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Old 25th June 2012, 10:10 PM   #3401
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Nelson Pass View Post
........

Correct me if I'm mistaken, ZM

I first posted gif , but it was unreadable

so moi edited - posted jpg this time

and I think colors are as on sketch I posted and , you're right

never mind , you gave recipe , colors are boring details

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File Type: jpg Jensen datasheet.jpg (36.6 KB, 539 views)
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Old 25th June 2012, 10:15 PM   #3402
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Quote:
Originally Posted by Zen Mod View Post
two things , unfortunately : I'm not Pa
My spiritual leader, from the small state of Butane in the Himalayas, told me i should call you Nutpa.
(i just met him at the gas station, so i wanted to check if it's ok with you)
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Old 25th June 2012, 10:18 PM   #3403
Zen Mod is offline Zen Mod  Serbia
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you can call me Buddha's left nut , if you wish ......

that will not change nuttin'

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Old 25th June 2012, 11:58 PM   #3404
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Thank you PaPa and NutPaPa

I am looking for the Jensen JT-123-ALCF for the experiment

Bob
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Old 26th June 2012, 12:04 AM   #3405
Zen Mod is offline Zen Mod  Serbia
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that reminds me on :

PAPA'S KOAN ....... was Papa's Surprise


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Old 27th June 2012, 02:33 AM   #3406
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Transformers ordered.
Will report when I complete mod
Thanks again
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Old 6th July 2012, 11:04 PM   #3407
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Hooked up the 4 Jensen JT-123-ALCF transformes wired as Nelson and Choky pointed out in posts 3399 and 3400 to my F4 headphone board.

I lifted R3 and R4 on the version 2 boards currently in the DIYAudio store on the cap side. I connected both leads to the transformer input (grey/brown)
The output was connected to the F4 board where R3 was lifted and the ground was also connected to the F4 board.

The sound is absolutely superb !!!! Have listened to Etta James, Eva Cassidy, Nina Simone, Phoebe Snow, Judy Collins, Doug McCloud, Laura Nyro and Van Morrison. Voices are amazing as is sound stage. Plenty of detail and outrageous bass. No problem driving the my HiFiMan 500s

Thanks Nelson and Choky for the help. Choky I see why you like the M2 !!!
Should I call mine a M2F4headphone amp?

Might have to build a SE version to drive the Ravens in my system.

Best

Bob
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Old 7th July 2012, 12:05 AM   #3408
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awesome. I have 4 of the Sowters coming. I will try SE, but have plans for something else. Usually if ZM or Nelson suggest something, It is worth trying for no other reason than learning.
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Old 7th July 2012, 01:04 AM   #3409
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awesome. I have 4 of the Sowters coming. I will try SE, but have plans for something else. Usually if ZM or Nelson suggest something, It is worth trying for no other reason than learning.
You are absolutely right. I learned a great deal from doing this !!!!!
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Old 15th July 2012, 06:22 AM   #3410
neoinc is offline neoinc  Singapore
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Default Crippled F4 with BA3

I have yet finished with the chassis but am excited to test it out my new crippled F4 with BA3. It is singing now.

However the bias of some transistors especially the set of IRF240 were off by 10-40mV at around 200mV. I could have mismatched them and the method i used could be incorrect.

Using Conrad's heatsink, I could only touch the heatsink for 3 seconds. Question is whether the transistors will give up easily at the rate of dissipating this is going or should i lower the bias or add more heatsink?

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