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Hello, I replaced all capacitors and all resistors not good on my ampli. I added somes cap on rectifier for 50hz. Now the ampli seems to work but I can hear 50hz again and just I power the circuit the 2n3055 become very hot (after 10seconds).
I have not replaced the prefinal (BC141 and BC 161)...
...yes, I replaced all electrolytics (some was evidently burnt!). The amplifier now seems work but I hear smoothly 50hz again .... The ampli is >30 yeard old... and it is very simple.
Bye bye
The component is mounted on a little BF amplifier and is mounted in contact with the aluminium heat sink of two 2n3055).
I measured it with an ohmmeter that gets 0 ohms.
Is it normal?
Does the color cod the same as resitors? (green - black -> 50ohm)
Hello, I'm trying to repair an old amplifier, I haven't got the schematic.
There is a PTC (or NTC) wich is in short circuit (see the image attachement).
It is black with green top.
Anyone has an idea wich component is? (PTC or NTC I believe) and how I could know its value?
Thank you for your...
Re: 2SK1199 (not 2SK1189!!) substitution with P6NA80
Yes, the original part is 2SK1199 ... sorry for typo.
In attachement there is the PSU schematic where I have to substitute Q1 (and some open resistors).
Thanks a lot!
Emanuele
Hello, in a switching power supply unit there is 2SK1189 broken mosfet.
A cross reference give me BUZ51 as possible substitute.
I have a P6NA80 ... could I replace the 2sk1189 with this last one?
Thank you
Emanuele
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