Quick question

Andrew Edstrom
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Quick question

« on: October 05, 2008, 03:57:14 PM »

This is a little curious:

Almost finished with amp build, but just noticed the PAB/OD Manual/Pedal switches' wiring diagram on the layout is the mirror image of the pictures of the same part of the amp from the ceriatone site. I haven't had this problem with any other parts of the layout so far.

So my question is, Which is right? It's my first instinct to go with the layout, but the pictures are of a working amp, so there might've been a reason for that too.

Thanks,

-Andrew


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Andrew Edstrom
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Posts: 8

Re: Quick question

« Reply #1 on: October 06, 2008, 02:34:45 AM »

I powered up and the amp is partly working. All 5 tubes glow on standby and operate. I don't get any sound with a guitar connected to the main input. I do get sound if I connect to the effects loop return. I am out of time for the day but plan to ring it out tomorrow.

Does anyone have suggestions on what to look for or a good approach to start-up trouble shooting these symptoms.?


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nickm57
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Re: Quick question

« Reply #2 on: October 06, 2008, 12:48:00 PM »

try this link not the same but helpful,

http://thenormster.com/DumbleLite/BuildersGuide/D-Lite%20Assembly%20Guide.htm

I'd look at the voltages on the pre-amp and check the relay and tone switches, they took me a while to figure, when I built my amp.

With the channel switching, I can't remember what I did but the reversed thing caused concern. The way I did it worked.....
Nick


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Andrew Edstrom
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Re: Quick question

« Reply #3 on: October 06, 2008, 01:32:41 PM »

Thanks, I will check out that link!

I did ring out the amp wiring this morning but didn't find any mistakes or issues. I still get no sound from the amp at all unless I plug into the effects return jack. Here is what I am observing.

1. The amp is silent now matter how much I turn up any control
2. The position of the switches on the front panel make no difference
3. I have a power indicator light
4. All the tubes glow on standby and operate
5. The power amp is working when plugged into the effects return jack
6. The foot switch lights operate
7. Standby works correctly... the power amp mutes when standby is activated
8. There is no hum buzz or other noises.
9. There is also no sound when plugged into the FET input

So that's where I'm at right now. Any suggestions would be greatly appreciated!


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Andrew Edstrom
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Re: Quick question

« Reply #4 on: October 06, 2008, 06:15:13 PM »

It works now!

I measured the plate voltage at on the preamp tubes and was getting 0v. I traced that to a wiring error on the cap for the FET pre-amp. I had used the center lug and that one is grounded directly to the chassis. I moved it over and the amp came to life!

Sounds awesome. I did a quick run through of the controls and I think it is pretty my functional. It sounds sweet!


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tele caster
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Posts: 28

Re: Quick question

« Reply #5 on: October 06, 2008, 10:25:06 PM »

Congrats and well done , it's a good feeling when you figure it out yourself.


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