Hello all DIY folks, ladies and gentlemen 
This is my first post here, at last. I have been lurkin here for ages. Thats not normal for me.
I am often a contributor and have no problem with the verbal or writing in several different forums around the world. I am a big hobby enthusiast in electronics, but also genealogy and old American musclecars, among some other things.
My desire for a power amplifier which I have built myself have come up to my mind lately. I have gathered components through the years but after some extensive reading at this forum, old and new threads, several hours a day the last week
, I understand that my old 4 pairs of TO3 Toshiba's, 2SB557 and 2SB427 is more or less obsolete and weak when it comes to the specs.
What I have in parts, whiches and knowledge
I have two EI transformers which I don't have data on but have measured to be something a bit over 200 VA or [email protected]
Four fresh electrolythics 10mF 63V. I have then about +/- 45 volt at idle and ~ +/- 40 after rectifyer and elyts.
The hardware including the cooling is no problem. I have plenty of surplus. I also want to etch my PCB for myself. I have equipment and experience but only for singlesided boards.
I have come over some ThermalTrak devises I would like to use in two pairs per cannel for this PSU's. So about [email protected] ohm, [email protected] ohm and maybe some current limit at 200w/channel.
What have I seen in this community?
I have read a lot of good reading and have get stucked on two designs that I want to do.
No.1 is Marshall Leach low TIM amplifier, version 4.5. When I first read about it here I faintly remembered an old article I have in a binder i our cellar. Could it be the same Mr. Leach ? Yes, I realised I had a copy of the first article from a Magazine called Audio, from 1977. I was in highscool then.I have memorys from a teacher who was sold on that amp.
Another fine "cute" project is MikeB and his Symasym 5.3 and particulary the one that evolved from the really capable authority roener at this forum. He also did a very fine singlesided Eagle layout but then... What happened? Is there anyone out there that has got one to share. I would very much like to continue with that one. Maybe MikeB knows of any further development and variants of the Symasym5.3 with the option to have two pair of ON Semiconductors ThermalTrak devises?
I would be glad for any project suggestion using two pairs of output transistors, ThermalTrak devices which will fit the PSU's I have at hand, Thank you.
This is my first post here, at last. I have been lurkin here for ages. Thats not normal for me.
I am often a contributor and have no problem with the verbal or writing in several different forums around the world. I am a big hobby enthusiast in electronics, but also genealogy and old American musclecars, among some other things.
My desire for a power amplifier which I have built myself have come up to my mind lately. I have gathered components through the years but after some extensive reading at this forum, old and new threads, several hours a day the last week
, I understand that my old 4 pairs of TO3 Toshiba's, 2SB557 and 2SB427 is more or less obsolete and weak when it comes to the specs.What I have in parts, whiches and knowledge
I have two EI transformers which I don't have data on but have measured to be something a bit over 200 VA or [email protected]
Four fresh electrolythics 10mF 63V. I have then about +/- 45 volt at idle and ~ +/- 40 after rectifyer and elyts.
The hardware including the cooling is no problem. I have plenty of surplus. I also want to etch my PCB for myself. I have equipment and experience but only for singlesided boards.
I have come over some ThermalTrak devises I would like to use in two pairs per cannel for this PSU's. So about [email protected] ohm, [email protected] ohm and maybe some current limit at 200w/channel.
What have I seen in this community?
I have read a lot of good reading and have get stucked on two designs that I want to do.
No.1 is Marshall Leach low TIM amplifier, version 4.5. When I first read about it here I faintly remembered an old article I have in a binder i our cellar. Could it be the same Mr. Leach ? Yes, I realised I had a copy of the first article from a Magazine called Audio, from 1977. I was in highscool then.I have memorys from a teacher who was sold on that amp.
Another fine "cute" project is MikeB and his Symasym 5.3 and particulary the one that evolved from the really capable authority roener at this forum. He also did a very fine singlesided Eagle layout but then... What happened? Is there anyone out there that has got one to share. I would very much like to continue with that one. Maybe MikeB knows of any further development and variants of the Symasym5.3 with the option to have two pair of ON Semiconductors ThermalTrak devises?
I would be glad for any project suggestion using two pairs of output transistors, ThermalTrak devices which will fit the PSU's I have at hand, Thank you.
