[BC] Cinema Engineering line elvel meters, was A What's it?

[Alan Alsobrook]

Ok, After having been at the shop and Now noticing the second set of 
holes in the panel, it's very likely those are not the original meters.

Looking very closely at the meters inside the meter face I see the 
following:
Model 450   49-4193    Type A    2
I put them on the bench and got the following test results,
Z was well above 2K ohms (the limit of my chepie Z meter)
both meters tracked each other perfectly. The ballistics are pretty 
fast. At the +4db setting they both read 0 at exactly 4.00db @ 1 kHz
after that the meters started reading higher up to where they read zero 
on the +19db scale at +16.64 db, for an error of +2.36db On frequency 
response they started showing rolloff at about 10 Khz and were down by 
the magic 3db @ 26.983 KHz.

The only problem noted is that the left hand attenuator seems to be a 
bit noisy and probably needs to be cleaned.

You know that's not bad for a set of meters that may be older than me.

Phil Alexander wrote:

> On 7 Nov 2005 at 6:01, Milton R. Holladay Jr. wrote:
> 
> 
>>On the VU panel, Phil, you're not doing too much better. I believe that
>>you'll find that those are Triplett meters, which had non-standard
>>sensitivity, IIRC, 10 dB more sensitive.
> 
> 
> Yes, I suppose Triplett is a possibility. If anyone can the 32167 19
> number stamped on them, that would be conclusive. However, it is
> clear the original meters were replaced with these quite some time
> after original manufacture, which, from the type of wire used I'd
> place as either late '30's or late '40's.
> 
> Too bad the original meters weren't there. Those Weston VU meters
> were used on all the WE equipment I ever saw as well as most of the
> top of the line gear from the immediate post-war period.
> 
> I'm curious, how did they get anything resembling a normal ballistic
> from a meter with greater sensitivity? I'd also think the impedance
> would be quite a bit lower.
> 
> IIRC the standard VU meter had an impedance of 3900 ohms as a bare
> device and the meter attenuator had an inpedance of 7200 ohms for
> +4 and above.
> 
> It is clear from the tag on the back that Plough Corp. owned them once
> upon a time.
> 
> 
>>(I have a factory sheet on these somewhere.) Cinema Engineering, yes.
>>What will it take to part you from them, Alan ?
> 
> 
> 
> Phil Alexander, CSRE, AMD
> Broadcast Engineering Services and Technology 
> (a Div. of Advanced Parts Corporation) 
> Ph. (317) 335-2065   FAX (317) 335-9037
> 
> 
> 
> 
> 

-- 
Alan Alsobrook CSRE AMD CBNT
St. Augustine Fl. 32086 904-829-8885
aalso at Bellsouth.net