Egnater Renegade over heating

Discussion in 'Amp Tech Center' started by Dean of Decibels, Jul 8, 2018.

  1. Dean of Decibels

    Dean of Decibels TDPRI Member

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    I have an Egnater Renedgade on my bench that sounds great but feels too hot to me. A few weeks ago we replaced the 10,000mf C1 cap in the power supply and also 2 pc mounted fuse-holders between the bridge rectifier and power trans. This model has external bias adjustments built in so we set those. I had to replace the 2 6l6/5881 in order to set the bias according to the owners manual. We played it a lot, even though it seemed hot (NOT red-plating) we let it go.

    Of course it came back. Same fuses blown again and the bridge rect blown. I replaced them and once again the amp is running on my bench sounding good but I don't trust it now.

    From reading blogs I found these possible solutions:
    1.Replace the cathode resisters on all 4 power tubes.
    2.Re-adjust the bias a little cooler (lower current)

    Any other suggestions?

    Mike
     

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  2. flyswatter

    flyswatter Friend of Leo's

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    Why not contact Bruce Egnater directly. He's a member on the FB group "Tube Amp Builders" and others. Very helpful and forthcoming with his comments... If you join that group and repost the above, he's sure to chip in.
     
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  3. Dean of Decibels

    Dean of Decibels TDPRI Member

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    I heard he was from the Detroit area. OK. Thanks.
     
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  4. wanderin kind

    wanderin kind Tele-Meister

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    yeah they run hot, had to put in a resistor in series with the choke, this lowers the screen voltage a bit, which drops plate disp.

    does yours have a fan? something about the cabinet that amp sits in, does not get a lot of air.

    scary amp to work on, wires everywhere, logic chips, going from those amps to Fender 65 Blackface is like heaven on earth.
     
  5. Dean of Decibels

    Dean of Decibels TDPRI Member

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    Hey! Yes it has a fan already in the cabinet. It also has 2 after market Mercury transformers for power and output. Wondering if those are letting it run hotter then normal?? I REset the bias lower then the manual called for. Manual called for 60-70mv for the 6l6/5881. I set it at 58. They wanted the EL34s at 65-75mv. I put them at 63. its been on for about 20 mins with a test tone...
     
    Last edited: Jul 11, 2018
  6. wanderin kind

    wanderin kind Tele-Meister

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    Check your plate voltage, maybe the Mercury pwr xfmr is running high.

    lowering bias would compensate this.

    don't worry about getting shocked. unless you work on 220 KV power grid wires hanging off steel towers.
     
  7. Dean of Decibels

    Dean of Decibels TDPRI Member

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    Ha! You are funny. The plate voltage is 425v on all 4 out put tube plates. Its been on about 15 minutes with a test tone at low volume. The bias is .62v at EL34s and .59v at the 6L6s.
     
  8. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    Can you let us know what the model numbers on the replacement transformers are? That might give us some more thoughts.
     
  9. Dean of Decibels

    Dean of Decibels TDPRI Member

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    Hey yes. It's still here. The part numbers are EG-Renegade 65-O and 65-P.
     
  10. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    Mercury doesn't have the specs available on the site.

    If you email them I've found Patrick to be very responsive to emails and he should be able to get you the specs. We just want to make sure it really does have the same voltages on the power transformer that we'd expect to see on the schematic with a stock unit. it should, but doesn't hurt to check.
     
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