Pars

Unclear. Going back in the thread, I had posted this, as the schematics I have don't appear to have this fix in place. Shortly after this post, you released new gerbers including all fixes. However, there was an error with a 10K resistor connecting to a device emitter instead of the base. Not sure whether the fixes mentioned were in only referring to this or also included the servo fix. I don't see a pair of 15K resistors, as were used in the CFA2 fix, on the gerbers.

@kevin gilmoreDo the current gerbers (cfp3rs and cfp3rss) have the servo/current mirror correction done to the CFP2 on them? Or don't they need it? Thanks!

Does anyone have a pair of CFP3 boards they want to get rid of? Also, I see two sets of Gerbers: cfp3rs and cfp3rss. Is the difference the revised servo/current mirror? I'm assuming the cfp3rss is the most recent? Thanks!

Happy Birthday Nate!

Yes, not cheap, but considering it is a matched quad, approx. $11@. And generally unobtanium. The diyaudio store charges $39 for a similar matched quad of the Linear Systems devices (2 N, 2 P).

^ Reputable seller of genuine devices.

Is the one on the right a 2U? Looks to be 1U from the pic. The SlimLine have 10mm sides which would be sufficient for heatsinking for many applications.

Happy Birthday Craig!

The LSJ109 is (was?) a dual JFET, but not in the same package as the Toshibas were. For thru-hole, it is available as a TO71 can package with 6 leads. It seems as though these are either discontinued or just not available. Your alternatives are to use the LSK489 / LSJ689, or use the singles. The 489/689 is what I have used. The diyaudio store sometimes has the singles: https://diyaudiostore.com/collections/parts/products/linear-systems-matched-jfets

Sound-wise, any of the JFET options are preferred. If you can find them, the Toshibas would probably be preferred (2SJ / 2SK parts). I have used the Linear Systems LSK489 / LSJ689 and didn't notice a difference from the Toshiba devices, but I have read that some prefer the Toshiba. The BJT devices (2SA/2SC or the THAT part) to me don't sound as good. Not bad, but not as good. And that is with 10K pots. I think the 2SA / 2SC sounds a little better than the THAT part, but not up to the level of the JFETs.

When I look at the KBP201G on mouser.at, it shows 429 available (same as Mouser US)?

How about 621-KBP201G (Mouser PN). Haven't tried it but same specs. These bridge rectifiers are common parts and shouldn't be a problem to replace. Also a Rectron MDA201G would be another one to look at. 2A 100V bridge rectifier in an appropriate case/footprint and pinout.

Happy Birthday Naaman!

This post from Søren in the Circlotron thread is useful for testing a GRHV. EDIT: Per Soren, note that these instructions are for the Circlotron, so differ from a GRHV somewhat. For the initial check, I was getting 0.5mA; Soren said maybe 1mA. For the 2nd CCS, I was getting 1.4mA. These will depend upon your particular DN2540s. The current limiting CSS he notes is not applicable on the GRHV, so ignore that portion. My boards both worked fine. The paralleling of the gain resistors (2 x 390K for a 400V GRHV) worked quite well. I put a 100K in parallel with the series string for a regulated output of ~55Vdc. Make sure you use a variac for this to limit the input voltage.

We had a Fry's in Downers Grove (Chicago suburb). We still have a Micro Center, also in Downers Grove I believe. It seems to be doing well.

I managed to get some C2M1000170D from Rochester Electronics (part of Arrow or Allied?) awhile back, but they are out as well now.

They looked like they were going out of business for at least the last 2 years... Strange store, but kinda fun to go to. Shit for electronics components though. Lots of NTE. I did buy soldering equipment from them though. Hakko stuff in particular. And some test leads.

Several have built it (and love it).

Happy Birthday Dan!

Happy Birthday Al!

Thanks. I already have the installer. I've tried that link before, and when you go to it and try to download, it wants to open iTunes (of all things), then says the requested item is not available in the US store. Probably doing something wrong, but at any rate, already have a Mojave installer.

Thanks for the input guys. This Mini can run Catalina, but apparently not Big Sur, so it has started. I'll just upgrade the main SSD to Mojave, probably get some other sort of external for backups, and go from there. For backups, I would think an HDD MIGHT be more reliable long term than an SSD? And I've only ever used Samsung SSDs. I think the current 500G one is an 850 EVO? And that is a great price on the Crucial! But, I think I will buy a Seagate external 6TB 7200 rpm HDD for $127.

My 2012 i7 Mac Mini is still my main computer as it does pretty much all that I need (16G RAM, 500G SSD + 1T HDD). It is currently on High Sierra due to 32 bit support. Several apps that I use are 32 bit and can't be easily/cheaply upgraded to 64 bit: Eagle ($$$), Office 2011 and 2016 (I still prefer older office versions), etc. My wife uses Turbo Tax and this year the pricks require Mojave as the minimum version. I know that Mojave supposedly supports 32 bit apps, but does it really? Someone suggested that I might want to install it on a separate drive to test before doing so on the main SSD. Any recs for an external drive (SSD?) of probably 2T to use for this (as well as backup/Time Machine duties)? The original 1T HDD is partitioned; 1/2 used for additional files (not very full) and the other 1/2 for Time Machine. The SSD was a big boost in performance, so I don't think I want to go back to a HDD as a boot drive. Thanks!

Happy Birthday Colin!