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Oooh, interesting! Would you mind showing some pics of the boards? //UFN

Package arrived just now Thanks again @MLA for running this GB! //UFN

Same here - no big hurry //UFN

Thanks @sorenb, looks like my math was correct. I built a PSU dummyload a while ago, so that's not a problem. If I have to start looking around for cheap EL34s for testing then so be it, but I was hoping I could maybe put my collection of Fluke meters to use instead

Been slowly plugging away at a pair of GG-boards for a while now and I'm getting ready to order the last parts (I hope...). Two questions though: Kevin quoted 16W dissipation for the 10m90s a few pages back, but is that per board or per device (i.e. 32W per board)? I'm planning to use a 450V PSU, probably a BH-PSU since I have a board left over and I'm not sure I can fit a Carbon PSU in the intended chassis anyway. Also, once the amp boards are done is there a way to verify that all voltages are OK before I plug in tubes? (or better still, before I even buy the tubes ) //UFN

Neat. And no volume control - I have been thinking about that as well //UFN

Not sure about the DCA75, but FWIW I have both the smaller DCA55 and the DY294. The DCA55 is brilliant but the DY294 has a couple of features that the DCA55 hasn't. First of all it has the HV breakdown test for (potentially) spotting fake HV-transistiors and secondly it can measure BJTs at different base currents. The DCA55 only tests BJTs at 2.5mA collector current which honestly isn't much if it's a driver- or powertransistor. So, my conclusion would be that I actually need both If I had to only get one it would probably be the DCA55 though, and the DCA75 might have even more features. //UFN

Excellent! Much appreciate your efforts on this //UFN

Go for it! Was actually interested in the CFA3 myself, but I have so many in-progress projects that I just will not do. On the list for 2017 though //UFN

Nice. Gotta get mine finished soon //UFN

They look a bit like these? //UFN

FWIW I'd vote for the black one as well //UFN

Was actually considering doing my own GRLV before, but I'm convinced now Looks nice IMHO. //UFN

That's probably from the first GB (check the beginning of the thread). It should be fine to build if you have the parts, but they are all obsolete now, so if you are missing something it might be hard to get hold of. IIRC the newer boards were mostly made because the old parts weren't available any more, not because the newer parts are better. //UFN EDIT: Hang on, you are writing "the board" as in one? - remember one board = one channel.

Says length quite clearly? //UFN

I remember walking around small electronics shops in Taipei and seeing these "Alpha" pots in quite a few places that definitely wouldn't buy 1k pcs at a time, so a local Taiwanese manufacturer makes a lot of sense to me //UFN

Would be interested in a pic of the SJ74s before I commit, but YGPM anyway //UFN

I believe Kevin's schematics normally assume 1.7V red LEDs, e.g. Mouser p/n 859-LTL-307ELC. //UFN

http://www.familygate.eu/alps/PDF/RK27114_10KDX4.pdf //UFN

+1. Interested in SJ74 and SK170. //UFN

The opamp is just a servo, so not much point in replacing the existing OP27s. As for headphones I believe this is intended for low-impedance phones so the 600ohm Beyers probably aren't the best choice. //UFN

Agree that not quoting a price up front can be problematic. However, not wanting payment until the customer as completely satisfied with the work done sounds like a commendable business practice (it's tends to be the other way around - pay up front and then pray that you'll be happy with the work afterwards ). //UFN

Paid the last "installment" and updated the sheet. //UFN

On the other hand, it might be the cheapest shaft extension we'll ever be offered so I'm at least very excited //UFN

I would suggest a) that the shaft length should be 25mm (above the threaded part) for both the CP601 and the CP2511 and b)) out of consideration for @MLAthat we limit the choice to two options (regular/long shaft) for each model @MLAHave added 2 pcs. CP2511 to the sheet. I'll pay the difference over my original payment tonight. //UFN