I seem to recall that the heat sink on my Sinclair ZX-81 was pretty big, and that it had a "spring" that transferred heat to the metal paint on the inside of the case. Maybe if you put that large of a heat sink on the voltage regulator (7805 IIRC) it will keep it cool enough.

Quote from: granz on Apr 25, 2026, 03:33 PMYep, I'm getting the same:

QuoteShipping not available
Your order cannot be shipped to the selected address. Review your address to ensure it's correct and try again, or select a different address.

You are probably correct about it being a tariff issue. Maybe holding off for a while until other countries cut back on their tariffs on U.S. products, and then we can cut back on products from them.

Quote from: Chris Savage on Apr 25, 2026, 09:40 PM

Quote from: granz on Apr 25, 2026, 03:33 PMYou are probably correct about it being a tariff issue. Maybe holding off for a while until other countries cut back on their tariffs on U.S. products, and then we can cut back on products from them.

There are Tindie stores I have previously purchased from that are not shipping to the U.S. currently (some are in the U.K.) because of the tariff issues.

Well, I got these 2 items.... more then wanted to pay, but no other options....
https://www.ebay.com/itm/306717973814
https://www.ebay.com/itm/177966875115

Will find one of these to replace the 5v regulator.... the one in there gets REALLY hot, so better be safe than sorry, I'd get it on there but $6.99 + like $8.xx shipping is ridiculous....
https://www.ebay.com/itm/305400148473

Quote from: Chris Savage...I'm considering putting in an offer on the two Apple PCs, but not sure they'll accept what I would offer. I guess we'll see.

Put in the offer, the worst that can happen is that they refuse the offer; and they might just accept. I've accept two "extremely low" offers on antique computers because I was willing to let them go for low to get them to the right person.

Quote from: granz on Apr 25, 2026, 03:33 PMYep, I'm getting the same:

QuoteShipping not available
Your order cannot be shipped to the selected address. Review your address to ensure it's correct and try again, or select a different address.

You are probably correct about it being a tariff issue. Maybe holding off for a while until other countries cut back on their tariffs on U.S. products, and then we can cut back on products from them.

Quote from: Chris Savage on Apr 25, 2026, 09:40 PM

Quote from: granz on Apr 25, 2026, 03:33 PMYou are probably correct about it being a tariff issue. Maybe holding off for a while until other countries cut back on their tariffs on U.S. products, and then we can cut back on products from them.

There are Tindie stores I have previously purchased from that are not shipping to the U.S. currently (some are in the U.K.) because of the tariff issues.

Crap....... was hoping for $35 vs $50......

Quote from: Chris Savage on Apr 25, 2026, 09:48 PMMy wife and I went to an Estate Sale this morning for a former classmate of hers who has lived in Italy for years. That person's mother recently passed and she's selling off most of the belongings left behind. In the basement were two Apple computers. One looks to be an original Apple II with two 5-1/4" floppy drives. I was told to "make an offer", though I hesitated due to the price tag on the other vintage computer, what appears to be an Apple IIc, listed at $150.00.

There was a Commodore 64 box there which looked brand new, but when I asked if it was for sale, I was told it was sold already. Figures...I'm considering putting in an offer on the two Apple PCs, but not sure they'll accept what I would offer. I guess we'll see.

Good luck!

My wife and I went to an Estate Sale this morning for a former classmate of hers who has lived in Italy for years. That person's mother recently passed and she's selling off most of the belongings left behind. In the basement were two Apple computers. One looks to be an original Apple II with two 5-1/4" floppy drives. I was told to "make an offer", though I hesitated due to the price tag on the other vintage computer, what appears to be an Apple IIc, listed at $150.00.

There was a Commodore 64 box there which looked brand new, but when I asked if it was for sale, I was told it was sold already. Figures...I'm considering putting in an offer on the two Apple PCs, but not sure they'll accept what I would offer. I guess we'll see.

Quote from: granz on Apr 25, 2026, 03:33 PMYou are probably correct about it being a tariff issue. Maybe holding off for a while until other countries cut back on their tariffs on U.S. products, and then we can cut back on products from them.

There are Tindie stores I have previously purchased from that are not shipping to the U.S. currently (some are in the U.K.) because of the tariff issues.

Yep, I'm getting the same:

QuoteShipping not available
Your order cannot be shipped to the selected address. Review your address to ensure it's correct and try again, or select a different address.

You are probably correct about it being a tariff issue. Maybe holding off for a while until other countries cut back on their tariffs on U.S. products, and then we can cut back on products from them.

Quote from: Jeff_T on Apr 25, 2026, 10:17 AM@Chris Savage have you had chance to try it yet, I'm hoping things are right now.

You cannot view this attachment.

I got home last night and confirmed that these are the two kits. Sadly, I was so tired from a 40 hour week that I didn't do much of anything. I took these photos and meant to post them, but fell asleep. 

I will test them tomorrow. Today we did our shopping trip and now I'm trying to find some decent FreeCAD tutorials.

Quote from: granz on Apr 19, 2026, 09:58 PMI don't know - it seems that it would be better to just buy a replacement (https://www.vretrodesign.com/products/vla81-zx81-ula-replacement - and it has 13 5-star reviews) rather than trying to build your own.

Plus it always bothers me when someone produces a document that has a large percentage dedicated to "not my fault" disclaimer legalese.

Do me a favor? Can you put in your info in there, like you was buying one, minus payment info, and see if it accepts your address?  It says cannot ship to my address. Wonder if it's a terrif thing??