Multiple amps again.

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by DamianP, Nov 15, 2004.


  1. DamianP

    DamianP Member

    Messages:
    5,790
    Joined:
    Aug 25, 2004
    Location:
    England.
    I understand the requirement for a proper amp switcher when connecting 2 amps to 1 cab if you want to switch between them, but what if you only wanted both amps on at once. Would there still be a problem with using a simple `Y` cable? Can anyone think of any problems I might encounter?

    Many thanks, Damian.
     
  2. aeolian

    aeolian Member

    Messages:
    6,083
    Joined:
    Apr 5, 2004
    Location:
    Santa Cruz, CA.
    Unless you have some really modern amp with only one input jack, running a cord from input 2 of one amp to input 1 of the next worked for Eric, Jimi, and a host of others back in the day.
     
  3. John Phillips

    John Phillips Member

    Messages:
    13,080
    Joined:
    Mar 17, 2002
    Location:
    Scotland
    Do you mean you still want to connect both amps to one cab, but just have them on at the same time?

    If so - you can't, period.

    You cannot connect the output sections of two amps together like that without frying something... one or both amps.

    The only way around it is if the cab has more than one speaker, and each speaker will take the power output of each amp, you could rewire the cab for stereo - effectively two separate cabs in the same box.


    If you do mean you want to just connect the inputs of both amps (each with a separate cab), you can do that with a Y lead, yes.
     
  4. DamianP

    DamianP Member

    Messages:
    5,790
    Joined:
    Aug 25, 2004
    Location:
    England.
    Thanks guys. Yes the idea was to connect the outputs together. I kind of thought it was a bad idea but was only 99% sure.
    It had occured to me that I could connect them to separate speakers within the same cab, but I think 2 cabs would be a better solution.
     
  5. aeolian

    aeolian Member

    Messages:
    6,083
    Joined:
    Apr 5, 2004
    Location:
    Santa Cruz, CA.
    Opps, missed the bit about one cab in my original reply.

    Doesn't someone make some sort of switching system that lets you run the other head into a dummy load while you're playing the first one? The idea had occured to me at various times but the reality of making something that would handle the power, switch fast enough, be reliable, and not send huge transients through an unterminated amp while switching on the fly, always sounded scary to me. Does this thing really work?

    This sounds more like an attempt to get more volume by ganging up on the speaker cabinet with two amps. Something similar to bridging a stereo amp. I suppose if you had two exact duplicate amps, you could rig up some sort of bridge arrangement, but keeping two tube amps operating consistently would be pretty tough.

    Cheapest way to more volume, more efficient speakers. There are plenty of choices out there right now at 99db/1W/1M and higher.
     
  6. DamianP

    DamianP Member

    Messages:
    5,790
    Joined:
    Aug 25, 2004
    Location:
    England.
    I was really just thinking aloud. I`m planning to build myself an amp and, as part of my research, have been looking at schematics. I came across a schematic for a double fender deluxe amp with an additional pair of output valves in series with the first. That got me thinking wether it would be possible to build an amp with 2 separate output sections which could be blended together ,which led to my question which related to connecting the outputs from separate output transformers.
    It looks as though I`ll have to dream up another crazy scheme. :)
     
  7. hasserl

    hasserl Member

    Messages:
    4,734
    Joined:
    Oct 24, 2004
    Location:
    So Cal
    Not really, you can still do this. But run each OT out to it's own speaker load. There are stereo amps after all!
     

Share This Page