Esart e250 french amplifier.

[anderslober]

Hi forum. Well built French amp from the late 60’s on the the bench. I cant find a scat/sm for the unit.

I need to determine the wattage of the ps resisitors. They are quite big/thick legged…..see picture. The blue resistor is a 3w. What do you guys think the brown resistor was? The brown original resistor measured 2.589k…..it should measure 2.2k. The other side brown resistor measures nicely at 2.21k.

 

[John3655]

It's only 17pct off,
5 watt possibly, do you know what the voltage drop and likely current is, p=v * I. It can't be much more otherwise it would need to be physically bigger, 10w resistors are typically twice the length.

 

[anderslober]

Yes….onky 17-18% of…(that is quite a bit in my opinion)....but, I think it may be affecting the input voltage to its amplifier card. The ‘good’ card has 32vdc input. The ‘bad’ (where this resistor comes from)card has 28.4vdc input. They should be equal, as this affects voltages down the line….
I dont have any big 2.2k 5w resistors…….probably should get some…