DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 16 Jan 2018, 10:43

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Test Equipment Help
PostPosted: 09 Oct 2014, 11:52 
Offline
Project Author
User avatar

Joined: 06 Apr 2009, 10:08
Posts: 1373
Location: US Pacific Northwest
Ok folks, I need some help. I have recently acquired an AC millivolt meter; a Leader LMV-87A. It looks like this one here.
Attachment:
eqp-lmv-87a_lg.jpg

I need to know the specs of the meter so I need a manual or at least a schematic. You'll also notice that there is both an input (obviously) and an output. As such, I would like to know what are the transfer characteristics of the piece of equipment.

I need at least a schematic; but a schematic and a manual would be even better. Does anyone happen to have one stashed away? It would be a great help.

Thanks


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.


_________________
Matt
It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


Top
 Profile  
 
 Post subject: Re: Test Equipment Help
PostPosted: 22 Jan 2015, 12:46 
Offline

Joined: 05 Jun 2012, 13:10
Posts: 196
Location: Darboy, WI, USA
Does this help at all?:
http://www.radiomuseum.org/r/leader2_ac ... m_181.html

http://www.technicalaudio.com/pdf/Marti ... atalog.pdf

_________________
Thanks,
Ross in Wisconsin


Top
 Profile  
 
 Post subject: Re: Test Equipment Help
PostPosted: 22 Jan 2015, 21:36 
Offline
Project Author
User avatar

Joined: 06 Apr 2009, 10:08
Posts: 1373
Location: US Pacific Northwest
Yes, somewhat. The 181 has a 1V output for "full scale" with a 600Ω output. I guess I can make some assumptions about the 87V and do some experimenting. I was just hoping that someone, somewhere had a schematic.

Thanks Ross.

_________________
Matt
It's all about the Glass!
http://www.CascadeTubes.com
Cascade Tubes Blog


Top
 Profile  
 
 Post subject: Re: Test Equipment Help
PostPosted: 22 Jan 2015, 22:48 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 3502
Location: Arizona, USA
Hi, I don't have the info you need.....but a caution on use of them. It appears the one you have is set up (with the input and output terminals) like ones I have. I have both a B&K and Heath kit ones. When you measure across a component in circuit the ground terminals are not at ground level. They are floating. If something else is attached to it ..... you can almost always smoke something.

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
 Post subject: Re: Test Equipment Help
PostPosted: 22 Jan 2015, 23:58 
Offline
User avatar

Joined: 08 Aug 2009, 03:11
Posts: 2128
Location: Chilliwack, BC
gofar99 wrote:
When you measure across a component in circuit the ground terminals are not at ground level. They are floating. If something else is attached to it ..... you can almost always smoke something.


Ah! So that's what I did to my Heathkit one :blush:

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


Top
 Profile  
 
 Post subject: Re: Test Equipment Help
PostPosted: 23 Jan 2015, 08:27 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 3502
Location: Arizona, USA
:eek:

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy