Ceriatone Dizzy 30

[Diablo1]

On the layout you did... do you have 2 wires connected to pin 2 one going to the front center tab the other going to back center tab on the MV pot?? that's the way I hooked it up.

NO.
2 wires are connected to pin 2.
One goes to the front center tab of the MV pot.
The other goes from pin 2 to the junction of the 1.5K grid resistors which connect to one pair of EL84 tubes.
I used pin 2 on the board as a junction point, but you really don't have to use it. You can connect a lead straight from the front center tab of the MV to the junction of the 1.5K grid resistors on one pair of EL84 tubes. Then pin 2 will have nothing connected to it.

The rear center tab of the MV pot has a lead straight to the junction of the 1.5K grid resistors for the other pair of EL84 tubes. The 1.5K grid resistors connect to "pin 2 on the EL84 tube sockets" - not pin 2 on the turret board.

Another potential problem - Pin 4 on the turret board originally had a wire connecting to one pair of 1.5K grid resistors for the EL84s. You need to disconnect that wire.

[playonit]

On the layout you did... do you have 2 wires connected to pin 2 one going to the front center tab the other going to back center tab on the MV pot?? that's the way I hooked it up.

NO.
2 wires are connected to pin 2.
One goes to the front center tab of the MV pot.
The other goes from pin 2 to the junction of the 1.5K grid resistors which connect to one pair of EL84 tubes.
I used pin 2 on the board as a junction point, but you really don't have to use it. You can connect a lead straight from the front center tab of the MV to the junction of the 1.5K grid resistors on one pair of EL84 tubes. Then pin 2 will have nothing connected to it.

The rear center tab of the MV pot has a lead straight to the junction of the 1.5K grid resistors for the other pair of EL84 tubes. The 1.5K grid resistors connect to "pin 2 on the EL84 tube sockets" - not pin 2 on the turret board.

Another potential problem - Pin 4 on the turret board originally had a wire connecting to one pair of 1.5K grid resistors for the EL84s. You need to disconnect that wire.

Cool.... We should see a much different result when I fix this tomorrow ... I got confused on all the pin 2's there... after looking back at your layout I see now how it corresponds to pin 2 on the el84's...

Thanks for the help on this.. I will let you know how it goes tomorrow..

[Diablo1]

Playonit says;

"Cool.... We should see a much different result when I fix this tomorrow ... I got confused on all the pin 2's there... after looking back at your layout I see now how it corresponds to pin 2 on the el84's...

Thanks for the help on this.. I will let you know how it goes tomorrow."

You're right....too many pin 2s made it confusing. I bet it works fine tomorrow after you do a little fixin'.

[playonit]

Playonit says;

"Cool.... We should see a much different result when I fix this tomorrow ... I got confused on all the pin 2's there... after looking back at your layout I see now how it corresponds to pin 2 on the el84's...

Thanks for the help on this.. I will let you know how it goes tomorrow."

You're right....too many pin 2s made it confusing. I bet it works fine tomorrow after you do a little fixin'.

Well this has got weirder.. I went from overdrive to no drive.. followed the layout after your clarification I am not getting any sound now..

Took 1.5k grids from junction at the sockets to center pins front and back on the MV..

Disconnected original wire from 1.5k junction to pin 4 on board..

heres a couple of images of what I did..

I have missed something.. I just don't know what

[Diablo1]

Nice photos and annotation. It looks correct as far as following my layout. Check the resistance of all those new solder joints to make sure you have continuity where you should and nothing is grounded out where it shouldn't be. It's hard to tell, but is the right side of the front 2.2M resistor on the MV pot touching the middle tab to the right tab? Also, is pin 3 on the board connected to ground? It should be. Something else I see - your two resistors on the MV pot aren't 2.2M. They appear to be 220K!
2.2M are red / red / green.

[playonit]

Nice photos and annotation. It looks correct as far as following my layout. Check the resistance of all those new solder joints to make sure you have continuity where you should and nothing is grounded out where it shouldn't be. It's hard to tell, but is the right side of the front 2.2M resistor on the MV pot touching the middle tab to the right tab? Also, is pin 3 on the board connected to ground? It should be. Something else I see - your two resistors on the MV pot aren't 2.2M. They appear to be 220K!
2.2M are red / red / green.

I have continuity.. the resistors are 2.2m.. the center pin is not hitting the pin to right... pin 3 connects to the under board ground wire that shows on the layout. under board ground wire goes to pin 3.. pin 3 goes to MV pot .. it doesn't complete the ground from looking at it? should there be another wire going from pin 3 to the star ground?? I tried that and it didn't get me sound though.. I check under board wires from preamp to board for continuity and all checks out there..

[Diablo1]

[.

I have continuity.. the resistors are 2.2m.. the center pin is not hitting the pin to right. should there be another wire going from pin 3 to the star ground?? I tried that and it didn't help..[/quote]

Pin 3 on the board should be wired exactly like the Ceriatone layout, except it will be missing the two 220K resistors. Pin 3 is connected to the star ground and also to other board pins to the right to provide their ground path. Also Pin 3 will connect to the MV pot - front and rear left tabs - that's the ground path for the MV.

Make sure something else that you connected isn't grounding out the signal. You did try turning the master volume in both directions?

What is the color code on your 2.2M resistors? In the photo it looks red/red/yellow.

[playonit]

[.

I have continuity.. the resistors are 2.2m.. the center pin is not hitting the pin to right. should there be another wire going from pin 3 to the star ground?? I tried that and it didn't help..

Pin 3 on the board should be wired exactly like the Ceriatone layout, except it will be missing the two 220K resistors. Pin 3 is connected to the star ground and also to other board pins to the right to provide their ground path. Also Pin 3 will connect to the MV pot - front and rear left tabs - that's the ground path for the MV.

