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Author Topic: I could use a little more help  (Read 27241 times)
djroge1
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« on: August 29, 2009, 04:27:24 AM »
I'm stumped as to why I don't have good voltage readings on V1 and V2.

All the others are pretty much righ on par with where they are supposed to be.

Where wires L & M connect do any of you happen to know what that should be reading? I'm getting 52 - obviously I am getting 52 from L on the power board. Does that sound right?

Any thoughts?
« Last Edit: August 29, 2009, 05:24:43 AM by djroge1 » Logged
bluesfendermanblues
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« Reply #1 on: August 29, 2009, 05:31:07 AM »
No, I sounds absolutely wrong.

Turn of the power and check all wiring in your amp.

Use the 'layout' on the ceriatone webpage. If your amp is the latest overtone version, then use http://ceriatone.com/images/layoutPic/OvertoneLayout/Overtone-Special-V2.jpg

Check every single wire, one at the time.

It sounds like your have made an error in the PSU wiring, so check this part of the thorughly.

This is the best peice of advise I can provide you.
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djroge1
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« Reply #2 on: August 29, 2009, 05:50:33 AM »
I didn't think that sounded right.

I had an earlier post questioning my power tranny because the numbers and order were all off and I was confused.

Basically this is what my PT reads on the transformer when compared with the wire diagram.

In the wire diagram one side reads from left to right: 6-0-60-0-3.15-0-3.15-E
Mine reads from left to right: 3.15v-0-3.15v 230v-120v-100v-0- E

The other side of the wire diagram reads left to right: 240-220-120-0 - - 345-0-345
Mine reads left to right: 50v-0-6v-0-345v-0-345v
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hywelg
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« Reply #3 on: August 29, 2009, 06:17:22 AM »
Better if you were to provide a good photo of the innerds of your amp showing how you've connected the PT then we moght be able to help. The PT is pretty self explanatory, they might not be in the same order as on the layout but they are labeled and they are colour coded so that the '0' that goes with the 50v is the same colour so you can't confuse the pairing. So check your wiring to make sure that where the 60-0 pair go to on the layout drawing your 50-0 pair do also, an similarly for all the others.
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bluesfendermanblues
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« Reply #4 on: August 29, 2009, 08:10:16 AM »
Exactly, since the amp has the correct voltages on the output tubes and phaseinverter (v3), it doesn't sound likely that the powertransformer should be connected wrong.

More likely that you have wired the amp wrong.
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djroge1
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« Reply #5 on: August 29, 2009, 03:34:14 PM »
Ok here are some shots. It is possible that something is wrong since I am color deficient (not color blind), but when I couldn't figure out a color (red, green, brown) I had both my wife and kids help.
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hywelg
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« Reply #6 on: August 29, 2009, 05:29:17 PM »
Has this joint been soldered? Can't see it properly as the photos are a bit blurred.

* OTS.jpg (92.81 KB, 1024x768 - viewed 688 times.)
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djroge1
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« Reply #7 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.
« Last Edit: August 29, 2009, 08:09:45 PM by djroge1 » Logged
bluesfendermanblues
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« Reply #8 on: August 29, 2009, 09:11:57 PM »
Quote from: djroge1 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.

Try to solder it again!
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djroge1
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« Reply #9 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.
« Last Edit: August 29, 2009, 09:50:48 PM by djroge1 » Logged
hywelg
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« Reply #10 on: August 29, 2009, 10:04:39 PM »
So did the blue spark come from the place where you had your probe or somewhere else? Are there any signs of charring? Fuses? Transformer wiring continuity? ( you will have to de-solder the leads to check these, on the output side anyway)


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erwin_ve
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« Reply #11 on: August 29, 2009, 10:40:22 PM »
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?

Quote from: djroge1 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.
« Last Edit: August 29, 2009, 11:13:56 PM by erwin_ve » Logged
djroge1
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« Reply #12 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.
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djroge1
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« Reply #13 on: August 30, 2009, 03:25:10 AM »
Quote from: erwin_ve on August 29, 2009, 10:40:22 PM
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?

Quote from: djroge1 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.

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.
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bluesfendermanblues
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« Reply #14 on: August 30, 2009, 08:05:06 AM »
Quote from: djroge1 on August 30, 2009, 03:25:10 AM
Quote from: erwin_ve on August 29, 2009, 10:40:22 PM
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?

Quote from: djroge1 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.

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.

I know the frustration from my own building process, but your amp will get up and running, so don't worry too much about it.
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