G600

As I don't have any running project, It is a 2$ basket with 25$ for fedex, that's why I ask here in the first place.

Gentlemen, Is there anybody here with some Xicon surplus? I'm finally having my batteries reworked, and I'd like 24*820k + 8*390k + 4*62k. Thanks

Quite little for my taste... Did you use a magnifying glass? Glad it went alright.

Do you have a timer setup for that chair-heating "device"? ?

I think that correct interpretation of measurements requires a huge lot of knowledge and experience. Read Nelson Pass description of curves for example... The easy way is probably to over-interprete things.

Don't get fooled by the latest fashion. Buy one, enjoy it, and if it's not enough you can change afterwards. I bet it'll be keeping some money value in the future.

Why don't you get in touch with Birgir? Mjolnir Audio. Not cheap but built for a lifetime, not mentioning the small footprints he delivers...

Proper funding is mandatory for those DIY projects. Not mentioning killing yourselves with fake sand, along with troubleshooting made impossible not knowing who's who. Saving a few ten or hundred bucks is bullsh*t, common, you are going to play those with top dollar headphones, and they are designed to last decades. Quality remains, prices forgets. And some savings are costly.

Soldering in music... sounds like Head-Case panache!

Any update on this GB ?

Incredible ! Everything look easy in your kitchen...

Another route would be to identify the critical resistor, and if they are few enough, buy texas components metal foil tailored to your value and tolerance ? May be a plus soundwise too...

At least one full set for me, and depending on cost some more.

We definitely need a group buy for those PS. All-in-one PSU for the miniT2 kept mini (apart from the transformers, but that's another story).

Have you tried it with FETs instead of THAT340 ?

Do you see critical resistor, some that will benefit from lower ppm or tolerance ?

Excellent work as usual, JoaMat. Please let us know if you test those values in your working unit ! I'm thinking of populating the SMD resistor with the fine Susumu RG (thin film). Used them in the QRV-08 (Sjostrom). 1206 are 200 V rated and 805 150V, should be plenty.

Kerry's mini PSU are so interesting for such a tiny amp !

Why don't you just buy the thick ceramic pad and a PEEK screw ? No insulation tester, no fried sand and no risk of being transformed in charcoal.

You could extend soldering pleasure by making your own volume control instead of RK50. For example a Seiden 32025 with the matching set of resistor for 10K http://www.goldpt.com/r_series.html You could make 3 for the K50's price.

A lot of fun indeed. Just go slow and double check everything.

+1

Yours is safe. But just take a careful look before starting populating the Beast.

Scary indeed !

Sometimes I hear some random cracks. They come and go, and at some point the channel goes south. Voltages are off, with something like 40 V between the two right batteries, and a very large offset at ouput. It could be cured instantaneously by putting a Voltmeter between battery testpoint and +500V supply entry. Tried to adjust the batteries in many ways, but it comes back anyway. I have also uprated the compensation cap to 15 pF. The amp runs cooler afterwards, but the problems is still happening.