Kenwood KA-400

[gecko]

Okay, thank you anatech! 😀

 

[cosmin_nfmdeva]

kenwood ka-400

hi.i have the same amplifier...and few of my resistors are burned.can somebody help me with a schematics?
what are the 3 legged white resistors?

 

[anatech]

Hi cosmin_nfmdeva,
Those three legged resistors are non-inductive plate resistors used in output transistor emitter circuits (normally).

PM me.

-Chris

 

[cosmin_nfmdeva]

tks anatech...but how can i replace them with 2 legged resistors with the same power and the same resistance? does anybody have a service manual(schematics)..

 

[anatech]

Hi cosmin_nfmdeva,

PM me.

Replace with the flat non-inductive ones. Do not use the "bathtub wirewound types !!!

😀

-Chris

 

[cosmin_nfmdeva]

The problem is that i found here only 2 legged ceramic resistors 5W,0.47ohm, I dont know if they are good and how to connect them? they have only 2 legs

 

[cosmin_nfmdeva]

and there is another problem...i have few resistors burned and i dont know their value..i cant find schematics nowere its R44,R46,R48,R50,R43,R45,R47,R49,R33,R34.and what are TH1 and TH2. i think its a long list. with schematics will be much easier

 

[anatech]

Hi cosmin_nfmdeva,

The problem is that i found here only 2 legged ceramic resistors 5W,0.47ohm

Sounds like the older "bathtub" style 5W axial lead resistors. If so they are the wrong type. THe singles will resemble the dual type, but shorter with two legs.

Time to buy the exact ones.

-Chris

 

[cosmin_nfmdeva]

so there is no other way to replace them.all i found was that 🙁

 

[anatech]

Hi cosmin_nfmdeva,
You need those. Look further on the internet and buy your other parts there. Inductive resistors may cause oscillation. Don't use them.

-Chris

 

[cosmin_nfmdeva]

ok.i will try to find non inductive.But if they are 2 legged...how do i connect them on the board

 

[anatech]

Tie two legs together. Allow one to hange down. See? A three legged resistor.

-Chris

 

[cosmin_nfmdeva]

I think i made u crazy 🙂 doesnt it matter in what hole i connect the common leg?

 

[cosmin_nfmdeva]

and tks alot. good night. if u ever find a link with a sckematics..pls reply here

 

[anatech]

Hi cosmin_nfmdeva,
Please.

Check your mailbox.

The common leg goes in the middle.

-Chris

 

[cosmin_nfmdeva]

tks so much..u helped me a lot

 

[cosmin_nfmdeva]

one last question: do u know what is TH1 and TH2?

 

[anatech]

Hi cosmin_nfmdeva,

do u know what is TH1 and TH2?

Yes, they are thermisters. Temperature sensitive resistors. They are normally rated at the resistance at 20 °C, could be 25 °C. They don't often fail.

-Chris

 

[cosmin_nfmdeva]

what value have those termistors..are they the same as the resistor .Or it doesnt matter the value? i have there only a wire (thats how i bought this amplifier)

 

[cosmin_nfmdeva]

i changed burned resistors, the Q14 and Q15 tranzistors and now the fusible F2 gets burned. I think i have to take it to some specialist