Cainester

All things LA2a related
« Reply #40 on: December 10, 2004, 05:11:17 PM »
Should I put all the tubes in and measure again?


Scenaria

All things LA2a related
« Reply #41 on: December 10, 2004, 05:11:50 PM »
just dont put the T4b in yet :)

if you put the tubes in.. go back and check across the neon again.. if everything else looks about right

SSLtech

All things LA2a related
« Reply #42 on: December 10, 2004, 05:20:20 PM »
yes indeed, the readings are expected to be high without tubes fitted.

I think I typed in some values to check in the notes I sent to Scenaria... They varied by about 5volts or so. When you put the tupes in you should have lower readings on the plate end of the plate resistors. The 6.3V should read about 7-point-something volts off-load also.

The neon should light (takes a long time to decay without warm tubes in!) and should have 55-65 Volts on it.

Keith
"A waist is a terrible thing to mind"
Quote from: PRR
Ah, but that was 1999; we don't party like that any more.

Cainester

All things LA2a related
« Reply #43 on: December 10, 2004, 05:22:52 PM »
ok..
R29 368v
R34 271.1
neon 17.23
heaters 6.8

BTW  I had to put a 560pf cap for c13

SSLtech

All things LA2a related
« Reply #44 on: December 10, 2004, 05:30:58 PM »
that neon... is it lighting up?
"A waist is a terrible thing to mind"
Quote from: PRR
Ah, but that was 1999; we don't party like that any more.

Cainester

All things LA2a related
« Reply #45 on: December 10, 2004, 05:33:23 PM »
negative.

Cainester

All things LA2a related
« Reply #46 on: December 10, 2004, 05:35:01 PM »
I just gave it some juice from R4 zero adjust and if fired up..

Scenaria

All things LA2a related
« Reply #47 on: December 10, 2004, 05:40:40 PM »
whats the value across your neon?

Cainester

All things LA2a related
« Reply #48 on: December 10, 2004, 05:43:48 PM »
17.1 to 52.5 when zero adjust goes from nothing to all.
About mid sweep the voltage goes to 63, but the neon doesn't light.  It only lights when the R is about 65%

Scenaria

All things LA2a related
« Reply #49 on: December 10, 2004, 05:49:10 PM »
set your switch to GR and see if you can dial your VU in at O V.U. with the zero adjust...


might be about time to pop that T4 in there :)


Cainester

All things LA2a related
« Reply #50 on: December 10, 2004, 05:51:32 PM »
Yes it will and when it does the voltage across the neon is 52.7 and T4 pin 5 is 8.5

Scenaria

All things LA2a related
« Reply #51 on: December 10, 2004, 05:54:03 PM »
Rock-N-Roll

your numbers look good

drop that T4 in there  :green:

 :guinness:  :guinness:  :guinness:  :guinness:

BTW your neon value is a little low.. but so is mine.. still havent figured out why theres such a discrepency from one unit to another...

once the box heats up you will need to readjust the zero setting...

whats your email address?

Cainester

All things LA2a related
« Reply #52 on: December 10, 2004, 06:18:20 PM »
Scenaria, SSLtech, cayocosta, cjenrick, PRR, and NewYorkDave, you guys ROCK.  I have one fully functional LA2a.  It is hum free, and is sweet as molasses!! :guinness:.
I will post pictures soon.
Thanks to all
Caine
[cainester @@ aol}

Scenaria

All things LA2a related
« Reply #53 on: December 10, 2004, 06:46:29 PM »
congrats!

though a little smoke and fire might have been fun  :razz:

Cainester

All things LA2a related
« Reply #54 on: December 13, 2004, 03:45:31 PM »
Ok, I used my LA2 this weekend and WOW! What tone..  What balls..  I only have one problem.  It will not limit.  If I connect a pot and vary it, there is no differenct in the slope of reduction.  I can use a standard 5k lin pot right?  I also notice that when I swithc to limit, the resistance at the pot falls to approx 0. Should that happen?

cayocosta

All things LA2a related
« Reply #55 on: December 13, 2004, 03:57:07 PM »
Waiter - check please.

gyraf

All things LA2a related
« Reply #56 on: December 13, 2004, 04:02:14 PM »
There is very, very little difference between the comp and limit modes of the LA2A.

Calling it limiting is a huge exaggeration..

Jakob E.
..note to self: don't let Harman run your company..

cayocosta

All things LA2a related
« Reply #57 on: December 13, 2004, 04:09:15 PM »
With R7 at 1k I didn't notice any difference between limit and compress but with R7 at 2.7K it appears to just compress a little more in limit mode.

Cainester

All things LA2a related
« Reply #58 on: December 13, 2004, 04:09:31 PM »
Quote from: "cayocosta"
Waiter - check please.

Awww Maaannn :sad:
Ok,
So maybe I didn't think through the 0 ohms too long! :oops:
But, I thought the limit was brick wall.  If it's not, then it functions correctly.

Cainester

All things LA2a related
« Reply #59 on: December 13, 2004, 04:30:23 PM »
One last question.....
For today :wink:

The limit / compress switch...
Does closed = compress and open = limit?


 

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