Let me try one more time lol. The 56 and 58's I am talking about are identical to 1578's except without perforated plates. Same metal supports at the top, same bottom mica. Many of the older Melz have oval micas or mica supports at the top, those are not what I am describing here lol.
![58 Melz solid plate.jpg](https://www.head-fi.org/attachments/3770990/)
The first photo is a 58 and you can see the solid plates better than on my photo of the 56. What I am not talking about are these:
https://www.ebay.com/itm/1pc-MELZ-6...202481?hash=item2af83a6331:g:QNkAAOSwoS9fvnB1
I have them, I have heard them, not the same thing. I sent a sample of a 58 solid plate to five people on here including @bcowen,@Ripper2860,
@JKDJedi,
@FLTWS, and
@sam6550a. All but Sam had one of my amps with which to check out the tube and I hope to get him a loaner amp in the next couple months. All reports on the tube were fairly positive and many of these guys have the 63 perforated plates and other 1578's. I do not call this a 1578 because of the plate difference but that is the only difference.
If you are able to find these, PM me and I will make it worth your while. There is one version on EBAY right now but they do not have shiny plates, and they do not even have a Melz logo, I bought one and it looks like someone has added or reattached the metal base so I do not recommend them.