Transistor equivalents

[merbert]

Hi

There have been a couple of threads about replacements for the ZTX450 in the Aleph series. One mentioned that Nelson Pass had used MPSA18 in some of the Alephs. Another thread mentioned that the BC550C could be used.

What differences would using the BC550C make (if any) in an Aleph 4 clone?

Thanks

Merbert

 

[gaborbela]

HI
I have ZTX450 transistor for trade , I'm looking for ZTX550 ,BC550C & BC546B transistors .
May be we can help each other .
Regards

 

[Mad_K]

What differences would using the BC550C make (if any) in an Aleph 4 clone?

If any; slightly different bias.
The NPN transistors in the Aleph series amps are generic TO-92 low noise, mid/high beta NPN transistors. Almost anything decent will work. If you get any difference in bias current, you can adjust one resistor vaule to get what you want. I used BC550C in my Aleph30

 

[Nelson Pass]

In these locations, generic transistors work just fine, and the
choice at any given time has been how many I already have in
stock.