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Turning ON/OFF switches' sequence (Read 5278 times)
Fireblade
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Turning ON/OFF switches' sequence
05/23/12 at 15:00:38
 
Hi!  I need to know the optimal switching sequence when Turning On and OFF the Mini Torii.  Last night I turned OFF the ones in front first and heard a 'thump' even though the volume pods were at the zero position.

The Mini has switches for the transformers and input voltage regulation (1 ea., on both sides), and in the front for each channel, plus the tone control toggle switch.  There must be an optimal sequence to turning the amp ON and OFF.  I don't want to risk damaging something.

Thanks for any information.

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« Last Edit: 05/23/12 at 22:25:46 by Fireblade »  

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Fireblade
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Re: Turning ON/OFF switches' sequence
Reply #1 - 05/23/12 at 18:02:55
 
Any suggestions, anyone?
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Lon
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Re: Turning ON/OFF switches' sequence
Reply #2 - 05/23/12 at 18:10:04
 
I don't have a MT as you know. Is there not a main power supply on and off switch? If so there should be no harm in using that one. You won't have to turn the tone control on and off. . just leave that however it it is set for powering the unit on or off.
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Fireblade
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Re: Turning ON/OFF switches' sequence
Reply #3 - 05/23/12 at 18:20:21
 
No, it does not.  There are all these switches, no main one that I can see.  I'm not worried about the tone control, I just do not want to have schock waves hitting the speakers or amp due to a sub-optimal switching sequence.  The manual doesn't show this either.

I could leave everything ON, and simply use the main powering switch from my isolation transformer. Yet, I'm not sure this is advisable either.  What would happen with someone not using an isolation transformer or a dedicated Mains circuit in that case?

I think if I kill the switches on the back side first (transformers I believe), there's no thump.  There's a thump when I do the opposite (turning off the ones in front for each channel first, in a reverse sequence).  From the little I know about tube amps, some components should be energized before others, to avoid some kind of accumulated energy jump or something.  This may explain the design need for having 3 switches per side (not counting the tone control).

Let's see if someone else with a M-T has some clues.  Thanks, Lon.
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« Last Edit: 05/23/12 at 18:24:58 by Fireblade »  

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ZYGI
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Re: Turning ON/OFF switches' sequence
Reply #4 - 05/23/12 at 21:22:19
 
Although I have a Mini-T, it seems its not the same as everyone else's Mini-T

On my unit, there are switches on the back to turn the voltage regulator tubes,  for I believe the input tubes, on and off, or in and out of the circuit, however you want to look at it.

FB don't you turn your Mini-T on and off with the volume controls? That is how mine is. The thump I get is the OA3's are de-energized. Your not going to hurt the speaker from the thump you hear from turning off the amp.

What you've heard about gear needing to be turning on/off in any particular order is when using a tubed pre-amp with a power amp, you want to turn the pre on first, let it stabilize, then the amp. The reverse is the proper way to turn off, amp first, then the pre.

The reason I know its the OA3 making the popping sound is only one channel pops, so I flip the tube from one channel to the other and the pop followed the tube. I have others here, just never bothered to switch them out as I wasn't concerned with the popping.
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ZYGI
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Re: Turning ON/OFF switches' sequence
Reply #5 - 05/23/12 at 21:23:35
 
By the way, is there a owners manual on line for the Mini-T?

I looked, couldn't find one....I have to admit I didn't give it much effort!
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Fireblade
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Re: Turning ON/OFF switches' sequence
Reply #6 - 05/23/12 at 22:19:01
 
Hey Zygi,

Here's the link for the manual:

http://www.decware.com/newsite/Minitoriimanual.pdf

I know now if I turn the amp OFF by starting from the back, horizontally (i.e., both channels in the outermost row, before going to the next row of switches going forward), I don't hear a thing.  This is how I'm doing it since I heard the thump.  I use this same sequence to turn it on.  In both cases I make sure the volume pods are at the cero position.

In my unit, each channel's volume is not a switch, just volume pods.   You can isolate use of one channel by just not turning on the switches (3) on either side.

My question now is if it is ok to do it this way or to use the isolation transformer power switch and turn everything ON or OFF that way (all 6 switches would stay always in the ON position, of course).

This may sound trivial to most of you, and I apologize, but I want to make sure I don't screw up something inadvertently, as I know nothing about this amp.  In my earlier tube system (back in the day), each monoblock (225 Deluxe VTL) had a power switch controlling all tubes in that block.  I would turn the preamp on first and off last, as you said.  The only difference is my pre was SS at the time (ARC LS-3).

