WTF!

[Bewitagos1]

by the looks of all that, it might have been the bolts from the transformer that caused an arch inside the chassis.

regardless...contact service at 847-643-5120. they will be bale to help you out.

Steve, your diagnoses was correct with arcing, but the culprit wasn't the washer or nut from the Transformer. The bottom of the resistor has solder etched into it. (see photo below) I've had this problem in the past with circuit boards we farmed out to have wave soldered, either too much or too little solder pushed up through to the component side of the circuit board when the machine wasn't set up correctly or the circuit board had cleaning or inherent design issues.

In this case, the excess solder pooled over the foil under the resistor. it passed QC because the short hadn't occurred until I ramped up the current. Capacitance between the plate and ground occurred until the heat finally broke down the foil and you all had to suffer with my insistent quest for an answer.

 

[Bewitagos1]

Steve, in areas where high voltage is positioned next ground or other voltage sensitive circuitry, why not increase the spacing between these circuits during the etching process? In my situation, even if excess solder occured, I'd most likely be jamming right now.

I say this in a good way and still have nothing but the utmost faith in Randall.

Jimmie

 

[Bewitagos1]

And who said my training and 20 years in Electronics would never pay off. I have to admit, its been ten years since I left my broke-*** electronics gig behind, but it was sure rewarding to hear the results today when the RM100 fired up the 4x12 cab - hard - for an hour straight. The Pete Modded XL was shear evil with the Presense and Density pegged. Pete, help me understand how to tame that beast...holy *****!

Thanks everyone for inspiring me to not give up.

Jimmie

 

[jdr94]

bumpin up this old thread cause its the same thing that happend to mine almost, but what concerns me the most is the OP's pic of the tube board doesnt have wires connecting the tube sockets like mine....why?

also mine burned at the socket. i talked to Bruce about it, but he doesnt really want to do service by shipping so i guess i'm gonna send it to randall.

what was the problem in the end? i got el34s too and i'm starting to think theyre the problem

 

[Shinozoku]

I must have gotten some good ones, cuz I'm running two SED Winged =C= EL34's in my amp with some 5881's and it's been running fine. Sounds insane, too

 

[Bewitagos1]

I must have gotten some good ones, cuz I'm running two SED Winged =C= EL34's in my amp with some 5881's and it's been running fine. Sounds insane, too

the original RM100A boards that came with the two heads were from an older revision. I purchased two new updated boards from Randall and haven't had an arc to date (knock wood) I'm happy now.

 

[jdr94]

nice. well i hope randall can get mine back in action. i'm sure they will.