Make sure something else that you connected isn't grounding out the signal. You did try turning the master volume in both directions?

What is the color code on your 2.2M resistors? In the photo it looks red/red/yellow.

Tried the MV both directions everything appears and checks to be ok... it's like i am missing a wire?? I will put it back to stock to make sure it's not a problem with the ot... nothing though gives the indication that could be the problem.. really weird.. keep you posted....

Alright put it back to stock worked fine and ruled out any power problems.. Tomorrow I will try again.. I really want to see this mod work..

[M Fowler]

Why not just wire the cut control normal not Ceriatone style and then concentrate on the dual gang MV pot wiring to the board.

Mark

[playonit]

dupe post

[playonit]

[.

I have continuity.. the resistors are 2.2m.. the center pin is not hitting the pin to right. should there be another wire going from pin 3 to the star ground?? I tried that and it didn't help..

Pin 3 on the board should be wired exactly like the Ceriatone layout, except it will be missing the two 220K resistors. Pin 3 is connected to the star ground and also to other board pins to the right to provide their ground path. Also Pin 3 will connect to the MV pot - front and rear left tabs - that's the ground path for the MV.

Make sure something else that you connected isn't grounding out the signal. You did try turning the master volume in both directions?[/quote]

What is the color code on your 2.2M resistors? In the photo it looks red/red/yellow.

My resistors are gold, gold, red, red = 2.2ohm not 2.2m - could that be the problem??

[Diablo1]

[.

I have continuity.. the resistors are 2.2m.. the center pin is not hitting the pin to right. should there be another wire going from pin 3 to the star ground?? I tried that and it didn't help..

Pin 3 on the board should be wired exactly like the Ceriatone layout, except it will be missing the two 220K resistors. Pin 3 is connected to the star ground and also to other board pins to the right to provide their ground path. Also Pin 3 will connect to the MV pot - front and rear left tabs - that's the ground path for the MV.

Make sure something else that you connected isn't grounding out the signal. You did try turning the master volume in both directions?

What is the color code on your 2.2M resistors? In the photo it looks red/red/yellow.

My resistors are gold, gold, red, red = 2.2ohm not 2.2m - could that be the problem??[/quote]

Absolutely Yes - That is your problem!
That's why I was asking about their color code.
2.2 ohm resistors shorts out all your signal to ground so no signal gets to the power tubes.

Replace those resistors with 2.2M - red/red/green, and it will work fine.
The purpose of those 2.2M resistors is for grid leak. When the pot is turned all the way up, the grid leak value is 220K, which is the same as the stock value of the grid leak resistors that were removed.

If you don't have a pair of 2.2M resistors handy, you can just remove the the 2.2 ohm pair you have wired to the pot and it will work fine. The grid leak value will now be 250K when the pot is turned all the way up.

2.2M resistor is 2.2 million ohms, a whole lot bigger than 2.2 ohms.

[playonit]

I have continuity.. the resistors are 2.2m.. the center pin is not hitting the pin to right. should there be another wire going from pin 3 to the star ground?? I tried that and it didn't help..

Pin 3 on the board should be wired exactly like the Ceriatone layout, except it will be missing the two 220K resistors. Pin 3 is connected to the star ground and also to other board pins to the right to provide their ground path. Also Pin 3 will connect to the MV pot - front and rear left tabs - that's the ground path for the MV.

Make sure something else that you connected isn't grounding out the signal. You did try turning the master volume in both directions?

What is the color code on your 2.2M resistors? In the photo it looks red/red/yellow.

My resistors are gold, gold, red, red = 2.2ohm not 2.2m - could that be the problem??

Absolutely Yes - That is your problem!
That's why I was asking about their color code.
2.2 ohm resistors shorts out all your signal to ground so no signal gets to the power tubes.

Replace those resistors with 2.2M - red/red/green, and it will work fine.
The purpose of those 2.2M resistors is for grid leak. When the pot is turned all the way up, the grid leak value is 220K, which is the same as the stock value of the grid leak resistors that were removed.

If you don't have a pair of 2.2M resistors handy, you can just remove the the 2.2 ohm pair you have wired to the pot and it will work fine. The grid leak value will now be 250K when the pot is turned all the way up.

2.2M resistor is 2.2 million ohms, a whole lot bigger than 2.2 ohms.[/quote]

Excellent Thanks!!! It's great how much help I receive and how much I am learning...

I just added some to an order I just placed.. let you know how it goes next week... I just checked my previous invoice.. I ordered right they sent them wrong. I let them know so they can check there picking bin for accuracy... that said.. shame on me for not checking the resistance before installing them... did the same thing last week on another project... what a DUFUS ...

[Diablo1]

Playonit said:
"I just added some to an order I just placed.. let you know how it goes next week... I just checked my previous invoice.. I ordered right they sent them wrong. I let them know so they can check there picking bin for accuracy... that said.. shame on me for not checking the resistance before installing them... did the same thing last week on another project... what a DUFUS ..."


In the meanwhile, just disconnect the two 2.2 ohm resistors from the MV pot and try it out. It will work fine.

[kbperry810]

I've ran into that as well... ordered 100k's, got a bag of 100's - always a good idea to double check!

Glad I came across this thread; I had no intention of building a DC30 but then came across a chassis for sale on TGP a short while back and went for it. I have a few things to contemplate now before I actually get started.

Just waiting on a few part orders to arrive, and haven't settled on a tranny set yet... but I'm sure I'll go with West Labs; Dave's a great guy and just about an hours drive down the highway from me.

[IMG682]http://i1003.photobucket.com/albums/af1 ... G_2666.jpg[/img][/img]