Get a load of this Deceptive add for a Gryphon Amp here on AG

I just don't see the issue here.  Although he certainly could have, and perhaps should have made that disclosure in the text of the ad, he has an excellent track record here, and made full disclosure of those issues in his confirming message.  Plus, is it a big deal (I don't know) that the voltage was changed to 120?  Many amps can be changed internally from one voltage to the other, so that doesn't seem like much of a big deal either, although perhaps it is more involved with Gryphon amps.  As for the warranty issue, from the comments above, it seems like Gryphon does not have a transferable warranty, period, so although it is important to disclose that, it does not seem to be tied to the "gray market" issue.

OP states ad was deceptive, later on the term shady was used. While original ad may have left pertinent information out, I still wouldn't call it deceptive or shady. A single email brought about full disclosure, the OP is out a single email. You should have private emailed seller about amending his original ad. no need to make this mix up public, the seller has good track record here. I've had any number of mix ups similar to this over many years, honest people sometimes make mistakes. If seller had no track record, I could more understand the public announcement.

As for converting 230v to US voltage, it's possible power transformer has multiple taps. Otherwise new US spec transformer or step down transformer (least preferable). And yes, these are grey market units, less value, no warranty and may be difficult to service here. But if no transferable warranty issue moot. Non-transferable warranty is an issue with me, whats the deal here! This is a business model offering only disincentive to purchase used, and brings into question long term reliability of their equipment. Why won't they stand by warranty regardless of owner, do they rate owners based on some investigation.

Gryphon/Accuphase etc will still work on the gear if there is no warranty as long as its not a "grey market" purchased product. You just have to pay for the repairs out of your own pocket.
They will not work on a grey market product period. Thats the difference between No Warranty vs Grey Market. This is common practice which Im sure almost all distributors of any brand will tell you.
The Seller amended his description many hours later at night. This was posted in the morning. There was no need for me to further communicate with him all that time later. After his initial email to me I told him I wasnt interested once the truth about the origin of the amp came out. Im not buying any product that will be refused service by the manufacturer. Im a gambler by nature but not when $10,000 - 15,000 is involved.
No further reason to discuss this topic as its no longer listed and many dont get the ramifications of buying a grey market product going by their replies.

I’ve been here since 1997 when AG began. It’s my understanding they’ve always  taken the position that we’re only owners, and you’re on your own. So tread lightly. 

Gryphon does not offer warranty to the second owner but, this seller will send it for service. Sending your amp to Denmark round trip for service can and will cost a bundle. 
Some ads are hard to believe but they can also be a real good deal.