[QuadList] QuadList Digest, Vol 48, Issue 7

[Kenneth Zin]

Folks here is what to do to adjust the video head air switches, see PDF attached.
Ken Zin

--- On Fri, 6/1/12, quadlist-request at quadvideotapegroup.com <quadlist-request at quadvideotapegroup.com> wrote:

From: quadlist-request at quadvideotapegroup.com <quadlist-request at quadvideotapegroup.com>
Subject: QuadList Digest, Vol 48, Issue 7
To: quadlist at quadvideotapegroup.com
Date: Friday, June 1, 2012, 10:00 AM

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Today's Topics:

   1. Re: Ampex Quad VTR Airflow Requirements (Roger Brett)


----------------------------------------------------------------------

Message: 1
Date: Fri, 01 Jun 2012 12:57:25 -0400
From: Roger Brett <rcbindy at comcast.net>
To: Quad List <quadlist at quadvideotapegroup.com>
Subject: Re: [QuadList] Ampex Quad VTR Airflow Requirements
Message-ID: <4FC8F475.4020106 at comcast.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Thanks Don, very helpful!!!

On 6/1/2012 10:10 AM, Don Norwood wrote:
> Hi Roger:
>
> The air supply requirement for VR-1100/1200/2000 when equipped with the
> venturi update is between 50 & 55 psi at just under 1 scfm. When
> properly adjusted, the head air warning will come on above 55 or below
> 50 psi, and the head air interlock will cut out below 40 psi. Air supply
> must also be dry and oil-free.
>
> For a single machine, a compressor that can deliver 1 scfm at 100 psi
> gives a comfortable cushion and a reasonable cycle time on the
> compressor when using a properly sized tank. Obviously, there are a
> number of variations of scfm/pressure/tank size that will yield
> acceptable results.
>
> The original Ampex and RCA approach was to use a compressor that was
> just slightly oversized, and it ran continuously with a relief valve.
> That works too, but I much prefer a "central air" design, even when
> using a single machine. Beware of cheaper oilless compressors which tend
> to run very hot and are not designed for continuous duty. My preferred
> brand is Gast, and you'll find a large variety of compressors if you
> check their website. The rocker style can be used for a single machine,
> but I still prefer the piston style and their higher output. Quietness
> (a relative term!) may also be a consideration depending on your situation.
>
> If you have any specific questions, let me know.
>
> Don Norwood
> Digitrak Communications, Inc.
> www.digitrakcom.com
>
> ----- Original Message ----- From: "Roger Brett" <rcbindy at comcast.net>
> To: <quadlist at quadvideotapegroup.com>
> Sent: Friday, June 01, 2012 1:11 AM
> Subject: [QuadList] Ampex Quad VTR Airflow Requirements
>
>
>> Hi,
>> Does anyone have info regarding air system requirements for the
>> typical Ampex VR series quad machine? I'm planning the air supply
>> system for one fairly soon.
>>
>> It's been quite a while since I maintained one of these, and I don't
>> seem to have this data on file.
>>
>> I don't have physical access to the unit yet, but besides the air
>> bearings on the head, I believe it has a venturi system to generate
>> vacuum for the guide. This aspect would of course increase the flow
>> requirements.
>>
>> Data I'm trying to get:
>>
>> - Max (worst case) CFM of airflow needed for bearings and venturi
>> combined
>> - Nominal air pressure needed at the head bearings for proper operation
>>
>> Any help would be appreciated!
>>
>> Thanks,
>>
>> Roger Brett
>>
>> Please trim posts to relevant info when replying.
>>
>> Change subject to reflect thread direction. Thanks.
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>
>
> Please trim posts to relevant info when replying.
>
> Change subject to reflect thread direction. Thanks.
> _______________________________________________
>
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>



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End of QuadList Digest, Vol 48, Issue 7
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