BC 109 improvement?
 

Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a direct
substitute?

--
*If at first you don't succeed, redefine success.

Dave Plowman London SW
To e-mail, change noise into sound.

BC 109 improvement?
 

"Dave Plowman (News)" wrote in message
...
Have a circuit from the '70s I wish to try and it uses BC
109/179
complimentary pairs. Is there a better choice these days that
is a direct
substitute?

--
*If at first you don't succeed, redefine success.

Dave Plowman London SW
To e-mail, change noise into sound.



BC549

BC 109 improvement?
 

On Mon, 06 Aug 2012 19:12:21 +0100, "Dave Plowman (News)"
wrote:

Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a direct
substitute?

These days, probably the 2N2222 and the 2N2907 would do the trick.
The BC109 was a strange transistor - touted as low noise, but it was
anything but.

Is there a schematic? Could offer better advice with a look at that.

d

BC 109 improvement?
 

"Dave Plowman (News)"

Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a direct
substitute?


** Nope.

BC109s and BC179s make excellent compliments for pre-amp circuits PLUS the
metal pack makes for ultra long life.

And certainly do NOT try Don's barking mad idea of using switching
transistors.



.... Phil

BC 109 improvement?
 

On Mon, 06 Aug 2012 20:04:00 GMT, (Don Pearce) wrote:

On Mon, 06 Aug 2012 19:12:21 +0100, "Dave Plowman (News)"
wrote:

Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a direct
substitute?

These days, probably the 2N2222 and the 2N2907 would do the trick.
The BC109 was a strange transistor - touted as low noise, but it was
anything but.

Is there a schematic? Could offer better advice with a look at that.

d

You can safely ignore the stuff from downunder. Switching transistors
are just as linear as any other kind. What makes them good for
switching is that when you turn them on fully they drop less voltage
across the collector and emitter.

If you are looking for ultimate low noise, consider connecting a
couple of transistors in parallel in each location. Double up on the
current so they are each still biased as before.

d

BC 109 improvement?
 

"Don Pearce = 100% Demented "
"Dave Plowman (News)"

Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a direct
substitute?

These days, probably the 2N2222 and the 2N2907 would do the trick.
The BC109 was a strange transistor - touted as low noise, but it was
anything but.


** Utter bull****.


You can safely ignore the stuff from downunder.

** The **** that drops out of you for example.


Switching transistors
are just as linear as any other kind.

** ******** they are.


If you are looking for ultimate low noise,


** The OP has not said he was making a low Z mic pre-amp.

For almost any other audio app, BC109s et alia are fine.



..... Phil

BC 109 improvement?
 

In article , Dave Plowman (News)
wrote:
Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a
direct substitute?

My initial reaction was that 'better' implies NOT a 'direct substitute'.
Having something 'different' AND 'the same' is a bit of a challenge... :-)

To clarify that I think you'd need to say more about what 'better' would
mean, or provide circuit details.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

BC 109 improvement?
 

On 8/7/2012 4:12 AM, Dave Plowman (News) wrote:
Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a direct
substitute?


As PA suggested, the BC109 came in a hermetically sealed metal can. That
made it superior to almost any plastic pack device. That said, modern
plastic transistors are pretty decent. Depending on the Voltage, current
and hFE requirements, you could use:

2N5087/2N5210 (ancient, but still excellent devices).

There are many others as well.


--
Trevor Wilson www.rageaudio.com.au

BC 109 improvement?
 

In article , Trevor Wilson trevor@SPAM
BLOCKrageaudio.com.au scribeth thus
On 8/7/2012 4:12 AM, Dave Plowman (News) wrote:
Have a circuit from the '70s I wish to try and it uses BC 109/179
complimentary pairs. Is there a better choice these days that is a direct
substitute?


As PA suggested, the BC109 came in a hermetically sealed metal can. That
made it superior to almost any plastic pack device.

Any reason why that should be Trevor?..

Or did you mean at the time the BC 109 came onto the market?..


That said, modern
plastic transistors are pretty decent. Depending on the Voltage, current
and hFE requirements, you could use:

2N5087/2N5210 (ancient, but still excellent devices).

There are many others as well.



--
Tony Sayer

BC 109 improvement?
 

On Thu, 9 Aug 2012 21:53:35 +0100, tony sayer
wrote:


As PA suggested, the BC109 came in a hermetically sealed metal can. That
made it superior to almost any plastic pack device.

Any reason why that should be Trevor?..

Or did you mean at the time the BC 109 came onto the market?..

The hermetic can became superfluous with the advent of passivation.

d