Transistors equivalent for amplituner

andreidaniel · 2013-03-15 8:50 pm

Hello everybody! I have to remake the audio board for an industrial amplituner. The aplifier module.
The problem is that I don't find the BC239C the low noise transistors for the preamplifier and tone controle.

Here is the diagram. Can be substitued with 2SC1815GR with a hFE of 290 or with a 2SC945P with a hFE of 394? If I put one of those instead of BC239C the audio correction for Tape, Radio and Magnetic Phono will modify?

Also the BC307A from the differential input stage of the power amplifier with a hFE of 120 I cannot find..Can I replace it with 2SA733P or 2SA1015GR?

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Project16 · 2013-03-15 9:24 pm

Hello andreidaniel!

According to my records the BC239C can be replaced by a BC549C or BC550C.

andreidaniel · 2013-03-15 9:29 pm

Ok, thank you! I'll try to see if I find them. From what I remember I saw in the local shops the BC546 or 547 but with "A" or "B".. If I wouldn't find them it is possible one of the two posibilities? Or maybe a BC109C or S9014C or D? I also checked for BC413 or 414 but I didn't find them; them also were used in such preamplifier because of low noise.

What about BC307A?

Project16 · 2013-03-15 9:33 pm

BC307 => BC557, BC212.

andreidaniel · 2013-03-15 9:36 pm

And nothing, no correction should be modified? BC549C or 550C have 500mW instead of 350 of 239C.

Project16 · 2013-03-15 9:47 pm

Here is a scan of my documentation (sorry for the quality).

Project16 · 2013-03-15 9:59 pm

Oops!

andreidaniel · 2013-03-15 10:10 pm

Thank you! I'll try to find them. The big problem, usually is with the pnp transistors.. There are more chances not to find one pnp type, but the preamplifier is important for me because I have a phono at home.. I'll be back with the results when will be done. Is a romanian amplituner which was made with polish components, but assembled in RO. The original amplituner (polish) was Unitra Diora (TOSCA) AWS-303. Until now I "pulled it"on band, to receive 98-107MHz with a converter.

andreidaniel · 2013-03-15 10:13 pm

PS: Do you also have an equivalent for BDP 395 and 396? From what I have heard it can work with BD249/250, 2N6488/6491 and BD711/712 or 911/912.

Ian Finch · 2013-03-15 11:25 pm

andreidaniel said:
PS: Do you also have an equivalent for BDP 395 and 396? From what I have heard it can work with BD249/250, 2N6488/6491 and BD711/712 or 911/912.

These are generic parts and any of those substitutes will work. Choose current types like BD911/12 that can be replaced easily.

Transistors equivalent for amplituner

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