I know a pair of those switches are toggle switches to bypass the input tube voltage regulation stage.  I suppose another pair (closer to the transformers) would kill the transformers.  I'm not sure what the 3rd pair of switches (at the very front) do, exactly.  

Thanks for your inputs.
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« Last Edit: 05/23/12 at 22:28:33 by Fireblade »  

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HPDJ
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Re: Turning ON/OFF switches' sequence
Reply #7 - 05/23/12 at 22:47:28
 
Hey Fireblade,

I believe the two switches on the front are to switch between sources connected to the two inputs on the back of the unit...I used to think it was some sort of standby switch because when I flicked it off I heard no music, but that's because I only have one source connected to it..

I have a headphone mod on my MT and those switches are to the far left and right on the back. When I switch those (headphone) switches on, my speakers are cancelled and the headphone input (on the front of my unit) is engaged. I haven't messed with the tube regulation switches yet. I just leave them on...

I do hear a little "thump" when I turn the MT on...it happens just as the OA3 and OC2 tube regulators "pop" to life. The thump doesn't bother me at all and I don't think it's doing any harm to my system so...

Anyway I'm probably not really answering your question so I hope the others chime in once they can Smiley
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Fireblade
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Re: Turning ON/OFF switches' sequence
Reply #8 - 05/24/12 at 00:41:49
 
Hey HPDJ,

Thanks for reminding me about the input selection switches up front (I only have one input myself, so I had just forgotten about the 2nd pair of inputs available  :) )

I see what you mean and I probably agree.  Besides, when I follow the described sequence, it does not thump at all and I just feel better because of it.  Therefore, in conclusion DuHHHHH!!, the switches right next to the trannies are literally the power switches, as everything else is optional (input regulation, input selection and tone control).

Thanks for your inputs.
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HPDJ
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Re: Turning ON/OFF switches' sequence
Reply #9 - 05/24/12 at 02:35:57
 
Heyyyy that's cool, glad I could help somehow Cheesy

I was slightly embarrassed when I finally called Steve to ask about what some of the switches were for haha...I thought I could figure it out on my own, but then I was a little confused. Glad to see that it wasn't just me Smiley He of course cleared that up for me in 2 seconds.

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Rivieraranch
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Re: Turning ON/OFF switches' sequence
Reply #10 - 05/24/12 at 13:16:46
 
You could just pull the plug, too?
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Fireblade
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Re: Turning ON/OFF switches' sequence
Reply #11 - 05/25/12 at 01:05:58
 
It turns out the switches up front are not for input selection but control the volume pods.  I guess the inputs are directly connected and the signal coming through either pair is processed accordingly.

The amp is sounding better all the time!
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HPDJ
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Re: Turning ON/OFF switches' sequence
Reply #12 - 05/25/12 at 07:39:26
 
^^

This confuses me...I don't think this is the case with my MT. They are definitely input selectors on mine..
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Fireblade
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Re: Turning ON/OFF switches' sequence
Reply #13 - 05/25/12 at 12:16:39
 
Well, the way I found out is I turned one of the switches off while playing, and that side's volume went off.  If it was a selector, either volume would have remained on both channels or both channels would have been off.  Not the case.  Funny!

The switching setup in my M-T is fine with me, mind you.  I just wanted to know the value added on those individual switches.
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« Last Edit: 05/25/12 at 12:52:18 by Fireblade »  

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HPDJ
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Re: Turning ON/OFF switches' sequence
Reply #14 - 05/26/12 at 00:04:56
 
OK I see Smiley

With my MT, when I have only one source connected to one set of inputs in the back, when I flick ONE of the front switches off, the music on that channel is silenced because I have nothing connected to the unused input on that same channel. If I did, and that source was playing music, then I would have two different sources playing at the same time. One on each channel.

So sometimes I have my computer connected to the MT via the headphone jack on my laptop and some RCA's to the back of the MT, AND I have either my CD player or TT connected to the other remaining inputs. I'll flick BOTH switches on the front off and get either the music/video audio I'm watching online, OR I'll keep the switches where they are and get the music from my TT/CD player. I have nothing connected to the output's yet Smiley

Don't forget this is a dual mono amp Cheesy
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« Last Edit: 05/26/12 at 00:08:27 by HPDJ »  
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