Paradise Builders

[sq225917]

Just wind the volume down on your pre/integrated, that worked for me.

 

[brozatus]

Hmmh,

it looks like I have the same problems? as Pepperman,

Output voltage is very low but wandering +0,03 to -0,03 v

Ext. RIAA 2,2 V

Dummy load 47R

Input is zero across the dummy resistor (but not changing when I use the trimmer!)

Regards,
Christoph

Tried a little more measurings to find my fault(s).
I can verify most of Heseners values, he published in the schematic amplifier annotated.pdf http://www.diyaudio.com/forums/group-buys/216891-paradise-phono-stage.html but I have ca. 5 V at pin 6 of the opa134 (should be around 0,5 V), on both of my boards.
Don't know how to fix this.

Christoph

 

[RCruz]

Output voltage is very low but wandering +0,03 to -0,03 v

Regards,
Christoph

With 10KOhm dummy it was underneath 1V, now it is underneath 100mV.

Looking good.

Let the boards on for some days... the output offset will come down as the capacitors settle.

In my case, I was able to listen to good sounds once the offset became lower than 15mV

After some time, the offset is now 4mV

 

[PMA]

Do you have the scope (at least 50MHz) to check the stability? In my phono pre, I cannot use AD797 for example, if I do, I have similar problems you describe here (measured with DMM), with scope I would measure 13.5MHz oscillations of some 40mV - with AD797 in my phono preamp.

 

[difool]

Conrad

Diotec BC327/40 Transistor PNP TO 92 1AA -45VV from Conrad Electronic UK

Which of these in Germany is similar to those in UK?
Bipolar-Standard-Leistungstransistor Diotec BC 327-40 PNP Gehäuseart TO 92 I(C) -800 mA Emitter-Sperrspannung U(CEO) -45 im Conrad Online Shop | 155829
Transistor bipolar Diotec BC 327-40 BK PNP Gehäuseart TO 92 I(C) -1 A Emitter-Sperrspannung U(CEO) -50 V im Conrad Online Shop | 140535

They are both from diotec, one with UCEO -50V 7 I=1A
and one with UCEO -45V and 800mA?

I did nit find clearer specifications for the 327 / 337 to help to choose.

 

[Marra]

These are the ones I bought.

Diotec BC327/40 Transistor PNP TO 92 1AA -45VV from Conrad Electronic UK

 

[difool]

Thanks, Marra,
I know. Because I wanted to user Conrad in germany I was loooking at the german page. They only offer the mentioned type but it is different to the one you ordered.
So to avoid sending from UK (which takes longer) i can choose between:

They are both from diotec,
one with UCEO -50V / I=1A
and one with UCEO -45V and 800mA

There are no ones from germany with -45V / 1A. What parameter is more important -45V or 1A?

 

[Marra]

Of that I am unsure.The ones I bought were what appeared when I entered the transistor type into Conrads search bar.I know it says Conrad UK but mine were delivered by UPS from Germany.

 

[difool]

This is even more crazy. UK sells for 5 pence (equal to 6 cent) but does not deliver outside UK. conrad.com sells the same spec for 18 cent, that is three times the price in UK!!! For the difference one could order in UK and send it to Germany and still save money ...

 

[pdul]

Try to take a look at Conrad Sweden, they are even more expensive

 

[sq225917]

I'd be happy to post out any UK orders for anyone. Glad to help out.

 

[PMA]

Try to take a look at Conrad Sweden, they are even more expensive

Socialist country MUST be expensive .

 

[brianco]

This is even more crazy. UK sells for 5 pence (equal to 6 cent) but does not deliver outside UK. conrad.com sells the same spec for 18 cent, that is three times the price in UK!!! For the difference one could order in UK and send it to Germany and still save money ...

Just ordered 200 of each type from Conrad-UK. Quantity discount on 327/40 = £0.03 each nett, NO QUANTITY discount on the 337/40(!!!!!) so they cost the full £0.09 each!!!

Seems strange. I will phone them in a couple of days and report back.

 

[heinz1]

The cheapest source for the Diotec BC327-40 and BC337-40 I found, is SOSElectronic in Slovakia:

BC327-40TAPE DIOTEC | SOS electronic

€0.0168 per transistor plus VAT (minimum order 100)

BC337-40TAPE DIOTEC | SOS electronic

€0.0166 per transistor plus VAT (minimum order 100)

Further discounts apply.

Possible drawbacks are:

- minimum order €50

- apparently doesn't deliver to private persons, only to companies.

 

[pdul]

Quote:
Originally Posted by pdul
Try to take a look at Conrad Sweden, they are even more expensive

Socialist country MUST be expensiv

Since when, has Sweden been a socialist Country?

 

[pdul]

Maybe Germany is a socialist country too, since its more expensive than in UK

 

[PMA]

The whole Europe is, unfortunately, and unable to compete.

 

[pdul]

Because the workers still gets a fair salary, and fights social dumping

 

[sq225917]

Yeh the UK gave up anything resembling socialism, or even fairness, years ago.

 

[deadhead]

Come one boys (and girls?) keep it on topic. We are already at page 70 with very few of these built yet.
Let's not end up with another 600 page epic.