# multi meter

#### beatsal

Joined Jan 21, 2018
169
I have an old Bell and Howell Schools ( De vRy Institute) multimeter. 3 or 4 wires are disconnected, don't know where they connect. Please help - Thanks

#### spinnaker

Joined Oct 29, 2009
7,835
You are going to have to give a WHOLE lot more information that that. For starters what 3 or 4 wires are disconnected. Post a photo.

And is it 3 or 4 wires? You mean you are not sure??

#### JohnInTX

Joined Jun 26, 2012
4,280
You are going to have to give a WHOLE lot more information that that. For starters what 3 or 4 wires are disconnected. Post a photo.
..And be sure that photo includes the model number and the insides if possible. IIRC B&H schools and CIE, too, had students build a VTVM (vacuum tube volt meter) as one of their projects for use later in the course.

#### beatsal

Joined Jan 21, 2018
169
3 wires R, BL, Y as in pic 3 pics attached

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#### AlbertHall

Joined Jun 4, 2014
10,388
Is there a battery holder in the other half?
Could that be where the wires are from, someone disconnected the wires to separate the two parts of the meter?

#### beatsal

Joined Jan 21, 2018
169
Could not see a battery holder; there is a 1.5V battery though which is soldered. The yellow wire seems to have been connected to the battery. The Red and black could also be from the battery

#### spinnaker

Joined Oct 29, 2009
7,835
The battery was to measure resistance from what I recall. Odd that it is soldered in place. I am sure it will need to be replaced.

Joined Jan 15, 2015
5,646
Below the trim pots and below the meter movement terminals I see what looks like two brown colored transistor sockets. Take a look at this old thread which will get you to a schematic. There is also this.

This should be a schematic of what you may have.

Ron

#### beatsal

Joined Jan 21, 2018
169
Tried but could not locate vendor for 2N369. Any help appreciated - Thanks

Joined Jan 15, 2015
5,646
The ones I saw on Ebay aren't there anymore. Old germanium transistors are hard to fine.

Ron

#### beatsal

Joined Jan 21, 2018
169
The ones I saw on Ebay aren't there anymore. Old germanium transistors are hard to fine.

Ron
Thanks. So wonder what to do; go with another transistor or just give up.

Joined Jan 15, 2015
5,646
You can try and find a substitute but good luck on that note. I don't have a viable solution to suggest.

Ron

#### Wolframore

Joined Jan 21, 2019
1,786
Be careful those old germanium ones vary quite a bit. sometimes have to go through a bunch to find a good one. The hfe varies a lot on them.

#### crutschow

Joined Mar 14, 2008
25,392
A 2N404 may work.
I think they are more commonly available.