Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
|
| Posted: Wed May 20, 2009 12:33 am Post subject: |
|
|
Hello
The differences are several. The earliest 9000s, a few dozen, were built with Thomson tubes driven at 40kv. in 1993 they switched to Panasonic tubes at 34kv, same hvps as the 8000. Due to reliability issues some of the Thomson units were retubed and the hvps could be traded in for 34kv. One can check the label on the hcps, a 40kv hvps probably indicates a Thomson set. The neckboards on a Thomson unit would have to be replaced to use Panasonic tubes, there was also a jumper on the backplane that had to be moved. Projectors with firmware below v2.0 had no viewing hour clocks. The 9500 rolled out with 34.9kv on Panasonic P19LCP09s and a better control board, similar to what is used in the Ultras. The 9000 would not scan below 30khz, causing users wanting to watch video sources to install line doublers or scalers; this was addressed in the 9500 which went to 15khz. The focus board was redesigned to give additional range for the 34.9 kv anode. HD10L lenses were standard, GT17s could be requested. There were several variations on the 9500 including a Hi-Scan unit for 152lhz and also a Dome unit with extended geometry capabilities. Electrohome decided it was easier to just put all the enhancements into one chassis which was the Ultra, introduced in 1999. A 9500 can be fitted with an Ultra HDM to enable 152 khz but I doubt that anyone here would need that.
So, depending on which 9000 you start with, you may need three tubes, three neckboards, a focus board, and an hvps. Lenses would depend on the screen size you intend.
.
|
|
