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16  Ceriatone / Overtone / Re: I could use a little more help on: September 02, 2009, 12:48:24 AM
I plugged a cord into the Power Amp In and it appears to be working. Now, I'm going to re-check all of my work up to the points you suggest.


You should now be getting some sound out of it, the voltages are in the right region, though a little low on V1 and V2, though I wouldn't worry about that for now.

Try pluging a lead in to the Power Amp IN socket just to see if the poweramp section is working properly (touch the tip of the other end of the lead). If you do then plug in normally and if you get nothing from either clean or OD then check and re-check your wiring  from input jack up to V3 pin 2 and 7. This is the point at which its helpful to have both the schematic and the layout to guide you whilst checking, but you can do this with just the layout checking every joint that you have made whilst marking them off with a highlighter pen. Any join that looks suspect re-do it.

You have wired your input jacks the right way haven't you?? Wink Have you tried the FET input?
17  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 08:47:02 PM
Ooops yes pin 2.


I do the power amp In test and recheck my wiring tonight when I get home.

I already checked for continuity from input to V1 pin one and it looks good for both input and FET input. I plugged in a cable and read it from cable to pin one.

Pin one?? you mean pin 2, right?
18  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 07:35:36 PM
I do the power amp In test and recheck my wiring tonight when I get home.

I already checked for continuity from input to V1 pin one and it looks good for both input and FET input. I plugged in a cable and read it from cable to pin one.
19  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 01:52:34 PM
I took a quick reading of those previous 10 points and here they are in order - I didn't wait for the amp to really warm up because I'm on my way out the door for work.

455
454
429
318
319
312
174
188
174
191
20  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 04:25:49 AM
Still no sound from the input jack but the voltages are looking better. I hear a hum and I get a crackle when measuring V3.

V1:
Pin 1 - 152
pin 3 - 1.6
pin 6 - 172
pin 8 - 1.5

V2:
Pin 1 - 164
pin 3 - 1.8
pin 6 - 182
pin 8 - 1.5

V3:
Pin 1 - 285
pin 3 - 59
pin 6 - 273
pin 8 - 59

V4:
pin 3 - 450
pin 4 - 449
pin 5 - 37
pin 6 - 450

V5:
pin 3 - 450
pin 4 - 449
pin 5 - 37
pin 6 - 451
21  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 03:58:14 AM
What about that 22uF 450V electrolytic cap on the wall near the first tube - shouldn't that be the other way around?

Compare it to this photo from the Ceriatone web site:

http://www.ceriatone.com/images/completeAmpsPic/CTOvertone/board/Leftend2B.jpg

Phil

Bingo! I bet that is a major problem and I don't have to look at your link I see it in the wire diagram.  Huh?  Shocked  Angry Embarrassed  Embarrassed  Embarrassed I can't believe I missed that. I'm going to turn that around and I'll post the results. Thanks.
22  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 12:46:33 AM
OK here are those voltages

1. 437
2. 439
3. 379
4. 53
5. 53
6. 19
7. 10
8. 14
9. 33
10 37
23  Ceriatone / Overtone / Re: I could use a little more help on: August 31, 2009, 10:18:58 PM
I'll check those and post as soon as I get home from work. Thanks.
24  Ceriatone / Overtone / Re: I could use a little more help on: August 31, 2009, 03:18:27 AM
Ok! Did you measure the 22k resistor(is it really 22k with amp off)?(at the power supply dropping string)

It reads 20.6
25  Ceriatone / Overtone / Re: I could use a little more help on: August 30, 2009, 08:49:41 PM
Well you're right I should learn more. This is the 2nd amp I've built, the first was a single ended class A amp with one 12AX7, one 6L6, and one rectifier tube built and it wasn't a kit. But I'm learning now as I build.

Well sorry if I was a bit grumpy Embarrassed
But it's easier to help you out if we both talk the same language...

Maybe a good link is: http://www.valvewizard.co.uk
It sure helped me a lot to understand how tubes work.
http://en.wikipedia.org/wiki/12AX7 on the pin layout of a 12ax7.

