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Old 20th July 2012, 05:17 PM   #201
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Quote:
Originally Posted by mattmcl View Post
Yup, it takes a good 10 minutes to warm up, and gets really good after 20. I'm super busy this weekend, maybe some night next week?
Sure, I should get the resistors in early next week. They aren't going to be super easy to change out because I used those big 25V electrolytics for the heaters instead of 16V, so I need to take the PCB out and solder them to the top of the PCB... I'll text you when its ready.
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Old 24th July 2012, 04:47 PM   #202
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Mouser was fast and I replaced the resistors yesterday, now the heater voltage is ok and the preamp is finished! HV is a little high at about 330V but I'm ok with that.

Thanks for all the advise and help from everyone who has contributed to this thread!
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Old 25th July 2012, 03:06 AM   #203
mattmcl is offline mattmcl  United States
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I have two pairs of outputs on my 9 pin, wired in parallel. I want to convert one of them to summed output for a subwoofer. I suspect I need to wire in some resistors- does anyone have suggestions on values?
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Old 29th January 2013, 03:05 AM   #204
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Here's my version of Aikido. It uses 6N1P-EV and 6N6P tubes.
B+ 220V, 6.3V heaters, cathode resistors - 430R, transformer - dual primary, secondaries 250V, 2x7.5V (in parallel for 4A).

Sounded excellent while in my possession. Building another one, this time I intend to keep it. Will post pics later.
Attached Images
File Type: jpg Aikido 003.jpg (745.8 KB, 333 views)
File Type: jpg Aikido 001.jpg (722.0 KB, 317 views)
File Type: jpg Aikido 002.jpg (684.1 KB, 304 views)
File Type: jpg IMG381.jpg (804.4 KB, 305 views)
File Type: jpg IMG382.jpg (763.0 KB, 297 views)
File Type: jpg IMG383.jpg (808.1 KB, 141 views)
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Old 29th January 2013, 04:12 PM   #205
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by ClefChef View Post
Here's my version of Aikido. It uses 6N1P-EV and 6N6P tubes.
B+ 220V, 6.3V heaters, cathode resistors - 430R, transformer - dual primary, secondaries 250V, 2x7.5V (in parallel for 4A).

Sounded excellent while in my possession. Building another one, this time I intend to keep it. Will post pics later.
Outstanding execution!
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Old 29th January 2013, 04:58 PM   #206
mattmcl is offline mattmcl  United States
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Nice work. Wait until it burns in. Mine really started to shine after 50 hours or so of use.
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Old 11th March 2013, 04:29 AM   #207
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Yet another build...

Click the image to open in full size.
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Old 12th March 2013, 03:10 PM   #208
bondul is offline bondul  United States
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Hi ClefChef, Could you tell me what transformer that you use? And where did you get it from?
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Old 12th March 2013, 04:30 PM   #209
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ebay 250v + 7.5v, endbells from edcor.
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Old 19th April 2013, 03:35 PM   #210
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Finishing another Aikido, this time with elevated AC filaments. Initial test show that this is the path worth taking - less heat, less load on transformer, and absolutely no hum, plus it sounds great.

Transformer - Edcor dual primary, 250V @ 200ma + 6.3V @ 3.5A secondary. B+ adjusted to 240V with 230V at the anodes. Tubes 6n1p and 6n6p, cathode resistors - 330R so the tubes are biased for a bit more current.

I had to cut some traces in order to do elevated AC filaments. It would be just great having such option ready on the board, something JB could probably work into his next design.

Now it is time go start fabricating that chassis.
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Last edited by ClefChef; 19th April 2013 at 03:38 PM.
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