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Old 9th February 2013, 04:33 PM   #131
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Quote:
Originally Posted by buzzforb View Post
TTea and I have discussed a GB, but i was uncertain of the demand. If there is interest, we can pull one together. I can start a sheet if there is interest.
Im interested too, 2 pairs please.
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Old 9th February 2013, 05:01 PM   #132
generg is offline generg  Germany
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@tea-bag


F6 pcb Jensen version arrived today..!

They look really very fine.....
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Old 9th February 2013, 05:06 PM   #133
cjkpkg is offline cjkpkg  United States
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Fudge...

R2 and R11 on one channel let out the smoke. I tried another set of jfets to no avail...not sure where to look next...
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Old 9th February 2013, 05:39 PM   #134
generg is offline generg  Germany
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you mean R11 and R12?

in this case you could have changed the J-Fets place....?
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Old 9th February 2013, 06:17 PM   #135
cjkpkg is offline cjkpkg  United States
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Nope oddly enough its r2 18 ohm and r11 10 ohm.

Using irfp240 as well...not semi south.

Bias pots were set to min
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Old 9th February 2013, 06:18 PM   #136
cjkpkg is offline cjkpkg  United States
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I suppose I could try unbuffered...assuming all else is well.
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Old 9th February 2013, 06:28 PM   #137
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are you sure the transformer is on correctly?
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Old 9th February 2013, 06:43 PM   #138
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Couple other thoughts. Make sure the LEDs are mounted correctly.
The positive anode is the small circle, the cathode side is larger square pad.
This may be backwards of some designs.

Also, I would not mount any outputs at first.
Only time I had a short was when I did not have all appropriate pins soldered on the daugter card male pins, or the female pins on the main board. I bring up slow with a variac, so did not smoke anything.
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Old 9th February 2013, 07:16 PM   #139
cjkpkg is offline cjkpkg  United States
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I switched xformers and now only have the bad channel powered. Same thing smoke from r2 and r11 so I suspect the xformers are hooked up correctly.

I still suspect the front end jfets... I have genuine 170s but the j74s are suspect.
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Old 9th February 2013, 07:22 PM   #140
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I have some advice that i would suggest to all. Build your ampone section at a time, starting with FE, then bias section, then add ouput fets. This minimizes damage and even helps in understanding the circuit.
short cut is dimbulb tester.
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