Isn't the simple way to achieve this to simply short the inputs and rule out the input signal chain altogether? That way you can be entirely sure that the issue is with the amp and not something else.
Is there a plan to do something with an input signal as a next step, somewhere? I'm not sure what ZM has in mind. I'm learning here, so I'd like to understand.
If you want to run some current through (suspect) JFETs and risk further damage than.... yeah
that was just Moi asking while thinking what could be possible cause of amp going Dodo
one of things is DC Zap! on input
so , now that's excluded
I’ve tested between all of the mosfet, JFET and transistor pins and from pins to ground. Some of the mosfets buzzed til the caps charged. Appears Ok. I’ll add the suggested spring washers to the mosfet screws when I know I don’t have to pull them off again.
Didn’t get to running the diode checks on all yet. Father’s Day here so.. I’ll get to it during the week. Thanks for the guidance so far.
Didn’t get to running the diode checks on all yet. Father’s Day here so.. I’ll get to it during the week. Thanks for the guidance so far.
When I blew a couple of 1.25A fuses due to inrush current.. Could that have zapped anything?
try to be methodical , compare each step with good channel
nope, except fuse , nothing could be stressed
Well, scratch my previous ideas...
I've been listening to the Aleph J as much as I can. I can't seem to tear myself away from it. I had a number of people give it a listen last night also. The general consensus is simply... WOW!
I think the path forward will be to convert this chassis over to dual mono and add the XLR inputs. Then, I can wait for another chassis and duplicate the PSU/chassis set up for other amps.
It seems to be a well-established fact, but this is a VERY special amp. 😀
I've taken a look around to very little avail. Is there a good thread or an area in a thread where you guys would recommend learning about how to build up a dual mono supply. I'm not ready for PSUs in a separate chassis. I want to get the parts / boards / transformers / transfo brackets ordered.
With thanks!
look at pictures in SissySIT tips and tricks thread , or generally majority of my builds - there is really nothing special in building dual mono PSU - it's practically same as common (for both channels) one , just duplicated in number
🙂
practically , just IEC and switch are common , everything after (mains fuse, mains NTC, bridges,cap bank, GND to case-NTC ) is separate for each channel
🙂
practically , just IEC and switch are common , everything after (mains fuse, mains NTC, bridges,cap bank, GND to case-NTC ) is separate for each channel
Thanks, ZM. I know you're a big advocate for dual mono for the FW builds. I just haven't had the guts to try it yet. Also, I admittedly wanted to put the $ toward more amps boards etc. I'll get to work. 😀
If I make up some test leads for my all in one LCR tester will I be able to check the functionality of my mosfets, JFETs and transistors in circuit, without desoldering and removal?
nope
that requires special testers , where you're paying dearly "in-circuit testing" label on them
that requires special testers , where you're paying dearly "in-circuit testing" label on them
... not so fast with the expensive tag.
Would a bit of gear like this help?
In Circuit Transistor Tester Kit | Jaycar Electronics
Hi, I’ve just tested all mosfets, transistors and JFETs using the diode setting on my DMM. The results are identical for the left (bad) and right (good) channel. I tested every pair of legs twice, swapping the +\- probes for every pair. I think I’ve covered all possibilities with the diode test feature and haven’t isolated a suspicious part.
Any suggested further tests I can do before removing parts?
Any suggested further tests I can do before removing parts?
I inspected both sides really carefully with a magnifying glass last weekend and didn’t spot anything. I can probably reflow all the joints tomorrow night.