Evh 5150 plate voltage modulating?

[nevetslab]

I got a look at the EVH 5150 schematics and PCB layout drawings....that IS the unit I have in the shop. The power tube PCB is foil side up, when you have the chassis open side up, so without the details, I wasn't aware of there being the common 1 ohm resistor in place for the two test points. I had set it for 22mA before I buttoned it up, so it's certainly in the ballpark now. I wasn't aware Fender took that product on, or is building it while it's still marketed as the EVH product. The power supply voltages are still lower than what's stated in the Fender schematic. I do see there is a NTC Thermistor on the primary. I was only making idle mode voltage measurements in checking the output stage, so perhaps that thermistor hasn't yet dropped down to it's low-ohm state. Or, perhaps the power transformer is not the same one as called out in this document. I'm not going to worry about it....since the amp is back up and running and not seeing any operational issues now. Just observations.

Thanks.........Steven

[Enzo]

EVH was a Peavey model name along with 5150. When the agreement ended between PV and Eddie Van Halen, he owned the rights to "EVH" and "5150". SO PV changed the names of their products to 6505 and 6505+ instead of 5150 and 5150-2. Otherwise identical to old models.

Eddie then hooked up with Fender some time later, who made the EVH3. Basically pretty much a clone of the 5150-2 PV had made. They put EVH on it like it was a brand, but the amp is a Fender product. It is also called the 5150-3.


Voltages are approximate, and the inrush thermistor heats up in a few seconds.