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The AD834's (500mhz)were used in the very first version VIM's. It was replaced on the later version 1994/1995 Vim (50-2035-02P) with the AD835 (250mhz). They are not interchangeable. There's a lot more needed for the AD834. The AD834 was bought back into the picture on the 03 board (50-2035-03P), this board was introduced around the time of the 8110. One is a voltage feedback the other is a current feedback analog multiplier (electronic gain control), but they are both quite sufficient for the bandwidth of the projector. VDC still uses the 02 boards in the their new Ultra's. the 02 boards have the AD835 (250mhz) chip. |
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