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Topic: Traynor Mark Three Twin Reverb On/Off |
William W Western
From:
Canada
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Posted 2 Aug 2011 5:42 pm |
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| I inherited my son's amp with a possibly fused on/off toggle switch stuck on OFF. After bypassing it to see if it powered up I changed the switch. Worked great. But after about a week the new switch is on the fritz. Two wires go to the switch - one from the reset fuse and the other to the black wire of the power cord (on the aux power outlet). Switching to ON does nothing. Tapping it on OFF powers it up. I removed the newest switch and with the two wires in a marrett it powers up. I don't dare use it though under those circumstances. Anybody have any experience with something doing in an on/off toggle? |
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Michael Brebes
From:
Northridge CA
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Posted 3 Aug 2011 8:47 am
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That's some kind of mod that someone put in. I would remove it because it sounds very dangerous. I have a Mark 3 and it only has connections for Vibrato and Reverb on/off switches. Schematics are easily found online. If you have a problem, let me know and I will email you one.
_________________
Michael Brebes
Instrument/amp/ pickup repair
MSA D10 Classic/Rickenbacher B6/
Dickerson MOTS/Dobro D32 Hawaiian/
Goldtone Paul Beard Reso
Mesa Boogie Studio Pre/Hafler 3000
RP1/MPX100 |
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William W Western
From:
Canada
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Posted 3 Aug 2011 12:43 pm
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| Thanks, but this is the standard on/off toggle on the back panel. After you plug it in you turn this on, wait a few minutes, and turn the front toggle from standby to run as outlined in the owners manual. Just not sure why or how these could be burning out. |
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Ken Fox
From:
Nashville GA USA
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Posted 3 Aug 2011 4:34 pm
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Possibly a high in-rush and or operating current (possible bad power filters or other issues). Also possibly too low a current rating on the switch.
Tech time for sure!
schematic here:
http://www.lynx.bc.ca/~jc/761012_YGL3_3A.gif |
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William W Western
From:
Canada
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Posted 4 Aug 2011 4:40 am
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| Thanks all. I will have to now gather a work crew to help me carry it in to my local Traynor dealer. Ouch. |
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Michael Brebes
From:
Northridge CA
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Posted 4 Aug 2011 8:05 am
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I was confused by your title which made it seem like there was a reverb on/off switch. The switch on the back is a power on switch. The switch on the front is for Standby mode. Yes it sounds like the switch you installed is going bad. I would replace it with a good quality switch like a Carling.
_________________
Michael Brebes
Instrument/amp/ pickup repair
MSA D10 Classic/Rickenbacher B6/
Dickerson MOTS/Dobro D32 Hawaiian/
Goldtone Paul Beard Reso
Mesa Boogie Studio Pre/Hafler 3000
RP1/MPX100 |
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Ken Fox
From:
Nashville GA USA
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William W Western
From:
Canada
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Posted 4 Aug 2011 4:07 pm
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| The original stuck switch was a Carling 10A 125 VAC. I replaced it with a somewhat different Carling rated at 16A 125 VAC. Which lasted a week. I'll try another one. Thanks. |
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Ken Fox
From:
Nashville GA USA
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Posted 4 Aug 2011 4:24 pm
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I think you should do an AC current measurement on the line side, sounds like your amp is drawing way to much current from the line side and /or has a very high inrush current (which could be a result of power supply bad filter caps, etc)
You need to find and fix what is causing the problem. |
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William W Western
From:
Canada
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Posted 4 Aug 2011 7:29 pm
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| Thanks Ken. |
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Michael Brebes
From:
Northridge CA
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Posted 5 Aug 2011 7:11 am
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Those amps are from the early 70's. if the capacitors have never been replaced, it's definitely time.
_________________
Michael Brebes
Instrument/amp/ pickup repair
MSA D10 Classic/Rickenbacher B6/
Dickerson MOTS/Dobro D32 Hawaiian/
Goldtone Paul Beard Reso
Mesa Boogie Studio Pre/Hafler 3000
RP1/MPX100 |
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