Ampeg pf-500 volume - is it me?

Discussion in 'Amps and Cabs [BG]' started by heavyfunkmachin, Jul 15, 2021.

  1. heavyfunkmachin


    Jan 21, 2005
    I play passive bases + effects into an ampeg pf-500 and a barefaced big twin

    I’m not here to bash the amp, but to gather feedback from other users: I’ve had the amp for a few years, just recently I started to play with a louder drummer and started experiencing some cut outs. Not full shut down or smoke, just a few seconds of no sound and then back to “normal”

    With no compression, ultra high or ultra low, no crazy eq settings (minor mids cuts/boosts to fit the room) and a very moderate gain ( around noon, no peak light flashing whatsoever) and adjusting master to fit the drummer volume.

    The issue I face is that if volume goes past noon with the above settings I get some sound cut outs in volume peaks. I don’t have a second pf-500 head to compare, so my questions is : with those moderate settings a and a great 4 ohm cab, Should I be able to play with no cut outs when volume passes 12 o’clock?

    I feel I SHOULD be ok, but I need to confirm if others can and my head is faulty or if I’m asking too much volume from this head

    thanks in advance!
    jeff7bass and DJ Bebop like this.
  2. I had one that did the exact same thing with a 4 ohm load. It's a common issue with those amps
  3. heavyfunkmachin


    Jan 21, 2005
    did you had one that did it and one that did not do it? Or do they all do it?
  4. It's a certain revision of the amp that is prone to it. I think the newer versions don't have the issue. The one I owned did cut out at volume with a 4 ohm load.
    DJ Bebop and heavyfunkmachin like this.
  5. My PF 800 cuts out with 4 ohm loads. Relegated to single (8 ohm) cab use now with no problems.
    DJ Bebop likes this.
  6. mojomike001


    Mar 28, 2013
    South Florida
    Since you've had the amp a few years, I'd suggest opening up the case and making sure everything is clean and dust-free so that cooling is maximized. It couldn't hurt.
  7. heavyfunkmachin


    Jan 21, 2005
    I’ve done that… but it does not seem to be a thermal related issue, no heating, more a circuit protection one….

    thanks none the less!
    mojomike001 likes this.
  8. BassAdder27


    Nov 16, 2020
    I had a new PF500 (2020 build ) and it wasn’t a loud amp at all.

    Just got the new Orange Little Bass Thing 500w head and it’s way louder and has a better tone too.
    Moosehead1966 and AlexanderB like this.
  9. JeezyMcNuggles

    JeezyMcNuggles Supporting Member

    Feb 23, 2018
    Santa Maria, CA
    I suck, but nobody really notices
    Pf500 has problems. They always have. Pf800 does not. You should buy the 800. I have 2 of them. It's a killer amp.
  10. JeezyMcNuggles

    JeezyMcNuggles Supporting Member

    Feb 23, 2018
    Santa Maria, CA
    I suck, but nobody really notices
    I've never had a problem with my 800. I've cranked it through everything from a 112av, to a fridge.
    TinyE likes this.
  11. Eric Swaim

    Eric Swaim GOD, U.S. MIlitary, Country Supporting Member

    Sep 21, 2004
    Murfreesboro, TN
    I had the same experience with those amps and I no longer play any Class D amps. They always seem to state higher wattage but never deliver. The Eden WTX-500 was the last one that just never sounded right to me and I owned 2 of them. These days I play older SWR heads from the late 1990's. May be bigger and a little heavier but no issues.
    Slaphound, Jim C, ElMon and 4 others like this.
  12. Oooh! You're gonna tug Agedhorse' tail with that post (if he sees it that is). (-;
    bdplaid and lowendrv like this.
  13. skyline_01

    skyline_01 Endorsing artist: Nordstrand Audio, Tsunami Cables Supporting Member

    Nov 14, 2006
    Lebanon, OH
    I had a PF500 up until a couple years ago. Never had the cutout problem but I've heard from plenty of other folks who did.

    I do concur with some others here that it didn't seem to have the "oomph" factor - seemed like I had to run it at high volume even on smaller gigs. Nowadays I use an EBS Reidmar 750 and it gets STUPID loud and stays clean.
  14. Ampslut


    May 15, 2017
    Barrackville WV
    hmmm. I used mine with the 4ohm cab that is my avatar, no problems here
    JeezyMcNuggles likes this.
  15. I've had the same experience too. I just stick with my GK800rb, 400rb, and 700rb. I will say that I have heard great things about the new GK legacy class d as well has Mesa and Genzler Class D. I'm sure the technology has improved in the past few years. For now I'm happy with my GKs.
    Eric Swaim likes this.
  16. vvvmmm


    Dec 6, 2016
    Do a search here and web, "PF500 issues", etc.

    The scuttlebutt is the first version or two had issues, since resolved. I know that you can identify possible problems by what "Rev." (revision) is listed on the board.
    Last edited: Jul 15, 2021
    Garret Graves and lowendrv like this.
  17. drumvsbass


    Aug 20, 2011
    This might sound like an obvious one, but what kind of speaker cable are you using?
  18. barrel650


    Dec 16, 2014
    ive owned a pf 500 for about 7 years now , played through an acoustic 810 cabinet full of eminence speakers (the factory 10s are garbage) and i have had zero problems (knock on wood LOL)
  19. For some insane reason people thing that the position of the volume control is an indication of how much power the amp is putting out. With the gain at noon and the volume at noon most likely you are Pushing things a bit . This was not intended to be Snarky or wise a$$ish but reading it now it does sound that way. But still my point is there. So sorry if this offends anyone in advance.
    DeliriumTremens, Wasnex and wizard65 like this.
  20. Amano


    May 5, 2015
    Planet earth
    Yup thats what they do. Had the same. Besides its low output more like a 100 watt. Stay away. Dump the cursed thing.