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Old 13th February 2013, 07:38 PM   #181
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If that shows couple mA of current, then check voltage across Pin1 and 2 of the pot and see if you can vary it. If yu want to be safe, detach transformer. If you have a varying voltage across the pot, then you have a transformer problem. If you dont have varying voltage across the pot, then you have a fried pot.
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Old 13th February 2013, 11:17 PM   #182
cjkpkg is offline cjkpkg  United States
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2.9mA across each 10k resistor...voltage varys from 5.5v down to zero with pot. Dammit...something must be up with the xformers.

I have the cinemags.
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Old 13th February 2013, 11:20 PM   #183
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No biggie. Tea was probably right and you mounted them wrong.
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Old 14th February 2013, 01:21 PM   #184
cjkpkg is offline cjkpkg  United States
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nope...all mounted correctly...they are keyed so you cant do it wrong.

One last question...one last shot...maybe reduce the 10K resistors after the pots?
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Old 14th February 2013, 01:30 PM   #185
Zen Mod is offline Zen Mod  Serbia
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nope

give us pictures of your setup

both sides of pcb etc

macro
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Old 14th February 2013, 04:46 PM   #186
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any update on the group buy link for F6 convertible parts? I thought it was coming up today...
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Old 14th February 2013, 05:14 PM   #187
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Always behind. Whole day job thing I'll get it up tonight. Good news is that there are no difficult parts so I will be ordering 25 kits this weekend. Will be in Georgia all week, next week, but should be able to ship on return. Only caveat is if someone wants Cinemags as well. May add time. I'll also be closing the toroid GB after I get back, so hopefully we can sum everything up nicely.
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Old 14th February 2013, 08:41 PM   #188
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Quote:
Originally Posted by buzzforb View Post
Always behind. Whole day job thing I'll get it up tonight. Good news is that there are no difficult parts so I will be ordering 25 kits this weekend. Will be in Georgia all week, next week, but should be able to ship on return. Only caveat is if someone wants Cinemags as well. May add time. I'll also be closing the toroid GB after I get back, so hopefully we can sum everything up nicely.
Darn, I think I will need Cinemags....I can wait. Got a long line of F5s waiting to be built
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Old 14th February 2013, 08:45 PM   #189
PKI is offline PKI  United States
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Where should I sign for the kit? Count me in, anyway :-)
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Old 14th February 2013, 11:09 PM   #190
cjkpkg is offline cjkpkg  United States
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ok..I can't find my camera yet. here is the update today.

I powered up the other channel which still has the buffer and all pots as well as a red and a blue led. it biases up no problem. I then swapped the xformers and same result bias with no issue.

so I am now inclined to think the mosfets might be toast for some reason.

all resistors check out all solder points are good.

with all the messing around with that board it's pretty bad off now...Mike would you have one spare channel you could send me? PM me if you do and we can settle up.

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