I also did understand more of the schematics when somebody told me that a 12ax7 tube does have 2 triodes which appear apart from each other in a schematic(dUHH).

Maybe you already know this stuff, maybe others will benefit from it:
Plate is where the high voltage is. Pin1 and 6 on a 12ax7.
Grid is where the signal is coming in. Pin 2 and 7 on a 12ax7
Cathode is where current flows to plate when a incoming signal is applied at the grid. pin 3 and 8 on a 12ax7.


I know some of the language, but obviously not enough. I'll check out those web sites. I have read The Guitar Amp Handbook by Dave Hunter and Dave Funk's Tube amp Workbook. Both have a lot of info, but perhaps I just didn't retain nearly enough.

Anyway, I have a new fuse in and all of the V readings are about where they were before.
26  Ceriatone / Overtone / Re: I could use a little more help on: August 30, 2009, 07:31:09 PM
Well you're right I should learn more. This is the 2nd amp I've built, the first was a single ended class A amp with one 12AX7, one 6L6, and one rectifier tube built and it wasn't a kit. But I'm learning now as I build.
27  Ceriatone / Overtone / Re: I could use a little more help on: August 30, 2009, 03:25:10 AM
441v on your Phase Inverter cathode is bad stuff, thats normally a voltage reading for the plates at the powertubes.
* make sure your  tube at v3 is OK, replace it, check fuses(measure them)
*Is your wiring at the dropping string correct?
*Check with amp off: the resitance between the 110k PI resistor to V3 pin 3, the resistance between 100k PI resistor to v3 pin 3.
*What is the resistance of the  -supposed to be- 22k resistor in the dropping string, please measure it(with amp off, of course).
*Is your Output Transformer ok?: measure resistance between a primary lead and a secondary lead(amp off).
*Check your wiring for the presence control;is it accidently on the primary side of the Output Tranny?

I re-soldered that point and it remained the same.

New problem... I was checking voltages in some other locations to see if they were the same

V1 pin 1 - 10
V2 pin 2 - 30
V3 Pin 3 441... then suddenly there was a blue spark and the volts dropped down to 60.  Cry

I think something broke... (blew up) because now it's completely dead and there is no reading.

Any suggestions on where to buy a new transformer that will work? I live in the states.

I made a mistake in giving you information. the 441v was on V4 NOT V3.
The spark was where I had my probe. I think I may have made an arc - like when you weld to get the weld started?
The only charring I've found so far is on the fuse and there was no smoke or burning smell when it sparked.
I'm not sure which one is the 110k PI resistor to V3 pin 3 - I know where that pin is, but I don't see a 110k or 100k resistor.
As for the PT and measuring... I putting one lead on the 120v (on/off switch) and tried reading on the rectifier board - nothing. I tried again on the switch relay board - nothing.

It's late and I'm tired and I need to think with a clear head tomorrow.
28  Ceriatone / Overtone / Re: I could use a little more help on: August 30, 2009, 01:43:13 AM
Ok after that spark I had to leave and go work out... frustration.

The HT fuse .5a fast blow is out and I don't have another one right now so I'll hit the store tomorrow.

I'll measure and look at all the suggestions in a bit.

Thank you guys for the encouragment and help... I know I can get thru this.
29  Ceriatone / Overtone / Re: I could use a little more help on: August 29, 2009, 09:46:18 PM
I re-soldered that point and it remained the same.

New problem... I was checking voltages in some other locations to see if they were the same

V1 pin 1 - 10
V2 pin 2 - 30
V3 Pin 3 441... then suddenly there was a blue spark and the volts dropped down to 60.  Cry

I think something broke... (blew up) because now it's completely dead and there is no reading.

Any suggestions on where to buy a new transformer that will work? I live in the states.
30  Ceriatone / Overtone / Re: I could use a little more help on: August 29, 2009, 08:06:23 PM
Yes that spot has been soldered.

In fact, it is the connection just before that spot with the 22k 2w where I loose voltage. On the side towards the PT that connection reads 386. on the other side of that it reads 54 and is low from there on out going on to the L & M connection point.
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