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Old 15th June 2012, 02:09 AM   #771
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I want my amp burning but not vaporizing. Would it be considered reasonably safe running 2sk2013/j313 at 8W assuming one was to mount them on an adequate heatsink (ie bad @ss)?
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Old 15th June 2012, 02:25 AM   #772
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IN Juma's f5, I think they are biased at .5A with 24V rails BIG heatsink. At least mine were. Sounded very nice IMO.
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Old 15th June 2012, 02:43 AM   #773
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sounds good. Ok I will bias them at 300ma
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Old 15th June 2012, 03:27 AM   #774
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Nelson you did not talk much about R13. Quite a bit of gain is lost through this resistor, I like that but not sure what other effects it has on the amp.
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Old 15th June 2012, 05:43 AM   #775
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Old 15th June 2012, 05:47 AM   #776
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yeah. I'll have to get off my @rse and start reading the thread from the beginning.
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Old 15th June 2012, 10:56 AM   #777
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This is confusing the hell out of me Nelson.

"This was taken with a 600 ohm source. It gets a little better with a 25
ohm source, but that's not to say it sounds better."

Are you talking about source resistors R10 and R11?
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Old 15th June 2012, 11:51 AM   #778
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He is talking about source that the input sees, or the Zo of whats driving it. I believe he has a switch on his AP rig that allows this to be selected.
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Old 15th June 2012, 11:55 AM   #779
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Yeah that is what I initially assumed, but then I thought what has that got to do with the performance of the amp?
That is an indication of the performance of the preamp.
Besides it would be very easy to increase the input impedance of the BA3 to 100k.
I don't understand the point he is making
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Old 15th June 2012, 11:57 AM   #780
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600ohm could suggest a transformer input/output. ZM talks in M2 threead about interesting fun with transfomers in differential mode
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