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Author Topic: ots troubles  (Read 27891 times)
bluesfendermanblues
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« Reply #15 on: November 13, 2009, 03:44:26 PM »
Quote from: RiffRaff on November 13, 2009, 03:23:41 PM
Quote from: bluesfendermanblues on November 13, 2009, 12:01:35 PM
Just a quick thought - Could it be a fault with the send/return jacks??
try connecting the two with a jack patch cable

Ok I tried that and still nothing
on the voltage chart v4 and v5 pin1 shows 37 volts
mine are .026v and .039v
the rest are pretty close
would that be the set of (supposedly) matched tubes I bought off fleabay?
And what does HT stand for and where do I measure that?

Since, you have signal from the 'return' jack to speaker, don't waste your time on power tubes and the phase inverter  (v3 + V4 and V5) just yet.
So my suggestion would be to focus on the circuit from input jack to 'send' jack and nothing else.
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mcinku
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« Reply #16 on: November 13, 2009, 08:38:05 PM »
I agree,...
it looks like you should focus on V1 wiring.
Can you post some photos?

BTW can you hear relays clicking when you flip that switch?

Did you try if PAB works or jazz setting perhaps?

Just to cover all bases.
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RiffRaff
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« Reply #17 on: November 15, 2009, 03:47:09 AM »
I'll try and post pics in a new thread so it doesn't kill this one
« Last Edit: November 15, 2009, 03:57:35 AM by RiffRaff » Logged
RiffRaff
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« Reply #18 on: November 15, 2009, 04:04:18 AM »
Quote from: mcinku on November 13, 2009, 08:38:05 PM
I agree,...
it looks like you should focus on V1 wiring.
Can you post some photos?

BTW can you hear relays clicking when you flip that switch?

Did you try if PAB works or jazz setting perhaps?

Just to cover all bases.
Yes I can hear the relays clicking and yes I have tried all the settings and nothing
I'm trying to post some pics but it won't let me
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RiffRaff
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« Reply #19 on: November 15, 2009, 04:10:36 AM »
Quote from: bluesfendermanblues on November 13, 2009, 03:44:26 PM
Quote from: RiffRaff on November 13, 2009, 03:23:41 PM
Quote from: bluesfendermanblues on November 13, 2009, 12:01:35 PM
Just a quick thought - Could it be a fault with the send/return jacks??
try connecting the two with a jack patch cable

Ok I tried that and still nothing
on the voltage chart v4 and v5 pin1 shows 37 volts
mine are .026v and .039v
the rest are pretty close
would that be the set of (supposedly) matched tubes I bought off fleabay?
And what does HT stand for and where do I measure that?

Since, you have signal from the 'return' jack to speaker, don't waste your time on power tubes and the phase inverter  (v3 + V4 and V5) just yet.
So my suggestion would be to focus on the circuit from input jack to 'send' jack and nothing else.

Ok thanks, I will try and figure out the path on the layout if I can
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RiffRaff
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« Reply #20 on: November 15, 2009, 07:33:28 PM »
Quote from: tonym on November 12, 2009, 09:04:07 PM
Hi Tim,

This is not an HRM right? I know the amp is a bit different than the HRM, but I did a video including the problems I had. It might not actually tell you what your problem is, but you might get some pointers from the stuff I had videod at the time.

My problems revolved around basically the extra little boards (not the main boards). Nik talked about those extra boards being very picky about how much solder to use - too much and they form balls of solder which he said could distort the boards if overtightened and had caused trouble before. Funny thing was, that although my problem appeared to relate to one channel, it was actually there on everything - and when the output 'went off' it became VERY hard to find.

I checked all the connections on all those boards - in my case it did not make a difference, but Nik was very specific about that. All the same, I would check for too much solder, because he was so specific about that problem and the aggrevation it had caused before. Also slack off the non main boards from being too tight and see if the thing works.

Remember its not always wired wrong. In my build I did not have a single wire in the wrong place...

Nik also referred to bad dressing of cables - check that too.

My Power amp also worked perfectly - and I could even drive it with a pedal....  perfect - but the preamp was not.



