Leader LV-76A …or, is it? - Page 1
Forum section: electronics / testgear

author: W3KW
author_rank: Contributor
timestamp: December 01, 2022, 03:13:36 am
content: 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.WesW3KWI don’t yet understand why the forum randomly rotates my photos. Sorry about that.

author: Writerone
author_rank: Newbie
timestamp: January 12, 2023, 09:05:07 pm
content: 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.

author: Writerone
author_rank: Newbie
timestamp: January 12, 2023, 09:38:45 pm
content: Quote from: Writerone on January 12, 2023, 09:05:07 pmI 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.

author: oz2cpu
author_rank: Frequent Contributor
timestamp: January 12, 2023, 10:01:10 pm
content: wow that is so nice the older tube based one..in case you like to see mine, the a bit later, transistor based versionLeader LMV-89 from 1970 to 1975https://youtu.be/6lmpMzdiLUU

author: william_b_noble
author_rank: Newbie
timestamp: October 27, 2024, 04:34:59 pm
content: since at the top of this topic someone posted that they had found a schematic for a LV-76B, can you tell me where you found it.... I have a B and a resistor is not connected, I'd rather use a schematic than work backwards and then guess and hope .....update - I found it on BAMAhttps://bama.edebris.com/download/leader/lv76b/Leader%20LV-76B%20Instruction.pdf

author: Writerone
author_rank: Newbie
timestamp: October 27, 2024, 06:08:45 pm
content: That might have been me. BAMA is the Boat Anchor Manual Archive,https://bama.edebris.com/.

author: william_b_noble
author_rank: Newbie
timestamp: October 27, 2024, 11:23:41 pm
content: Thank you, I found the manual a few moments before you posted - And, I was able to repair the meter, I found two broken connections, one on a 19.5meg resistor one a wire (that was really hard to find) - I ended up putting 5VDC on the input and following it until it disappeared at the divider, and a tug on the wire from the mode (AC/DC etc) switch to the range switch revealed the problem when the wire just pulled out. It's a nice unit. it will sell to pay for more fun test equipment ....