21194/21993 for 5200/1943?

[hschier]

What if i have to change 21194/21993 for 5200/1943?
is a problem the upper frecuency operation for the amp stability?
how it could be solve in the case?

thanks

 

[duncan2]

I like mysteries but without telling me what you are talking about I cannot help you.

 

[hschier]

I like mysteries but without telling me what you are talking about I cannot help you.

I am bulding a bryston amplifier clone and the design has mjl21193/194 in the power line.
I already have some 2sc5200/2sa1943 that i want to use.

what would be the effect in the amplifier?
thanks

 

[wg_ski]

It would probably work just fine - most of the time. The only issue could be exploding transistors or PC board fires if the amp is heavily loaded and pushed hard. Any protection circuitry designed for the 2119x series may not protect the more fragile C5200, and even normal operation with low impedance loads may be too much for them.

 

[hschier]

It would probably work just fine - most of the time. The only issue could be exploding transistors or PC board fires if the amp is heavily loaded and pushed hard. Any protection circuitry designed for the 2119x series may not protect the more fragile C5200, and even normal operation with low impedance loads may be too much for them.

so you don't recommend it?

I attach the circuit diagram.

 

[duncan2]

There is not much difference between them but crucially there is more DC gain output for a lower current output in the 2SC5200 .


On the other hand as Hschier says when pushed to over its limits it doesn't have the safety from breakdown that MJI 21193 has but you don't have to push it hard as it gives more output for a lower current .

 

[chalky]

I think there's a good chance that you'd have stability issues. The 21194/21993 have an ft of 4MHz whilst the 5200/1943 have 30MHz. The Bryston output stage, as shown, does not play nice with high ft output devices. If you use the 5200/1943 then be prepared to redesign the compensation scheme.