Hi Tonym
Just watching your video's,in video #44 you mention the ground wiring is wrong
I have wired it just as it looks on the layout with the ground wire from the tip of the jack
is this wrong?
the ots is a bit different than the hrm and I don't quite understand what you mean
Do I have both jacks wired in reverse or just the ground wire?
Can you have a look at the layout for the ots and let me know?
Thanks
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tonym
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« Reply #21 on: November 15, 2009, 08:18:17 PM »
Hi Tim,

what I really meant was that if you look at the layout on the ceriatone website for the HRM, it can be interpreted two ways, looking at the back, or looking at the front of the jacks. I remember it was a bit weird at the time. If you watch further I think I said, ok thats right.. it  was just confusing to see the tip appearing to go to ground.

I removed both inputs from the chassis and checked them against the diagram where I could easily see and fix them.

I have copied what I did in a more viewable pic.

see attached

* Untitled-2.jpg (140.19 KB, 756x333 - viewed 687 times.)
« Last Edit: November 15, 2009, 08:19:48 PM by tonym » Logged
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RiffRaff
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« Reply #22 on: November 15, 2009, 08:33:03 PM »
Ok thanks
I got it right then
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RiffRaff
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« Reply #23 on: November 16, 2009, 03:10:57 AM »
Ok guy's I tried everything
Spent all day going over solder joints and checking wiring and still nothing
I did a continuity test from the tip of a chord in the input to ground just out of curiosity and it is continuous
Is this correct or do I have it wired wrong?
I have it wired just as it looks in the layout
All my voltages are good
so now I'm stumped
What would be the next step?
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hywelg
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« Reply #24 on: November 16, 2009, 11:40:26 AM »
I think you might have wired your relay switches incorrectly.

Compare yours with this http://www.ceriatone.com/images/completeAmpsPic/Overtone_100/b18B.jpg
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RiffRaff
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« Reply #25 on: November 16, 2009, 03:36:44 PM »
Can you have a look at the layout and confirm the the photo you showed is correct?
It doesn't make sense to me
Maybe there is some kind of mod on this amp?
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hywelg
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« Reply #26 on: November 16, 2009, 10:59:27 PM »
It appears thepwebsite photos don't match the layout. I've checked my layout and I built to an earlier version which is the same as the photos so I guess he didn't update the website photos when he changed the layout.

It seems yours is correct to the layout.
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RiffRaff
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« Reply #27 on: November 17, 2009, 06:16:41 AM »
Ok I unhooked two wires from the relay board and one from the star ground so I could have a look underneath the main board to see if there was a problem underneath
I found nothing wrong so I hooked everything back up
Now when I hit the power switch I get a low hum and v5 is red plating
What would cause this?
All wires were reconnected to there proper places
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bluesfendermanblues
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« Reply #28 on: November 17, 2009, 07:16:40 AM »
Quote from: RiffRaff on November 17, 2009, 06:16:41 AM
Ok I unhooked two wires from the relay board and one from the star ground so I could have a look underneath the main board to see if there was a problem underneath
I found nothing wrong so I hooked everything back up
Now when I hit the power switch I get a low hum and v5 is red plating
What would cause this?
All wires were reconnected to there proper places

a wrong bias setting (the Powertubes should read anything from 29mv - 35 mv)
and/ or a bad output tube.

Do you still have signal from the 'power amp in' jack?
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RiffRaff
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« Reply #29 on: November 17, 2009, 08:54:14 AM »
Found it, I pinched a wire between the standoff and mainboard
I built listening probe
(a pair of aligator clips, a 1/4" jack, a .047uF/400V (or more) cap and some wire. You connect a wire from an aligator clip to the ground connection on the jack, the cap to the other clip and the other side of the cap to the hot lead on the jack.)
then hooked that jack via 1/4" cable to another amp
Plugged in a tone generator to the OTS input and tried to trace the sound
but I could not get a signal from the tip of the input jack on the OTS
The listening probe worked fine when the tone generator was hooked directly to the aligator clips but not thru the input jack of the OTS
sssoooo unless I've wired the input jacks wrong which I've checked several times and even rewired again there must be a short to ground on the inputs
Is this correct?
I'm just guessing......remember I'm a newbie

Tim
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