swr workingmans 15

[kip[py]

i have all the ic remove from pcb then give the amplifier bum...beep...bum ...beep

[J M Fahey]

ok R74 where can i find it on pcb ? or housing
oke R74 waar kan ik deze vinden op de print ? of behuizing

I do not see it, maybe it is under the board *or* they used fixed factory selected resistors.
Just curious, measure voltage from ground to 3 FET 2N5457 (Q13) legs, I think it's the metallic one.
2 should be 0V DC, one should be around -5 or -6V (Fet bias).

i have a velleman DVM345DI mulitimeter voltage setting automatically
ik heb een velleman DVM345DI mulitimter voltage gaat automatisch geen instellingen dus

Good multimeter.

i have see 0.220 ac with connect c13 preamplifier
ik zie hier 0.220 ac op luidspreker uitgang en c13 is weer door verbonden

Good, I expected that.
Now, short R78 (10K) from pad to pad with a short piece of wire.
Measure hum before and after shorting.

radio 3fm heet het tegenwoordig en is er nog steeds

Good !! I am listening it online.

i have all the ic remove from pcb then give the amplifier bum...beep...bum ...beep

????? For now leave the ICs as normal, just short R78.

We are following a path here, testing step by step.
Looks long, but is the shortest.

[kip[py]

ok the fet bias are 5.40 volt from O to fet bias G
R78 10k short piece of wire from pad to pad no difference

ok de fet bias is 5.40 volt van 0 naar G van fet
R78 10k een draadje tussen de weerstand geen verschil te horen en zien

[kip[py]

the amplifier works now thanks for the info