Left my DRRI on standby for 4 hours by mistake

Discussion in 'Amp Central Station' started by 8barlouie, May 23, 2019.

  1. 8barlouie

    8barlouie Friend of Leo's Gold Supporter

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    Is there any harm done in that? I thought I shut it down, but hit the standby by mistake. When I got back, everything seemed fine.
     
  2. TheDams

    TheDams Tele-Meister

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    Just 4hrs less on the tubes life... AFAIK.
     
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  3. rze99

    rze99 Poster Extraordinaire

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    Nah. I've had amps on for hours up on hours on end in between sessions and takes.
     
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  4. El Marin

    El Marin Tele-Holic

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    I had a TRRI almost two weeks ON and no problem. Still working
     
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  5. Seasicksailor

    Seasicksailor Friend of Leo's

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    No worries at all.
     
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  6. Heathfinn

    Heathfinn TDPRI Member

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    Seeing as some musicians play 3-4 hour sets nightly, I don't see it being an issue.
     
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  7. Wally

    Wally Telefied Ad Free Member

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    Leaving uses in the standby mode does cause an effect called cathode poisoning, which does cause deterioration of the cathode...which affects sonics and tube life. It is much better to leave an amp in the play mode.
    There are limited uses for a standby, and warming up tubes is not one of them. Cathode stripping, which warming tubes will prevent, takes place only at much higher voltages than we see in these tube amps. That cathode stripping takes place at voltages of 10,000 volts as I discovered in reading the pertinent info years ago. I subscribe to the ‘turn it on and leave it on until playing is done’ approach.
     
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  8. oatsoda

    oatsoda Tele-Meister

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    Up at the North Pole, it takes at least that long for the tubes just to start to glow.
     
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  9. uriah1

    uriah1 Doctor of Teleocity Ad Free Member

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    Nah...I have had many full day of forgetting If you consider old NOS preamp
    tube life was 15,000 hours, you should be ok.

    Now heat is another issue, especially if you had something near.
     
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  10. jhundt

    jhundt Doctor of Teleocity

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    I have frequently forgotten to turn off my Vibrolux 5f11 and left it on for several days. It doesn't seem to have any negative effect. Back in the tube days, many items were left on day and night, 24 hours 365 days. As long as there is adequate ventilation it should be OK.

    Wally mentioned potential cathode-stripping, and also suggested that it was unlikely in our guitar amps. I agree; I have never heard anyone describe an actual real-life problem with cathode-stripping, or what effect that would actually have on your tubes, amp, or sound.
     
    Last edited: May 23, 2019
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  11. Heathfinn

    Heathfinn TDPRI Member

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    I'd be more concerned about the electric bill you'll get shortly... ;)
     
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  12. bluesfordan

    bluesfordan Friend of Leo's

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    I went on vacation once and came home to find my DSL401 (from the infamous hot running generation) was on. I'm lucky it didn't burst into flames and take the house down.
     
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  13. King Fan

    King Fan Friend of Leo's Ad Free Member

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    Wally, of course, is exactly right. Merlin starts his chapter by saying, "Many guitar amps (too many) include a standby switch. This is meant to let the heaters warm up before the high voltage is switched on. Old books called it 'preheating'. But let's get one thing straight: a standby switch does not extend the life of the valves, in fact it is more likely to reduce their useful life." For all the details, including cathode poisoning, the whole section is an easy read and includes a history of how 99% of us came to believe, wrongly, in the standby fairy. :D
     
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  14. ricknbaker

    ricknbaker Tele-Holic

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    Well, when i was a child, the valve driven TV and Radio were often left on all day without bursting into flames.
     
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  15. stnmtthw

    stnmtthw Friend of Leo's

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    That was a really interesting read, and I learned something. Thank you for posting that.
     
  16. Lonn

    Lonn Friend of Leo's

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    I left a Peavey tube amp on over a long weekend once, pissed me off but no trouble.
     
  17. King Fan

    King Fan Friend of Leo's Ad Free Member

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    LOL, you've given me hope that my lonely quest to end standby use is not in vain. :) I doubt 4h will kill any tubes, but the existence of standby switches is misbegotten.

    There's the related issue discussed here of leaving the whole amp on. That's interesting too. Big huge tube installations (eg old computers that covered an acre, or radio stations) used to leave their tubes on even when they were off the air, to avoid on-off stress. But they could usually also dial down the power to lessen what we might call 'fatigue'. For sure 4h (or even 48) of simple 'on' probably won't hurt an amp. In fact I wonder if there's anyone out there who's actually never done it...
     
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  18. cottonmike

    cottonmike Tele-Meister

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    Rookie here.

    Why have a standby feature on an amp. What good purpose does it serve?
     
  19. theprofessor

    theprofessor Friend of Leo's

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    Yeah, like you guys are saying: there's leaving it "on," and there's leaving it on "standby." I don't think "on" is a problem at all. A fixed-bias amp is at rest when it's on. I'd be more worried about standby, but even then, it's probably no big deal in the grand scheme. But this is all the more reason not to have a dumb standby switch.

    I recently built a 5f4 with a standby switch and wired it with the switch in, simply because that's how I knew how to wire it. But I always leave the standby switch off standby and only use the power on/off switch.
     
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  20. John Owen

    John Owen Tele-Afflicted Silver Supporter

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    There are those (including me) who would say it serves no good purpose. I always just grab both switches at once and flip them together.
     
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