CJ

Re: UTC LS-51
« Reply #20 on: June 10, 2020, 03:25:14 PM »
Doug, do you still have your LS-51?

If so could you measure DCR forboth primaries?  Thanks!  cj
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


rackmonkey

Re: UTC LS-51
« Reply #21 on: June 11, 2020, 11:03:00 AM »
Anyone have an LS-51 around they can measure up for Ceej?

Really curious about the lam material. Cobalt imparts a copper hue a lot like that to alloys. Just look at the color of a cobalt alloy drill bit intended for metal boring.  Manganese has a coppery color by itself, but isn’t that obvious in common alloys (I’m thinking aluminum like 3000 series alloys). Wonder if cobalt is what gives them that look?
« Last Edit: June 11, 2020, 11:15:27 AM by rackmonkey »
Whether you think you can or you think you can't, you're probably right.

EmRR

Re: UTC LS-51
« Reply #22 on: June 11, 2020, 01:48:35 PM »
Doug, do you still have your LS-51?

If so could you measure DCR for both primaries?  Thanks!  cj

I've got few of them, but not easy to get to.  I think I posted that info in one of the comprehensive transformer spec threads, Ian's perhaps? 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

shabtek

Re: UTC LS-51
« Reply #23 on: June 11, 2020, 03:36:54 PM »
Dcr of 1k for each half
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

CJ

Re: UTC LS-51
« Reply #24 on: June 12, 2020, 05:56:36 AM »
thanks Shabtek! that is what i got, 1,045 ohms,


we had to compute the coef. of inductance as this lam was not in the book.

after we get the inductance constant , we can get the permeability  of the core material.

note that the turns ratio would indicate that this transformer is closer to 44K to 600 ohms instead of 30K,  so catalog specs do not always match reality, and this is more common than you would think.

and 24 dbm is really pushing it, as that spec appears to be taken at the saturation point of the core.  (12 KG for most 50/50 alloy)
« Last Edit: June 19, 2020, 12:24:01 AM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: UTC LS-51
« Reply #25 on: June 19, 2020, 12:18:34 AM »




print>

« Last Edit: June 19, 2020, 12:25:49 AM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: UTC LS-51
« Reply #26 on: June 19, 2020, 12:28:50 AM »
winding print>

If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: UTC LS-51
« Reply #27 on: June 19, 2020, 12:43:57 AM »
and a new build chart with "#39" wire instead of the incorrect "#38"
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

rackmonkey

Re: UTC LS-51
« Reply #28 on: June 19, 2020, 02:20:08 AM »
Build chart!

You've outdone yourself. Go smoke a fatty. You've earned it!  ;D
Whether you think you can or you think you can't, you're probably right.

 

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