Quote from: EnzoYamaha makes good stuff.
:dbtu:
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Show posts MenuQuote from: EnzoYamaha makes good stuff.
Quote from: J M FaheyThe right side amp has doubled value (R4 430r vs R3 240r) because the other NFB resistor, R1 15r is in series with the other amp one , R2 15r , so it's also effectively doubled.
Both halves end up having the same gain, 240/15=16X but out of phase
Quote from: galaxiex
My thought was to see if I could calculate and increase the gain of the P/A somewhat,
Quote from: galaxiex
Actually, If you wouldn't mind...
A complete in-depth analysis with a layman's description of what every part does and why it's there would be good too...
Quote from: Vitrolinany how hed had 400VAC on all outlets in the listening room
Quote from: J M FaheyYou are generalizing from a sample size of >1<
Quote from: Rolywhy would a modern amp from a reputable builder have such an obvious parasitic (if nothing else is wrong)?
Quote from: J M FaheyTransistors vary in their characteristics
Quote from: J M FaheySomething may have been replaced and compensation became marginal, or something similar.
...
or maybe the Zobel network was open ...
Quote from: EnzoThat is why we want to always identify the actual problem and then fix that.
Quote from: gez239it randomly stopped working
Quote from: gez239I'm sure it had something to do with me running it through that cheap car converter.
Quote from: Vitrolinsomeone applied 380VAC to mains instead of 230
Quote from: DrGonz78it could have been someone who had a fault in the amp and just start shotgunning the thing to death.
Quote from: DrGonz78"you can always say NO to a repair"
Quote from: EnzoI am left to wonder at the health of R49 and R46
Quote from: ogeecheemanthe only damaged components I initially found were jfet transistor Q9 which literally exploded and R35- 4.7 ohm emitter resistor
Quote from: ogeecheemanfrom the power amp side of R48 nothing but wildly high negative dc voltage.
Quote from: Vitrolinit was said to be stable down to 8 ohms
Quote from: bluebooWith the device plugged in but not switched on : 0.3 mA
Or do you mean switched on but both volumes on 0?
Quote from: bluebooIt doesn't have a Send / Return only has Input, Footswitch, Pre-Amp Out, Power Amp In and Headphones