seanz
New Member
Posts: 44
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Post by seanz on Nov 8, 2015 20:36:59 GMT -7
Hey guys, I've been trying to do some recording with an EZG-50 combo. I live near a radio station and the EZG-50 is picking it up with nothing plugged in....just the amp turned on. I read that it might have something to do with the reverb tank, which I don't use for recording, so I pulled the wires going to and from the tank. Radio signal went away, but I'm worried about running the amp this way. Anything to be concerned about? The amp sounds a bit different....but it could be my mind playing tricks. I'm actually surprised that the amp still passes signal, and the reverb knobs still seem to effect the eq/noise level of the amp....why would this be? Thanks, Sean
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Post by wraparound (Steve) on Nov 8, 2015 21:25:01 GMT -7
Sean, wish I knew how to help the problem, but maybe if you post this in the "ask the experts" section for troubleshooting it will get the right answer faster. They'll help you there for sure.
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Post by purpletele on Nov 9, 2015 0:52:41 GMT -7
Sean, That is am interesting Phenomenon. I had read some threads recently and it seems that you are in the right area with the reverb cables. Here is a note from the dugout. Post by DRZ on Sep 16, 2009 at 11:45am Also check your Reverb Cables. They may be a bit loose at the chassis connecting point. Pull each one out one at a time and try to squeeze the RCA jacks ground tabs so the jack fits tightly. If this happened all of a sudden possibly a bad V3 ( 12AT7 ) or bad V4 ( 12AX7 ). If RF interference still persists Radio Shack sells a snap on Ferrite Bead ( Radio Shack Part Number 273-069 ) buy two and snap on each reverb cable. DR.Z Read more: ztalk.proboards.com/thread/25201/radio-interference-noise#ixzz3qyjBHaYC
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Post by DRZ on Nov 9, 2015 12:54:29 GMT -7
OK Sean, I'll need to know your S/N as we have incorporated RF bleed caps to all Reverb amps since 2010 I believe. This cap eliminated 99% of the RF problems. But remember all pre-amp tubes are Receiver Tubes by design to receive radio frequency so the problem is inherent. The reverb cables act as antenna's and pick up stray RF, and deliver it to the amp. You can run with the reverb cables disconnected while in the studio, but I think you can spin your amp and de-tune the radio station . Try moving and turning it , like turning the knob on a radio. Contact Don in our repair dept. and ask for a photo of the RF bleeder cap from the EZG chassis , then check if yours has it.
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seanz
New Member
Posts: 44
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Post by seanz on Nov 9, 2015 22:00:28 GMT -7
Thanks Doc! The serial is T26175. It was at the shop earlier this year....might the RF cap have been added then? Lastly, would pulling the reverb cables have any effect on the tone of the amp? Thanks, Sean
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Post by DRZ on Nov 10, 2015 3:57:29 GMT -7
That is 2009 build so it probable doesn't have the RF cap. Can't say if it was added during service, probable not if the issue of RF wasn't a problem then. The only change in tone will be of course a dryer sound with no reverb.
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seanz
New Member
Posts: 44
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Post by seanz on Nov 10, 2015 10:22:08 GMT -7
That's good news! I'll try moving the amp around, but worst case I'll just pull the cables. I prefer to add reverb to taste after capture. Thanks, Sean
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