00100	We would like reliable quotes on prices and time to execute some
00200	changes to our 3100 Cohu TV camera (with 6000 series preamp).
00300	For our decisions, we would like the costs itemized; any specs
00400	in question should be called to our attention and made precise.
00500	
00600	Conversion to Si vidicon or plumbicon
00700	We are investigating purchase with Amperex (Phillips) of special
00800	selected tube with high signal current, 1500 to 2000 na.  Anti-
00900	comet tail gun is available with either tube.  Our decision is
01000	not made yet.  The plumbicon has good uniformity of surface but
01100	poor red response (which is important to us for color and for
01200	our HeNe laser triangulation expt).  The Si vidicon has high
01300	sensitivity and good spectral range.  We are uncertain about
01400	the uniformity of the tube.  We could accept a very few defects
01500	and some smooth shading as in a vidicon.  But random small-amplitude
01600	variation from element to element is damaging.
01700	
01800	We want the following mods:
01900		preamp-modified or new preamp (perhaps selected) with
02000		lowest possible noise current.  Bandwidth 6-7 Mhz.
02100		to accomodate input signal in range of 1500-2000 na
02200		without clipping.  Output range 1 volt (negotiable).
02250		2000 na is video beam current for selected tubes.
02255		The current may be larger during retrace, but that
02260		is not used for a signal.
02300	
02400		target voltage stabilized for plumbicon or si vidicon.
02500		modifications for anti-comet-tail gun.
02600	
02700	We will need to replace auto target control with filter/iris
02800	control.  Do you have any suggestions on available devices.
02900	Is there a tunable neutral density filter or continuous paired
03000	wheel?
03100	
03200	When we arrange to make the mods, we would like the camera in
03300	action again as soon as possible to minimize the break in 
03500	research here.  Please advise how we should ship to minimize
03600	transit time and how long the work will require.