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Author Topic: Ceriatone Tweaked  (Read 17579 times)
mcinku
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« Reply #15 on: April 29, 2008, 07:43:48 AM »
As far as I know Nik uses CAD.
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hywelg
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« Reply #16 on: April 29, 2008, 08:13:53 AM »
I think Nik is a little reluctant to let anyone get their hands on the original files. When I asked for a .dwg or .dxf so I could print a large version he was a little cagey as to what software he used.
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kenster
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« Reply #17 on: April 29, 2008, 02:32:31 PM »
Hey Jack -

Awesome. Yes, when you have time to work it, I believe it would be a real help to many of us here that are a little overwhelmed by a layout or a schematic.

BTW, is there a concern for getting zapped while doing some of these mods? I've heard where if you have the amp off and then flip the standby on, the major current reserves are drained. Is that true? I'd like to avoid getting a nasty surprise while in the unit snipping and soldering away!!

Thanks!
Ken
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poipounder57
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« Reply #18 on: April 30, 2008, 08:43:35 AM »
Hi kenster...I'm a newbie to electronics and I'm planning on performing the modification to my Overtone.  I'm doing a lot of reading on discharging caps...the caps can store enough voltage to kill you.  So we do need to be very careful when poking around in the amp.
Here's some info that I found....

http://studentweb.eku.edu/justin_holton/caps.html

http://www.schematicheaven.com/mods/capdischarge.htm 

Good luck!!!
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kenster
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« Reply #19 on: April 30, 2008, 02:27:00 PM »
Hey poipounder57,

Thanks for those links. That makes me want to think twice about just jumping in and doing this so quickly. How effective is it to flip the standby on while the power is off in the OTS? Even Nik says that's all you have to do. Jack, do you have anything to add to this discussion? What procedure do you use to get the charges out of the chassis before you work on it?

Cheers -
Ken
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hywelg
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« Reply #20 on: April 30, 2008, 03:56:33 PM »
My amp tech told me that if when you turn off, you turn the standby off then count to ten before switching the mains off that should do it. But to be on the safe side get your meter out and see what voltage you've got on the big filter caps.
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mcinku
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« Reply #21 on: April 30, 2008, 06:24:48 PM »
I just measured the voltage across the big caps and I noticed something interesting.
When I switch off the amp ( and it doesn't matter if the off switch goes first and the standby after one minute )... somehow the caps gets discharged, no action needed.
I don't know why or how... maybe it's the design of the amp.


...but don't take my word on this, please measure the voltage yourself.
 Huh?
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kenster
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« Reply #22 on: April 30, 2008, 07:43:17 PM »
What Nik has been telling me. You made a case for switching the standby off last ( a minute should be ample time to discharge capacitors) doing as it's intended to do.

That makes me feel much more comfortable.

Thx!
Ken
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mcinku
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« Reply #23 on: April 30, 2008, 07:56:03 PM »
Yes, but I'm trying to say that even if you switch off both switches at the same time the caps still gets discharged.

 Huh?
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kenster
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« Reply #24 on: April 30, 2008, 10:27:03 PM »
mcinku -

Yes, I understood and I should have worded things a bit differently. My bad....

It may well be in the basic design to drain the current regardless of which way you switch the power off. I'd err on the side of switching the standby off last just to be smart. I've done that on amps in the past - leaving the standby on while switching the power off - and you can actually hear what sounds like current draining off thru the speakers.

Your test validated that and combined with what Nik is saying, I'm ready to jump in this weekend.  Grin

Cheers!
Ken
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mcinku
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« Reply #25 on: May 01, 2008, 08:09:19 AM »
But be warned... this may be the case with OTS but don't think it's the same with other amps.
I just have to say this, for any other guy who might be reading this.


BTW as far as I know, when you leave the standby switch on and you are listening to the volume which is fading... This is not necessarily the draining caps thing but it could be also the 6L6 (or any other power tube) heater is getting colder. So if the heaters get colder before the caps gets drained... you could still have the charge in there.
 Wink
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