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Modular Amps
Egnater / Randall Modular Amps
Opinion needed on troubleshooting RM50 please-Relay problem?
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<blockquote data-quote="roszatycki" data-source="post: 120842" data-attributes="member: 2234"><p>Roman,</p><p></p><p>If I was troubleshooting the amp I would do a couple things to verify the relay is bad. First, I believe that is a 12 volt relay so I would verify I am getting voltage to the relay to engage the internal contacts. Sounds like you are but a bad solder joint or failing component which Rob eluded to may cause the relay to act strange. Second, I would look at the data sheet or Randall schematic and simply jumper the signal path bypassing the effect of the relay altogether. If the problem still exists I would say it is not a relay problem. Not sure how advanced you are in electronics or if you feel comfortable trying those suggestions.</p><p></p><p>A few years ago I picked up a used RM50 that needed some repair work. It was one of the first generation RM50's that had some issues with high voltage arcing on the power tube board, typically with EL34's. Anyhow, I repaired it and used it for a period of time but eventually it arced some high voltage again and considering the $100 I paid for it and my purchase of an RM1250 I didn't bother with it much. Other than the high voltage issue, the amp functioned fine. I still have the entire module board in perfect condition if you wanted to try swapping the board. I would assume they would be compatible. If they are it would be a quick way of repairing the amp or if nothing else eliminating anything on that board as the culprit. PM me if you have any interest.</p></blockquote><p></p>
[QUOTE="roszatycki, post: 120842, member: 2234"] Roman, If I was troubleshooting the amp I would do a couple things to verify the relay is bad. First, I believe that is a 12 volt relay so I would verify I am getting voltage to the relay to engage the internal contacts. Sounds like you are but a bad solder joint or failing component which Rob eluded to may cause the relay to act strange. Second, I would look at the data sheet or Randall schematic and simply jumper the signal path bypassing the effect of the relay altogether. If the problem still exists I would say it is not a relay problem. Not sure how advanced you are in electronics or if you feel comfortable trying those suggestions. A few years ago I picked up a used RM50 that needed some repair work. It was one of the first generation RM50's that had some issues with high voltage arcing on the power tube board, typically with EL34's. Anyhow, I repaired it and used it for a period of time but eventually it arced some high voltage again and considering the $100 I paid for it and my purchase of an RM1250 I didn't bother with it much. Other than the high voltage issue, the amp functioned fine. I still have the entire module board in perfect condition if you wanted to try swapping the board. I would assume they would be compatible. If they are it would be a quick way of repairing the amp or if nothing else eliminating anything on that board as the culprit. PM me if you have any interest. [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
Opinion needed on troubleshooting RM50 please-Relay problem?
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