[silent:arts]

Re: D-LA2A Support Thread
« Reply #1920 on: March 13, 2019, 04:30:33 PM »
You are puzzling me. How do you recognise increased gain in a channel not passing signal?


Holger

Re: D-LA2A Support Thread
« Reply #1921 on: April 06, 2019, 01:45:06 PM »
Another one: built around an old Weston 862 meter. Currently I'm using Kenetek's here. I/O TX are Carnhill 9k6:600.The meter has a sticker marked 1966 on it. The 5V PSU went crazy when connecting the meter bulbs so I used a little 5V MeanWell SMPS for relays and meter illumination. Knobs are 40mm dia. Fat looking guy...





[silent:arts]

Re: D-LA2A Support Thread
« Reply #1922 on: April 07, 2019, 02:52:36 AM »
Nice as always - only one but big meter as always - a true CLAßEN.

This will be used in the Röhren(Rein)Raum at the Krässemaschinenwerke Hamburg?

Holger

Re: D-LA2A Support Thread
« Reply #1923 on: April 08, 2019, 02:42:53 PM »
Nice as always - only one but big meter as always - a true CLAßEN.

This will be used in the Röhren(Rein)Raum at the Krässemaschinenwerke Hamburg?

;-) yes...

dmp

Re: D-LA2A Support Thread
« Reply #1924 on: April 08, 2019, 02:51:39 PM »
It's my understanding that LA2A's run very hot gain-wise by nature and running them with the gain above 7-ish or so can / will result in artifacts.  Mind you, I don't have past hands-on experience here as this is my first hardware LA2A.  I have read within this forum and on the Interwebs suggesting that this is 'normal' behaviour, so at this point I haven't worried about any of that.    If I remember correctly, some of the 'fix' included swapping the 12AX7 out for lower gain tubes.  Honestly, at a gain setting of 7 the signal is WAY too hot for anything I'd ever use or want.  The signal is very distorted at those levels and not in a pleasant way IMHO.

If others here have contrary information to add here, a little help / input would be appreciated.

Be that as it may be, I'm interested in actually testing here.  So I undertand.... when you turn the gain up above 7 or so, you get an oscillation at 18KHz with no audio signal being input?   If so, I'll give this a test when I get a few minutes and report back.

I have to go back and look into it again, but my recollection is that with peak reduction way up and the gain way up, we got this ~18kHz noise. We were running a track into it at the time .
I made mine with Jensen 1:1 line in transformers which works really well (unless you want to run mic signals into it).  The gain is needed in this configuration when compressing heavily.

Eliani

Re: D-LA2A Support Thread
« Reply #1925 on: May 03, 2019, 04:09:32 PM »
I haven't gon through the whole thread yet...  ::)
But the BOM to dropbox link is broken on the first post...
Is anyone willing to share his.. mutch appreciated
"Iron Projects" at Eli-Audio.com

QNote

Re: D-LA2A Support Thread
« Reply #1926 on: May 09, 2019, 07:29:41 PM »
I haven't gon through the whole thread yet...  ::)
But the BOM to dropbox link is broken on the first post...
Is anyone willing to share his.. mutch appreciated

See Page 89 in this thread.  I have an updated link there, along with other resources.  New theory and troubleshooting videos in just a few weeks (I shot one of them yesterday).

BOM Link:  https://www.dropbox.com/s/2xky62b30ccsvfw/D-LA2A_BOM_QNS.xlsx?dl=0
« Last Edit: May 09, 2019, 07:54:40 PM by QNote »

weiss

Re: D-LA2A Support Thread
« Reply #1927 on: May 09, 2019, 09:01:51 PM »
Another one: built around an old Weston 862 meter. Currently I'm using Kenetek's here. I/O TX are Carnhill 9k6:600.The meter has a sticker marked 1966 on it. The 5V PSU went crazy when connecting the meter bulbs so I used a little 5V MeanWell SMPS for relays and meter illumination. Knobs are 40mm dia. Fat looking guy...

where do you always find them?
i only come across these way overpriced meters for several hundred bucks..  :o

https://reverb.com/item/11073137-1950-s-weston-electric-model-862-vu-meters-vintage-bakelite-with-black-panel-free-shipping
« Last Edit: May 09, 2019, 09:04:56 PM by weiss »

Holger


 

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