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Old 18th September 2008, 03:01 PM   #1
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Default ETI 470 + ETI471 Schematic

Hi, everyone.

I am looking for the ETI 470 amp, ETI 471 pre amp Schematic and PCB layout.

it used the philips BDV64/64 output transitors.

published in May 1979

Can any one help.

Many Thanks
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Old 19th September 2008, 04:06 AM   #2
Filby is offline Filby  Australia
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Here you go...
http://www.4shared.com/file/63555882...2/ETI_470.html
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Old 19th September 2008, 10:16 AM   #3
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Many thanks for posting it Filby
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Old 19th September 2008, 06:08 PM   #4
Symon is offline Symon  United Kingdom
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Just a quick note as I build this power amp many years ago.
The amp sounded great but was unreliable. This proved to be because the specified power supply voltage was just too high.

In the original 1979/80 version the power transformer was 30-0-30, and could cause break down of the input devices.
I note in this version it's 28-0-28, I ended up using 25-0-25,
as a safe option.

I also added some over current protection set to 3 amps, which saved the output devices from thermal runaway when I didn't get them perfectly flat on the heat sink.
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Old 19th September 2008, 07:15 PM   #5
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Default THE ONLY REASON

i would built a think like that is for fun ....

in any case you decide to do so keep in mind that your outputs have to be made my the same mom like you cannot have a bdv 66 from philips and a bdv 67 from ST ...

the reason is that they may say that they are bdv 66 or 67 but due to the construction inside might have diference ( not matching ) inside depending on the part number ......

any way i would go for ON SEMI MJ 11015-16 FAR MORE BETTER AND ROW BUST .....

to symon

the above reason is NO 1 reason for thermal runaway cause in this case you adjust idle to specs but that apply only when amp is on idle if you power it up then things are pretty much messed up

measuring voltage drop on every emmiter resistor might be some help cause you may find some diference there but still that cannot tell you much since even if you do find a diference there is nothing you can do about it ......its just an indication .....

regards sakis
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 10th November 2008, 09:47 AM   #6
dangus is offline dangus  Canada
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I built one of these too, but I used TIP transistors for the outputs. Transformer was 56VCT, with 26,000 uF per rail for a stereo amp.

ETI (though not the Canadian edition) later published an input buffer board for this amp since in the stock form it has a pretty low input impedance. I've got a photocopy someplace, which I ought to scan.

I blew a channel once by shorting the speaker cable, and more recently blew both channels when I used it as a DJ monitor amp. I'm leaning towards filling the box with LM3886's instead...
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Old 10th November 2008, 10:49 AM   #7
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Default MAKE YOUR

SHELF A DX AMPLIFIER FROM CARLOS DESTROYER X

you are simply going to love it .....3886 is fine but not so nice as dx
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 10th November 2008, 04:48 PM   #8
crt is offline crt  Indonesia
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oh no, DX Standart VS 3886 ?

i have build a DX Amp, sound to superb if compare to lm3886.
JUST GO FOR DX AMP! by Carlos MERGULHAO.
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Old 2nd January 2013, 08:22 PM   #9
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Default ETI 470 + ETI471 Schematic

ETI 470 + ETI471 Schematic

Hi I'm also looking for these circuits - a blast from the past !

Can anyone help ? The link about does not work now after 4 years. Any info re the Electronics today international ETI Magazine article would be gratefully received.

I think it's from ETI Ether July Or May or June or July or most likely or December 1979 - It's 1979 anyway.

Many many kind Thank yous ! :-)

Simon
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