[QuadList] AMPEX TBC-900 for the VR-3000B

[Dennis Degan]

		On Mar 25, 2016, at 12:01 AM, Don Norwood wrote:

> Trying to find some additional information on the Ampex TBC-900 that was developed exclusively for the VR-3000B.  In essence, it contained almost all of the signal system from the AVR-2, so it was far more than a typical TBC. When used with the VR-3000, RF from each channel was routed to the unit, bypassing the 3000's internal EQ, switching, demod etc.  All of those functions were performed in the TBC-900 ahead of the actual TBC function.

		I wonder:

	Really?  It bypassed the EQ and demod of the machine?  That’s surprising, especially since I’m pretty sure the VR-3000 is equipped with switching, EQ, and demod, so why bypass them?  All the VR-3000 needs is a direct baseband TBC designed for switched video.  I’d also like to know how many functions the TBC is doing.

			Dennis Degan, Video Editor-Consultant-Knowledge Bank
					    NBC Today Show, New York


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