Hello
I have a problem with the resistor 15/5w R73.
Its get to warm and smelt the solderpoint
Can I take it away or not.?
Regards
Geir
It is not normal for R73 to get very hot. This indicates a too high current consumption in the HT section. Check your assembly. Start by removing all tubes and measure voltages. Compare with manual. Be extremely careful when measuring on a live amp. Voltages in this amp can kill !!
Hello
Its have not high current too HT, Its have 390V and are 0.5 V past the R73. And the amp have a correct Voltages.
And i think to have a 25W resistor and mont to cap?
We think there must be an error somewhere. If the voltage you’ve measured over R73 would be correct (0.5VDC), this would mean that the resistor would dissipate 0.5/15*0.5= 0.016W. Such a low dissipation can never cause it to get hot. Are you sure the value of R73 is correct ?
Also, make sure you did not make a measuring error.
[quote=“VEL417”]We think there must be an error somewhere. If the voltage you’ve measured over R73 would be correct (0.5VDC), this would mean that the resistor would dissipate 0.5/15*0.5= 0.016W. Such a low dissipation can never cause it to get hot. Are you sure the value of R73 is correct ?
Also, make sure you did not make a measuring error.[/quote]
Hello
Yes it is 15ohm / 5w
And i think to have a 25w resistor
And i find not any errors
Putting a 25W resistor onto the board would be a workaround, not a solution to the problem. We strongly suggest that you look for the cause of the overheating. If you cannot locate it yourself, please seek local help.
For some reason the HT section is drawing too much current. Remove all tubes and check if the resistor still heats. If it does, there is a short or a too low impedance somewhere. If all is OK, start with the small signal tubes and afterwards the power tubes. Check all voltages, both with and without tubes.
[quote=“VEL417”]Putting a 25W resistor onto the board would be a workaround, not a solution to the problem. We strongly suggest that you look for the cause of the overheating. If you cannot locate it yourself, please seek local help.
For some reason the HT section is drawing too much current. Remove all tubes and check if the resistor still heats. If it does, there is a short or a too low impedance somewhere. If all is OK, start with the small signal tubes and afterwards the power tubes. Check all voltages, both with and without tubes.[/quote]
Hello
All the voltages is correct…