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Main :: DT50/DT25



DT25/DT50 foot switch
by tin-soldier on 2013-03-01 15:00:13

I have both DT25 head/cab and DT50 combo, HD500, JTV 59 and JTV 69. Having used this setup for a while I decided to dispense with the HD500 and use a regular pedalboard for a while. I've got a Marshall two button foot switch with led"s and while the led is fine for the channel switching on the DT25, the reverb only works with the led off for some reason. I appreciate that the DT50 only supports channel switching but I don't understand the problem with the reverb button led when using it with the DT25.  Anybody have an explanation?



Re: DT25/DT50 foot switch
by spaceatl on 2013-03-01 15:17:35

circuit closed = reverb off...circuit open = reverb on....The reverb is digital...the switch my be FET of some sort...whatever the state switching logic is for reverb, it isn't going to be like a conventional amp reverb tank switch...like anything it depends if the closed voltage hold the circuit open or closed and what that meaning is...I noticed that with an old crate switch when I used my DT25 with it...Obviously, the switch logic is backwards to the led...not really all that uncommon...



Re: DT25/DT50 foot switch
by tin-soldier on 2013-03-01 15:28:05

are you saying that the channel B selection is the closed state and so the led lights but the reverb works the other way around?  Does that mean that there is no technical solution?



Re: DT25/DT50 foot switch
by spaceatl on 2013-03-01 19:51:22

I guess...hard to say without opening up the FS and checking a couple of things with a voltmeter...then you would know...anything I tell you is a guess...but it certainly so seem like the reverb might be inverse logic...could be a voltage threshold thing...My best guess is the DT25 reverb is inverse logic...If you had an old school FS without leds then it doesn't really matter what the logic is...



Re: DT25/DT50 foot switch
by tin-soldier on 2013-03-01 23:26:35

Thanks, I suppose the answer is to install a 9v battery but I can live with reverb being on with the led off.




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