[QuadList] Smith splicer, etc.

[David C. Crosthwait]

In regard to the VR 1000 setup (attached file), I failed to mention  
the following: Notice the video level of 1.4 volts. peak-to-peak (or  
station standard). In other words, pick your standard. Before the days  
of a cal. pulse and agreed upon deviation.

David



Quoting "David C. Crosthwait" <david at dcvideo.com>:

> Bill,
>
> There was the VR 1000 modulator spec. (attached) for LBM that I've
> seen, with variable levels in between. Just think about this: You had
> to get the modulator frequency and the deviation right. Yes, the
> "low-sync high-video" issue is a challenge. This settled down around
> 1963 or so, in my experiences. Also note that Allen mod/demod. had a
> variable emphasis for "experimental purposes".
>
> At one time, I had some TR 60's with a mod for variable head switch
> placement. But this has nothing to do with your issue.
>
> The AVR-2 color low-band factory modules are rare. I've never seen a
> modified one that worked right for mono or color. I've also seen some
> people xfer LBM on an AVR-3 with poor results.  The AVR-1 is the only
> machine that has the right selection of filtering, EQ matching, and a
> tolerance in the TBC (buffer) to get past these issues, in my opinion.
> And this includes noise, bent sync, sloped sync/video, hum, and other
> unusual artifacts that shouldn't allow a tape to play at all. Add to
> this are our customized modules to deal with the even more unusual
> (RCA labs color etc).
>
> Can't help you with the TR 600 (itself) problem except to say that
> filtering has
> a lot to do with these type issues and this was not RCA's strength, at
> least in that model. I at one time had two 600A's.
>
> In regard to the 7.5 IPS issue and LBM, here is my experience: The
> three networks never used 7.5 I.P.S for anything. CBS for example, was
> on LBM for the Sullivan shows right up till Sept. 65, when color
> started and at that time, the switch to HBC. Another example was ABC.
> The Welk series did not go to color till '65, and then HBC. All
> previous recordings in black & white were LBM. NBC seemed to stay on
> LBC past '65 on the Deans and Andy Williams. The '63 Bing Crosby
> recordings (made for CBS) were actually done in a color studio at NBC
> but in black & white, LBM. All of these examples were at 15 I.P.S. The
> six VR-2000's at NBC Burbank were ordered up only because production
> producers demanded HBC (the TR 70's were not being delivered yet), and
> as it was a competitive thing with the other facilities i.e. TV City.
> But the NBC Burbank studio recordings named above seemed to have
> stayed on LBC, even when transistorized modulators (I suspect the
> TR70's or 2K's) were evident (the LBC moire almost totally disappeared
> then).
>
> David Crosthwait
> DC Video
> Archived Media Transfer and Re-mastering Services
> 177 West Magnolia Blvd.
> Burbank, CA. 91502
> 818-563-1073
> 818-563-1177 (fax)
> 818-285-9942 (cell)
> DCFWTX at AOL.COM
> DAVID at DCVIDEO.COM
> WWW.DCVIDEO.COM
>
>
>
>
>
>
>
>
>
> Quoting bill.spencer at northstarstudios.tv:
>
>> All,
>>
>>
>>
>> I am working on a recovery project and have had a splice part on me.  If
>> anyone knows of a Smith splicer or a 2" audio straight cut splicer in or
>> near Nashville that I could borrow for a few days please let me know.
>>
>>
>>
>> Also, some of these tapes were recorded with improper deviation in LBM
>> and the sync is low.  I can turn the demod level up so that the sync
>> locks and then run the video through a proc amp to bring it back to
>> normal, but it is still causing the MTBC in my TR-600 to have an
>> excessive amount of jitter.  Does anyone know of some old tricks to make
>> a TR-600 play LBM better?  Was there ever a LBM demod for the AVR-2 or
>> has anyone successfully modified one?  I have two extras so I have
>> something to experiment with.
>>
>>
>>
>> Tapping the well of all wisdom for all things quad, I thank you in
>> advance.
>>
>>
>>
>> Bill Spencer
>>
>> RF Engineering Supervisor
>>
>> NorthStar Studios, Inc.
>>
>> 3201 Dickerson Pike
>>
>> Nashville, TN 37207
>>
>>
>>
>> Phone 615.650.6000 ext. 6610
>>
>> Cell 615.445.5616
>>
>> Fax 615.650.6027
>>
>> email bill.spencer at northstarstudios.tv
>> <mailto:bill.spencer at northstarstudios.tv>
>>
>>
>>
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