Russell: Are you running the BA output stage and the ba3 preamp together? Do you have enough gain without a preamp in front of the ba3 front end?
Iam considering swapping my f5 for a ba complementary os. I love the f5 but it might be time to switch to something with more current for low z loads.
I am using both the BA-3 preamp AND a complete BA-3 Power amp. Plenty of gain!
Russellc
Mouser has thousands of the Fairchilds -
FQP3P20 Fairchild Semiconductor | Mouser
FQP3N30 Fairchild Semiconductor | Mouser
FQP3P20 Fairchild Semiconductor | Mouser
FQP3N30 Fairchild Semiconductor | Mouser
There's no need to match them.
I'm such a new guy. So what needs matching then? The JFETs and the MOSFETS (IRFP240's) on the output boards?
the BA3 has no paralleled active devices.
Therefore
Only where paralleled active devices are used, does it become necessary to do some selection/matching.
Pass has a webpage describing how they recommend that you do this, if needed.
Therefore
as stated by 6L6 applies.There's no need to match them.
Only where paralleled active devices are used, does it become necessary to do some selection/matching.
Pass has a webpage describing how they recommend that you do this, if needed.
the BA3 has no paralleled active devices.
Therefore as stated by 6L6 applies.
Only where paralleled active devices are used, does it become necessary to do some selection/matching.
Pass has a webpage describing how they recommend that you do this, if needed.
So this leads me to believe the only matched pieces on my whole SE BA-3 are the IRFP240's? Can I forgo matching the input JFET's as well?
Is there a single Nchannel jFET and a single Pchannel jFET?
Then no matching.
There's two of each, but on separate channels, so I'd assume I'm good to go.
That's enough to make my head spin.
So, I haven't heard from buzzy yet. Would it be safe if I just went and bought the output mosfets from Mouser w/o matching, and then sourced the matched JFETS online or whatever?
I'm confused on why the JFETs would need to be matched, but not the output MOSFETS. Doesn't the signal run through both of them?
I'm confused on why the JFETs would need to be matched, but not the output MOSFETS. Doesn't the signal run through both of them?
So, I haven't heard from buzzy yet. Would it be safe if I just went and bought the output mosfets from Mouser w/o matching, and then sourced the matched JFETS online or whatever?
I'm confused on why the JFETs would need to be matched, but not the output MOSFETS. Doesn't the signal run through both of them?
No matching because there are no paralleled semiconductors.Is there a single Nchannel jFET and a single Pchannel jFET?
Then no matching.
Thanks guys. I have 12 matched IRFP240's coming, and am compiling some last remaining items. Then all I need is the transformer and chassis.
I'm putting some effort into the front panel too. I'll be turning some giant aluminum knobs myself and then I'm going to make a bird's eye maple front panel with blue backlit knobs. Stay tuned.
I'm putting some effort into the front panel too. I'll be turning some giant aluminum knobs myself and then I'm going to make a bird's eye maple front panel with blue backlit knobs. Stay tuned.
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