sr1200

Re: All things LA2a related
« Reply #2580 on: March 15, 2018, 09:14:00 AM »
U sure your transformers are good?
MEI Studio - Long Island, NY: http://www.meirecords.com


Re: All things LA2a related
« Reply #2581 on: March 15, 2018, 09:16:57 AM »
Hey Sr1200, I am not positive about that, and that is one thing that I am worried about.  I used a continuity checker and probed around the legs of the transformers, but  I admit, I barely knew what I was doing.  I am not sure of the proper way to check a transformer. 

sr1200

Re: All things LA2a related
« Reply #2582 on: March 15, 2018, 09:24:20 AM »
One way is to check  the resistance with your multimeter across the windings.
MEI Studio - Long Island, NY: http://www.meirecords.com

Re: All things LA2a related
« Reply #2583 on: March 15, 2018, 09:29:43 AM »
I am getting readings by putting the negative lead on primary and checking all other legs on the A24, varying from about 1.7 -2.5 with the ohm meter set to 20k.  I even hear a little static come out of the speakers when I touch the legs due to the xlr's still being plugged in and the unit patched (The unit is unplugged and turned off during all of this.) 

Matt
« Last Edit: March 15, 2018, 09:56:17 AM by sonicrevolution »

sr1200

Re: All things LA2a related
« Reply #2584 on: March 15, 2018, 09:48:16 AM »
Trace your signal path next.  Follow the schematic from input to output... see where the signal gets lost. 
MEI Studio - Long Island, NY: http://www.meirecords.com

Re: All things LA2a related
« Reply #2585 on: March 15, 2018, 09:59:38 AM »
Thank you for the reply, one quick question, when the unit is powered on, as long as I am grounded (to chassis I'm assuming) Is it fine to poke around all the components without sparks or being electrocuted.  That's been my biggest hang-up, is I am just getting used to working with high voltage equip.  thanks again.

Matt

sr1200

Re: All things LA2a related
« Reply #2586 on: March 15, 2018, 03:06:16 PM »
depends on what you're poking around with... I wouldn't stick my finger in there.  There is potentially lethal, high voltage in this unit.  Don't bend things till they touch another component or the chassis.  Always exercise caution, and if you're not comfortable with it... don't risk it.
MEI Studio - Long Island, NY: http://www.meirecords.com

Re: All things LA2a related
« Reply #2587 on: March 15, 2018, 04:22:54 PM »
good advice,
I was referring specifically to when I am using my DMM, and alligator clipped to chassis.  at that point am I free to probe values at all points?  Thanks for the help.

Matt

sr1200

Re: All things LA2a related
« Reply #2588 on: March 18, 2018, 11:05:04 PM »
make sure your meter can handle the voltage in dc for everything after the power section (B+ forward)
MEI Studio - Long Island, NY: http://www.meirecords.com

DanKoVO

Re: All things LA2a related
« Reply #2589 on: March 20, 2018, 01:18:04 PM »
Has anyone here done any diy upgrades to their LA2A clones like the Wa2a? Looking at the revive mod, it doesn't look to complicated to drop in some higher quality audio capacitors and some drop caps.


RO4350

Re: All things LA2a related
« Reply #2590 on: March 22, 2018, 05:19:18 AM »
Hey guys, I'm going to build a p2p LA2a and started sourcing parts. I'm curios why everyone around seems to use 2Watt pots.
After a short view on the schematic and a rough calculation I guess that 1/2W ones will do the job, even 100mW should be fine. I would have to take a close look to verify. So is there something I overlook?

Re: All things LA2a related
« Reply #2591 on: May 07, 2018, 11:42:32 AM »
Hello friends, I'm from Brazil, and I want to build an LA2A for my home-studio, but I have a question, I can not know what element  "electroluminescence element" this is. I know it's a light for ldr, but it has no specification. Can someone help me? thank you!
http://www.tangible-technology.com/dynamics/la2_inputb.JPG



 

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