The Great transformer based SE amp

PMA · 10th October 2004, 03:12 PM

Few years ago I made the amp that can be seen in the attached file. Some visitors who were used to listen to the plastic audio were satisfied with its sound. Any comments, folks?

analog_sa · 10th October 2004, 03:31 PM

Czech humour?

PMA · 10th October 2004, 03:36 PM

Seems it greatly depends who is a thread starter. Sometimes evaluated as "minimalistic simple ZEN concept", sometimes as a Czech (black) humour. Go on, please

.

destroyer X · 10th October 2004, 03:42 PM

This BU208, i remember,.... some hi voltage to TV fly Back transistor, to Black and White old television.... good Pavel.!...i like to put this to work in my club.... same volume with a 400 watts Marantz.....of course Marantz at minimum power.... operating class A because of bias... and sounds good!... sometimes we feel confusion.... not perfect because transformers, not all, normally turns the sound a little worst.

regards,

Carlos

PMA · 10th October 2004, 03:48 PM

Hi Carlos - yes, you are absolutely right. The HV TV transistor. Not easy to withstand rectified mains voltage. No power transformer was needed, only one must be a bit careful not to reverse the L and N conductors.

Upupa Epops · 10th October 2004, 03:54 PM

Maybe is better use there only one transistor, best will be IRF 730 with splendid high input capacity, which make wonderful satin smooth sound

.

PMA · 10th October 2004, 03:59 PM

Quote:

Originally posted by Upupa Epops
Maybe is better use there only one transistor, best will be IRF 730 with splendid high input capacity, which make wonderful satin smooth sound .

You are completely right, simple = better. Unfortunately that time when I designed the amp I was not that experienced to be able to develop it with the IRF730. Maybe you could have given me a helping hand.

mefistofelez · 10th October 2004, 05:34 PM

PMA wrote:

Quote:

You are completely right, simple = better.

Et tu, Brutus?

M

10th October 2004, 03:42 PM	#4
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Congratulation Pavel, those simple things usually sounds good! This BU208, i remember,.... some hi voltage to TV fly Back transistor, to Black and White old television.... good Pavel.!...i like to put this to work in my club.... same volume with a 400 watts Marantz.....of course Marantz at minimum power.... operating class A because of bias... and sounds good!... sometimes we feel confusion.... not perfect because transformers, not all, normally turns the sound a little worst. regards, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!

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10th October 2004, 03:31 PM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Czech humour?

10th October 2004, 03:36 PM	#3
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Seems it greatly depends who is a thread starter. Sometimes evaluated as "minimalistic simple ZEN concept", sometimes as a Czech (black) humour. Go on, please .

10th October 2004, 03:48 PM	#5
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Hi Carlos - yes, you are absolutely right. The HV TV transistor. Not easy to withstand rectified mains voltage. No power transformer was needed, only one must be a bit careful not to reverse the L and N conductors.

10th October 2004, 03:54 PM	#6
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Maybe is better use there only one transistor, best will be IRF 730 with splendid high input capacity, which make wonderful satin smooth sound .

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