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In Reply to: RE: If you get the gumption... posted by slownlo on August 20, 2011 at 05:26:15
I've thrown together a couple F-5's by Pass but I may investigate the unit you built.
F-5's are really tempermental and sometimes frustrating to deal with.
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Let me know what you mean...I was going to build one next. If you've run into issues let me in on them and how you resolved them..
My ZEN is on crutches right now...(lol)...I turned on my preamp out of sequence (I usually turned on the preamp FIRST and BEFORE I turned on the ZEN)....there was a small "pop" from the speakers, didn't sound like much...but now it just blows fuses. I think I may have hurt the input MOSFET since its not protected...but didn't think that would cause fuses to blow? I'll assume the DIY Grounded GRID tube preamp I was using surged voltage upon turn-on and caused damage..."c'est la vie" I guess...
if the outputs are also mosfets I would check those first.
Had the pop upon blowing an output on the F-5.
As far as tempermental, I found it really hard to get it to stabalize when trying to bias it.
Also when checking after some run in time it drifts a lot.
I know my PS is well built with plenty of capacitance per rail. (42k)
Plus the heat factor.
I felt like it needed more constant attention than I was willing to give.
You may feel differently.
Good sound out of it but feel it was underpowered for my needs.
Did you use the optional 4.7K thermistors that supposedly help compensate for any thermal drift?
absolutely.
I've tried different board versions and while it sounds good, to me it just is like a child that needs a little too much attention.
Just my take on things.
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