Results 1 to 5 of 5

Thread: Peavey GPS 1500

  1. #1
    Member PfeifferElectronics's Avatar
    Join Date
    Oct 2010
    Location
    TILLAMOOK, OR
    Posts
    71
    Thumbs Up/Down
    Received: 2/0
    Given: 0/0
    Rep Power
    9

    Peavey GPS 1500

    I have a GPS 1500 pa amp that isn't producing the amplitude that I would expect. I probed the outputs for DC and found none. However, I was shocked..(literally) when I touched the heat-sink. I was surprised to find 88VDC on both heat-sinks to the ac ground at the 120VAC input. Is there supposed to be voltage on the heat sinks? I wouldn't think so but I'm not an expert by any means. Any help would be appreciated. If this voltage is bad, I would think I need to replace all the amplifier transistors. Thoughts?

    Thanks

    0 Not allowed! Not allowed!
    ---------------------------
    VOLUME 4 U

  2. #2
    Master Destroyer nosaj's Avatar
    Join Date
    Sep 2011
    Location
    Pace, FL
    Posts
    3,116
    Thumbs Up/Down
    Received: 1,020/100
    Given: 141/35
    Rep Power
    11
    Quote Originally Posted by PfeifferElectronics View Post
    I have a GPS 1500 pa amp that isn't producing the amplitude that I would expect. I probed the outputs for DC and found none. However, I was shocked..(literally) when I touched the heat-sink. I was surprised to find 88VDC on both heat-sinks to the ac ground at the 120VAC input. Is there supposed to be voltage on the heat sinks? I wouldn't think so but I'm not an expert by any means. Any help would be appreciated. If this voltage is bad, I would think I need to replace all the amplifier transistors. Thoughts?

    Thanks
    Hell yea those heatsinks are hot.
    So first off schematic contact Peavey to get a schematic.
    Do you have a signal generator? These amps really need something with a preamp to drive them. I used to use a Drum machine plugged into the power amp and a dummy load plugged into the power amp. Then measure the AC voltage on the dummy load.

    nosaj

    PS. what you expect could have something to do with the input or the output(speakers ohms)

    0 Not allowed! Not allowed!
    Binkie McFartnuggets‏:If we really wanted to know the meaning of life we would have fed Stephen Hawking shrooms a long time ago.

  3. #3
    Old Timer J M Fahey's Avatar
    Join Date
    Oct 2007
    Location
    Buenos Aires, Argentina
    Posts
    11,573
    Thumbs Up/Down
    Received: 1,733/18
    Given: 1,333/29
    Rep Power
    26
    Half the current threads are about "putting out less that expected" but nobody offer *numbers* to qualify that subjective statement.

    So: what do you expect (in V RMS) and what are you getting (again in V RMS) ... all into a proper load of course.

    What are you driving it with? Again in V RMS.

    0 Not allowed! Not allowed!
    Juan Manuel Fahey

  4. #4
    Lifetime Member Enzo's Avatar
    Join Date
    May 2006
    Location
    Lansing, Michigan, USA
    Posts
    31,720
    Thumbs Up/Down
    Received: 1,602/7
    Given: 0/0
    Rep Power
    54
    Most Peavey amps print the output voltage next to the output watts by the speaker connections. SO there should be little confusion as to what the amp should produce. I think 68v into 4 ohm on your model, for example.

    0 Not allowed! Not allowed!
    Education is what you're left with after you have forgotten what you have learned.

  5. #5
    Supporting Member Jazz P Bass's Avatar
    Join Date
    Dec 2008
    Location
    Wernersville, PA
    Posts
    12,828
    Thumbs Up/Down
    Received: 451/2
    Given: 237/0
    Rep Power
    25
    Here is the spec sheel on the Peavey GPS series of amplifiers.

    peavey_gps900_1500_2600_3500_specs.pdf

    The GPS 1500 has an input sensitivity of 1.12Vac.
    That is the signal amplitude required to drive the amplifier to full power.

    (A guitar by itself will typically output 0.100 Vac)

    0 Not allowed! Not allowed!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Peavey 900 - 1500 schematic
    By Tubebass in forum Music Electronics
    Replies: 0
    Last Post: 06-04-2018, 07:21 PM
  2. Gregory Reverb 1500?
    By Rhodesplyr in forum Vintage Amps
    Replies: 2
    Last Post: 07-23-2015, 03:27 PM
  3. MXR 1500 (190) Schematics
    By gomez63 in forum Schematic Requests
    Replies: 2
    Last Post: 06-02-2010, 04:38 PM
  4. Gregory Reverb 1500?
    By Rhodesplyr in forum Schematic Requests
    Replies: 1
    Last Post: 04-07-2010, 03:23 AM
  5. Ampeg SVP-1500 Protecting
    By coreyleeitc in forum Maintenance, Troubleshooting & Repair
    Replies: 5
    Last Post: 03-31-2009, 12:24 AM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •