnistors...
and maybe here , with power follower the situation will be the same, thats because i was asking about some parts replace, maybe different transistors? i really dont know...
and some news: I've try changing entrance of DoZpreamp+Power Follower, i mean that signal from CDplayer i put it between R101 and C101-C102.
DoZ-preamp + Power Follwer
The result was ofcourse - low level output and little clear and smooth sound, but especialy with lowest freq - the situatuion was the same...
When i was experimenting with DoZ i was so confused from enormous differences between trasnistors...
and maybe here , with power follower the situation will be the same, thats because i was asking about some parts replace, maybe different transistors? i really dont know...
and some news: I've try changing entrance of DoZpreamp+Power Follower, i mean that signal from CDplayer i put it between R101 and C101-C102.
DoZ-preamp + Power Follwer
The result was ofcourse - low level output and little clear and smooth sound, but especialy with lowest freq - the situatuion was the same...
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