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Old 8th November 2008, 12:57 PM   #11
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Location: Recife - Brasil Northeast
Default Yes Mooly... i agree.

Yep Mooly... i can remember when i was visiting na englishman
that was living in Rio de Janeiro (1971)…he had an open reel tape recorder,
a 15 inches per second speed one…. Germanium transistors only…

He used to make recording from vinyl discs.. he used a RIAA pré
amplifier (2 stages each channel only..small and simple) and sent
the audio to the tape recording line in plugs.

I remember sound was nice… delicious I felt… vinyl sounds very good,
despite some pops we had into local discs..but never when listening
US made discs..much better ones related noises..better vinyl material and
top quality recordings…. US folks were great those days…maybe they
continue to be into this matter.

Inside the recorder Germanium transistors..only Germanium… even into
the bias oscilator.. and stabilized voltage supplies and relay switching…
poor ancient folks, down the sixties efforting themselves not to burn, they
were very sensitive to heat, low gain units, high noise, small bandwidth,
low powered units…. Nice sound.. started to conduct with 180 milivolts…
had enormous leakage (maybe this made some CCS into them..ahahahah)

Young folks do not know, or forget to thing about…but old folks had good
ears too… they had non acoustically poluted ears..not harmed ears because
the noises we have into our modern lives… they had references too, they
use to listen live Orchestra Performances…so, they know what is real, what
is high quality music…so… they were searching, those old days, for perfection
too…and they made all they could with the technology they had those days.

I am still searching a CD that can reproduce so good sound as vinyl… since
we started to our new synthethized computerized world, we forget the vinyl
sound…some folks have never listened…. There are pops but real analogue
music… waves are there..sound waves.. alike reality..into the groove there are
waves…no sampling…no reconstructions..not AD and DA convertions.. since
the first moment I have listened CD I dislike it a lot… have evoluted, bigger
sample..but really… Synthetical… you can play piano and them can play piano
Into a synthetizer… they are different… you can play guitar and them play acoustic
guitar into synthethizer… different… synthetic is synthetic… non natural
leather is non natural leather…orange juice is orange juice…chemical taste

Myabe the Germanium leakage produced a CCS effect!
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Old 8th November 2008, 01:07 PM   #12
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Location: london uk
Smile class a

Hi mr dx I see you put up my schematic on this forum good. But you did not built only simulated. As i said sound was very clear and sharp exceptonal detail, built with standard transistors ..i.e bc108,2n3055 etc. on stripboard!!
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Old 8th November 2008, 02:52 PM   #13
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Location: Recife - Brasil Northeast
Default I have those old folks here.. BC238, BC239... BC548, BC549

And also the 2N3055.... but no courage to assemble.

Those last weeks i have spent a lot of time into class A amplifiers, when they are not my prefered ones.

This one was not very good into simulator..when almost all amplifiers goes fine into simulators.... the good and worse ones shows good results into simulators... in the reality things goes different... imagine the one i found something strange into the simulator?

Sorry... i am afraid to assemble.


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Old 8th November 2008, 05:30 PM   #14
Mooly is offline Mooly  United Kingdom
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The first amp I ever made used AD149's and I thought it sounded great at the time.
I have just ended up here
Best sounding DIY SS amp

Simulators or the trusty old 'ere 'oles. I think the 'ere 'oles have it. People need to build things more, to try different ideas and circuits. Some of the old recordings are wonderful, even stuff from the 1950's can sound more life like -- less processed than many digital recordings. There's just something about the sound.
I said 'ere 'oles. That's something completely different your thinking of
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Old 8th November 2008, 06:12 PM   #15
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Default Mooly... i am Brazilian my dear...how can understand your oles.

ole in my mind is hOLE or Nat King C OLE.

When you arrive brazil, remember me to teach you how you ask for something down here.


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Old 8th November 2008, 08:01 PM   #16
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Default I have tried inductors into the output..because of the strange

damping shape wave form.... also tried capacitors and resistances.

Interesting... simulator blocked...stopped... dennied to operate, no simulation using inductors.

I am confused with that.. first time my "good will" simulator stops this way... seems to me problematic circuit.


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Old 8th November 2008, 08:26 PM   #17
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Default I am trying things into the simulator and

reading old text about Circlotron... also something from Elektor too.

Here you have voltages, currents and Vbes.


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