I.T.A LA 1B

[Geronimo Labrada]

Hi...some info about this animal????i'm about to turn on and see what's going on

 

[pucho812]

take more photos please. Would love to see some insides.

 

[Geronimo Labrada]

MORE PICS!!!!

 

[dustbro]

Can you please please please post a schematic (or some more detailed pics)?
I've been searching for over a year.

 

[mcfate]

I have the LA 1A, but no documents.  Try Phil at Retro Instruments, he may have something.

 

[lassoharp]

For all owners of this unit - all it takes is about several hours of time to draw out a schematic.  Job done.  Problem solved.   

And, you don't have to worry about whether some schematic on the web matches your unit, or whether there's any mistakes as can sometimes happen even on factory copies.

 

[SSLtech]

I don't really see how "because you drew it yourself" equates to "you don't have to worry about mistakes"...

Although I do agree with the main point of your post. 

 

[lassoharp]

Good point as far as personal mistakes.    That's where the forum can be of great assitance.  Post what you think is correct and allow the more advanced members to help correct any glaring errors. 

 

[emrr]

You'd think as many reverse engineered schematics as I've posted on the intertubes, that people would be sending me things like this to figure out.  Never happens, kinda surprising.  Guess people would rather wait for some free info to surface.  I'd have that thing drawn and redrawn in about 3 hours, test measurements within 4, probably more info than the official document.  Plenty of people here could do it. 

 

[tubologic]

As you don't give the tube complement I'm unable to check but I have the manual of the ITA AGC-1A Automatic Gain Control Amplifier which is also based on the classic 6386 circuit. (like STA-Level, Uni-Level, and many others...). As there might be some similarities, I ve included the schematic below. Hope it could be useful to someone.

 

[dustbro]

Tube list for the ITA LA-1A was:
v1-5749
v2-5749
v3-12ax7a
v4-12at7a
v5-12au7a
v6-12au7a
v7-12bh7a
v8-6al5
v9-oc2
v10-5y3

 

[Geronimo Labrada]

Hi
the tube list is this
v1 6386
v2 12ax7
v3 12bh7
v4 12bh7
v5 6al5
v6 5y3
5 transformers...

 

[Geronimo Labrada]

more pics

 

[Geronimo Labrada]

another pic

 

[Geronimo Labrada]

some first drws

 

[Geronimo Labrada]

2 drw

 

[Geronimo Labrada]

continuamos mas tarde