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Old 7th September 2012, 12:59 PM   #11
6L6 is offline 6L6  United States
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Of course.

Read page 7 and 8 of the manual, and then build it as in this diagram - -

Click the image to open in full size.

(Image taken from 9-pin CCDA manual, Tubecad.com)

Hook up the HV wires as above.

Read pg 9, 10, 11 of the manual, and attach the 6.3v heater winding according to this diagram -

Click the image to open in full size.

And connect the heater jumpers as necessary for a 6.3v heater with 6.3v tubes. (pg 9, bottom diagram)

Lastly, insulate and tape the ends of the 5v heater winding and ignore them. They will render them inert. Don't cut the leads off, you might use this transformer for something else in the future.

Last edited by 6L6; 7th September 2012 at 01:03 PM.
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Old 8th September 2012, 02:26 AM   #12
SKLau is offline SKLau  Australia
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Many thanks 6L6 for the detailed illustration. It makes me confident in building the CCDA. Thanks again for all your helpful info.

Best wishes

Arron
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Old 8th September 2012, 03:04 AM   #13
6L6 is offline 6L6  United States
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My sincere pleasure.

Please feel free to post any questions you have concerning this project in this thread, it's going to be awhile before you proceed, Antek does take awhile, and then you have to ship it...


By the way, I would be very interested in knowing how much it costs all in to your door. pure curiosity.

In the time being, make some plans regarding you chassis, or just plain begin, get the input jacks and selector wired, the pot or attenuator, and your output jacks. As well as Mains input, fuse, power switch, etc...

Also, read the manual a number of times, Broskie puts a ton of information in that document, very densely packed, and it takes a few readings to get your head around all what he says. A lot of it is due to the adaptability of the PCB, but there is still fantastic amounts of info.

Looking forward to seeing how your project comes along!

Cheers,

Jim
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Old 9th September 2012, 06:31 AM   #14
SKLau is offline SKLau  Australia
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Hi Jim, the project is in the preparation stage. It would be months away to complete the project. I will post a thread for the process of building the CCDA.

I have read your threads and shared your experience in building of the audio gears. I will post any questions if I need help.
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Old 12th September 2012, 06:03 AM   #15
SKLau is offline SKLau  Australia
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Hi Jim,

I have a question on the transformer heater output voltage required by the CCDA 9 pins 6.3v heaters using the full wave rectification and regulation. The manual on page 10 says:

Heater Regulator = LD1085, LM317, LM350, LT1085,
Vac Input = 7-8Vac @ 5A for 6.3Vdc

The XPWR196-240 heater output is 6.3vac. Is it assuming to be used with 6.3v ac heaters?

I will use the full wave rectification and regulation for 6.3v heaters. What heater output voltage I should go with, the 7-8v or 6.3v?
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Old 12th September 2012, 01:51 PM   #16
6L6 is offline 6L6  United States
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The heater winding on the Edcor (and Hammond, for that matter...) asumes that you are going to be using AC for the heaters.

But when making a preamp AC isn't the best idea, regulated DC is much quieter.

No worries, we will use that heater winding to make DC.

The regulator must see a greater voltage on it's input than it's output.

So we will take the AC heater winding and rectify it with a 'voltage doubler' circuit.

This will make DC at about 12v. The 12v DC will be attached to the input of the regulator, and the regulator circuit will reduce it 6.3v DC, and also make it very smooth and quiet.

Specific to your question about the 7-8Vac as input, that is not the configuration that will work with that transformer. With the 6.3Vac winding, you need to use the voltage doubler configuration on the board for the heaters. -- see page 11, bottom diagram.
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Old 12th September 2012, 03:02 PM   #17
6L6 is offline 6L6  United States
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SKLau -

I'm very sorry, looking at my previous posts, specifically #11, I see that I pasted the incorrect diagram for the heaters.

My mistake.

This is the proper heater diagram --

Click the image to open in full size.

It takes the 6.3Vac heater winding, changes the voltage, rectifies, smooths and regulates it to 6.3V DC.
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Old 13th September 2012, 04:41 AM   #18
SKLau is offline SKLau  Australia
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Thanks Jim for the clarification. Now I have a better understanding for it.

The 6.3v winding has 2 brown wires on the XPWR196-240 schematic. One is 6.3v and the other is common. The Voltage Doubler has two connecting points, the AC and A. Does it require orientation from the 6.3v wiring? If yes, how I differentiate the common brown wire. There may be a dumb question but just want to be sure.
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Old 13th September 2012, 04:48 AM   #19
6L6 is offline 6L6  United States
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The only dumb questions at those that are not asked.

In this case there is no difference between the two brown wires.
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Old 13th September 2012, 12:53 PM   #20
SKLau is offline SKLau  Australia
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Jim,
Many thanks for your help. I can get start for the project.
With best wishes,
Arron
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