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Old 27th December 2018, 03:55 PM   #10851
44250 is offline 44250  Serbia
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Quote:
Originally Posted by sumeshak View Post
Tests completed...?
yes. i made a mistake at MM-MC phono preamplifier,so later i will post corrected files. i have also decreased current of a-class shunt to achive less heating in inclosure by increasing 22r to 47r (for pair of phono) and to 62r (for preamp with tone controle). i have put 22k at input of preaplifier with tone controle and a switch with 18k in parallel with that 22k to achive amlifying ratio of 1 and 2,2. it is not necessary but that is what i wanted.

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File Type: jpg MM MC izgled jpg.JPG (832.6 KB, 755 views)
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File Type: pdf MM MC bakar gledan kroz pločicu sa strane elemenata.pdf (66.5 KB, 64 views)
File Type: pdf MM MC raspored elemenata.pdf (86.7 KB, 59 views)
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Old 27th December 2018, 10:41 PM   #10852
44250 is offline 44250  Serbia
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I have listened MM MC for a few hours now,and my first impressions are really good! I am not to experienced with phono theme, I had one phono preamp before this one. it was IC-based and it had (at my opinion) too much amplifying and it bursted a bit at high frequencies. MM MC does its job much more natural and pretty equally at all frequencies, from bass to treble. i think it should have a bigger amplifying ratio but it is quite enough as it is,all in all. for sure,it is a step further than I was until now.
Preamp with tone controles works also really nice,and whole system is really quiet even with everything on max and with MM MC as a signal source. quite pleasantly surprised!
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Old 30th December 2018, 02:09 AM   #10853
eliasib is offline eliasib  Venezuela
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Hello friends. I want to build the HX-11 class H but I would like to make some changes such as adding a pair of transistors more per rail (total six transistors) to make use of a big transformer that I got from an amplifier. I think one of the changes I have to make is replace the diodes that pass +/-VL. The power supply provides +/-35V, +/-75V. Any suggestion, I would thank you.
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Old 1st January 2019, 08:35 PM   #10854
maxwell007 is offline maxwell007  Czech Republic
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Guys, I still fighting with one channel of my Apex A40.. I am able to set bias,offset, but when i increase voltage over +-9V signal looking very strange... :-) I did some mistake before, mostly solved...any idea?
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Old 5th January 2019, 09:31 PM   #10855
44250 is offline 44250  Serbia
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have you resolved problem? I have had problem with bias stability but oscilloscope had not showed me such problems... i do not know what would be a problem in your case, but it seems it is in "positive" side of power amplifying, I would start by checking that side of an amplifier board. compensations on that side,transistors pinout, value of resistors at their place... i have had problems with different markings of capacitors, so instead of (in my that one case) 330pF I have installed 33pF. manufacturer of capacitors I have had in that moment marks capacitors in a different way than others, and I have bought them as 330pF. naturally, amplifier had "seen" that and it was not glad,so it had oscillated.
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Old 10th January 2019, 08:56 PM   #10856
doityourselfamp is offline doityourselfamp
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hello
i need a hayberide preamp with tube and transistor
the sound must be warm and best quality
any one have sugestion please?
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Old 10th January 2019, 09:21 PM   #10857
smartx21 is offline smartx21  Brazil
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Quote:
Originally Posted by doityourselfamp View Post
hello
i need a hayberide preamp with tube and transistor
the sound must be warm and best quality
any one have sugestion please?
Pls contact @vzaichenko
Virtual Zero Audio Store
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Old 16th January 2019, 04:57 AM   #10858
rankot is offline rankot  Serbia
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Originally Posted by prasi View Post
Hi,
please find attached herewith pdf files and other documents.
Which version of schematic is this? 14, 14.1, 14P or something else?
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Old 16th January 2019, 05:03 AM   #10859
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by maxwell007 View Post
Guys, I still fighting with one channel of my Apex A40.. I am able to set bias,offset, but when i increase voltage over +-9V signal looking very strange... :-) I did some mistake before, mostly solved...any idea?
Amplifier is unstable and breaking into oscillation.
Increase C9/10.
R21/22 can affect oscillation too, I usually use 10R in those positions.
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