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PostPosted: Mon, Mar 04, 2019 5:28pm 
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Hack

Joined: Mon, Mar 04, 2019 4:56pm
Posts: 3
Are you human?: 951
My Renegade blew the F2 fuse yesterday. After I replaced F2, it then blew 2 fuses in F1. So I am pretty sure I have an issue with my 12v power on the preamp (no preamp heaters and no LED's light up).

Some additional info:

    Power section seem fine. All tubes light up and signal into the effects return comes out the speakers.
    F1 blew even with QC1, QC2 and QC3 disconnected from the preamp board.
    The LED's do light up for 2 or 3 seconds before the fuse "slow blows".

Things I have thought about trying:

    Could a shorted preamp tube do this?
    The bridge rectifier - how would I test this?
    The 2N3055 transistor. The schematic says it is hand wired/chassis mounted, but where is it?

I only have 3 more fuses left, so any advice or info on how to troubleshoot or fix this would be greatly appreciated.

Thanks,
Don


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PostPosted: Tue, Mar 05, 2019 11:05am 
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Hack

Joined: Mon, Mar 04, 2019 4:56pm
Posts: 3
Are you human?: 951
Ok, I pulled all of the preamp tubes and the phase inverter and when I powered it up it blew F2 again. F1 was fine this time. I've ordered more fuses, but is there a better way to test this? Should I rig up a dimmer switch on a power cord and try to trace the voltages or track down the problem that way? Any tips on how to test the Bridge Rectifier? How about the 2N3055 transistor? Any other ideas on where to start?

I sure would like to figure this out myself. I've modded and repaired other amps of my own, but this is the most difficult diy job I've encountered in my illustrious career.

Also, I've tried contacting Nate at Egnater, but no response so far. As a last resort, can anyone recommend any repair shops near Kalamazoo or Grand Rapids Michigan?

Thanks,
Don


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PostPosted: Wed, Mar 06, 2019 12:33am 
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Hack

Joined: Mon, Mar 04, 2019 4:56pm
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Are you human?: 951
Ok, It appears that C1 is toast. I didn't notice the slight bulging at the top, but as I was testing the bridge rectifier and removing the various 12v connectors, I noticed severe bulging/lifting/leaking at the bottom of C1.

It is a 10000uF 35V on the board even though the schematic says 25V. I assume I should replace it with a 35V as is on there, but I don't know where to buy good quality capacitors. Should I just grab one off of amazon?

Can anyone suggest a good source of quality capacitors?

Thanks,
Don


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