Leader LV-76A …or, is it?

[W3KW]

I own, what the label reads anyway, a Leader LV-76A VTVM. It really seems like a quality meter and is very accurate for an analog machine. I spent some time adding an internal fuse, new power cord, and basically cleaned and calibrated it. I was able to find a manual for the LV-76B, but only the schematic for the LV-76A. This is where a mystery has unfolded. The -A model schematic, which matches the label on the front of my meter, only has two tubes. The -B model has an extra 6AL5, or three tubes. My -A model meter has three tubes! What? That doesn’t match the schematic for -A model.

Does anyone own a -B or -A model and notice the discrepancy with the manual?

See photos.

Wes
W3KW

I don’t yet understand why the forum randomly rotates my photos. Sorry about that.

[Writerone]

I did a search equally confused because mine is a B and I'm seeing only two tubes. I wonder if the previous owner replaced the case, or if mine is heavily modified. I'll have to look for a 76A schematic as well because this doesn't seem to match the 76B directions I got from BAMA.

[Writerone]

I did a search equally confused because mine is a B and I'm seeing only two tubes. I wonder if the previous owner replaced the case, or if mine is heavily modified. I'll have to look for a 76A schematic as well because this doesn't seem to match the 76B directions I got from BAMA.

I did a little sleuthing, and it's pretty clear I have a 76A in a 76B case. The devices and values all align with a 76A schematic. Fortunately I just picked it up at an estate sale and don't feel like I was misled by the model number. If I can help in any way, let me know. I'm trying to decide if I should recap mine or just let it ride.  I thought I had more to work with, but I don't assume the procedures in my 76B guide apply to the 76A.

[oz2cpu]

wow that is so nice the older tube based one..

in case you like to see mine, the a bit later, transistor based version

Leader LMV-89 from 1970 to 1975

https://youtu.be/6lmpMzdiLUU