Send an e-mail to Accuphase. They will answer you.
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Thanks T-bone. You mean the boards manual says it can not be used with the dg-28 and therefore the information in the catalog is incorrect?
Sorry I am still confused as there shouldn't be any reason you can't use ai-ad1. What am I missing? I would very much like to try it but don't have the analog disc option board. Thanks.
The Accuphase grid of compatibility says the AI-AD1 is NOT compatible with the DG-28. The AI-AD1 manual says it is is only applicable for the DC-300 and DC-330. Therefore the compatibility grid which I linked to and the manual of the option board agree.
I have seen on the DG-28 manual that it says any option board listed there (including the AI-AD1) can be used.
I cannot offer you any reasoning for why they say it cannot be used in one place and it can be used in another. I would suggest you wait for Accuphase's response to your email. I have found them to be responsive in the past.
Thanks for the replies guys. What Nolitan just mentioned here is most likely the reason Accuphase does not see it fit to support it as an option board...
Here is more information I got from a forum from Taiwan:
ChrisH: I used to own Accuphase DG-28 along with AI-AD1(mm/mc phono stage) and AO-B2(balance output) many years back.No problem for you to use AI-AD1 as an analogue input and feed into your line Preamp via balance output.
Note that your analogue signal will be RIAA equalized and amplified through AI-D1 initially and then digitalized by DSP chips, digital signal goes to balance output board incorporates with 20-bit DAC and restores to analogue signal. The signal path seems weird or brings owls to Athens but you may have some fun to adjust the equalization other than RIAA.