studiomaster powerhouse Horizon schematics

[GEOFFOS.]

I have a POWERHOUSE HORIZON 1208. and channel 1 has a lot of 'white
noise,'worse when advancing the 'gain control. I have tried replacing the
op-amp BA4560 the one nearest the Mic input channel 1. My problem is I cannot
identify the 2 transistors at the Mic gain control, think they are PNP low
noise devices BF A126B? but not found anywhere when searching from Google. The
other transistors are easily available: type BC549C. Is there anyone who
would know what type of Transistors these are or an equivalent?

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[Phil Allison]

"GEOFFOS."

I have a POWERHOUSE HORIZON 1208. and channel 1 has a lot of 'white
noise,'worse when advancing the 'gain control. I have tried replacing the
op-amp BA4560 the one nearest the Mic input channel 1. My problem is I
cannot
identify the 2 transistors at the Mic gain control, think they are PNP low
noise devices BF A126B? but not found anywhere when searching from Google.
The
other transistors are easily available: type BC549C. Is there anyone who
would know what type of Transistors these are or an equivalent?

** Studiomaster commonly used 2N4403s at the mic input.



..... Phil

 

[N_Cook]

I have a POWERHOUSE HORIZON 1208. and channel 1 has a lot of 'white
noise,'worse when advancing the 'gain control. I have tried replacing the
op-amp BA4560 the one nearest the Mic input channel 1. My problem is I
cannot
identify the 2 transistors at the Mic gain control, think they are PNP low
noise devices BF A126B? but not found anywhere when searching from
Google. The
other transistors are easily available: type BC549C. Is there anyone who
would know what type of Transistors these are or an equivalent?

Try 2SA126B