johnwmclean

“Normal” behaviour from my experience at a cold start offset is around 10 - 20 VDC and drifts down to under a 1VDC after 20 - 40 minutes. So yeah I thought it’s abnormal.

Great reporting Simmconn, I’ll be very interested in a follow up of where you end up after dialing back. One channel of my latest build has little to no drift at all (no servos installed), which is odd behaviour from my experience. After 45 minutes warmup offset and balance can be trimmed to under 1VDC. From a cold start everything is now under 1 volt and stays that way. I’m curious as to the reason, do I need fix or leave as is?

As long as voltage is good you probably don’t need a load.

Very sad news so sorry for your loss Steve.

Happy Birthday!

happy birthday dusty!!!

I used the C3M0350120D in both the Carbon and GRHV. On the bench I tested the amp boards separately and they worked fine along with the GRHV. In the final build with 2 amp boards connected there was oscillation which caused all sorts of odd voltages, namely 400V over the outputs and a GRHV + rail that read 8V. Funnily enough I could get the amp working with the capacitive load of a dvm killing the oscillation when probing over the GRHV outputs and I had music. I replaced everything back to C2M1000170D and all was stable. To be honest I haven’t done enough testing to know whether the GRHV with the C3M0350120D would be ok in the field or not. But hopefully you can gain some insight from my experience with it.

FWIW the C3M0350120D did not work out in a recent GRHV/Carbon I had all sorts of funky behaviour.

yeah... that part is rated 72 amps and $83.85 a piece.

High Tension An Australian band, at least some of our music is still cool even if our French relations are shit.

mmm... I’m pretty sure that is the same old generation.

💦

Looks like a Chinese company that’s pricing using AUD. I have wondered how they made their amps so cheap. What a steaming pile of crap.

Done, good luck Nate!

It really isn’t patch on Kerrys magnificent builds, he’s on a whole other level.

Finally done! I regrettably sold my previous KGSSHV Carbon a while ago, this one’s not going anywhere soon. This is a 400V, 19mA version, using the ground plane amp board, Sumr transformer and Goldpoint V47 attenuator. I bought the heatsinks from China and had all the drilling and panels done at Front Panel Express. I pulled out the Canon 5D from the cupboard for some tasty shots.

More progress, it’s been a while since I tested one of these, I used Soren’s adjustment method for the CCS which worked well, dialled in for 19mA

Another Carbon in the works, I received my panels and drilled heatsinks back today. I haven’t put it together yet... I sure hope everything fits. Adobe Illustrator preliminary file:

Ledisi - Sings Nina

Or you could use Molex Spox connectors instead of terminal blocks in those LV positions.

I like it a lot!

Wow!

It’s a wee little beasty. Very slick, but how much current are your pushing with those sinks?

Here’s a place to start: