Fender FM 65

[Valvehead]

Got it ---thanks---ill report back when i get one

[Valvehead]

Ok , what is the acceptable temp range on these transistors ?? Somethings still not right (i think? )

Amp is powered up--no bulb limiter , no output load .

Just replaced Q17 / 6 /8 .

The temp is creeping up to over 95 before i shut it off on Q 11 , Q 15/17/18/19 .

Everything else is at 66-70 degrees . There is no Dc at the speaker out . The bulb is dark now if i use the limiter even with a load on output

[Valvehead]

Forgot to add = voltages look normal now at the 4 output chips

[Helmholtz]

The temp is creeping up to over 95 before i shut it off on Q 11 , Q 15/17/18/19 .

95 what?
95°C would be excessive. 95 degree Fahrenheit corresponds to 35°C and should be no problem. Semiconductor temperature tends to get critical, when it's too hot to touch (above 50°C to 60°C).

[Valvehead]

95 F and creeping up.

Im just asking because i dont want to see magic smoke come out of this thing

[g1]

Are all transistors bolted to heatsink and all heatsinks completely assembled to chassis? What are your DC voltages across R103 and across R105 ?

[Valvehead]

Are all transistors bolted to heatsink and all heatsinks completely assembled to chassis? What are your DC voltages across R103 and across R105 ?

I didnt think of that...the pcb is out of the chassis. Ill put it back in and check

r103 / r105 , 4mv and 10mv to gnd

Edit----good call G1 , amp is back together and everything looks stable now....will try it tonight

[Valvehead]

Amp is up and running , sounds great -- thanks everyone !!!!!