Kerry

They’re designed to sit flat on 75mm or taller heat sinks, so 2U will work just fine.

Work in progress... I should be able to test soon 🤞

I hope you enjoyed your birthday Al Happy Birthday!

I'm sure the A version of the BC556 should do just fine. Just a note on the thermal grease. I've had issues with some types being conductive at 500+ volts - it's been years so I don't remember what I used. Make sure it doesn't get between the Aavid washer and the screw / ceramic insulator. Looking good so far

Thanks Alan. I'll give that a read. Interesting that it's from back in the day Here's a rendering of what the amp will look like. It will be about 70 x 150 x 24 mm. We're looking at using USB-C PD so we'll be able to run off of most chargers (at least 20W). Power input will have a boost/buck converter so it could run off of 5/9/15/20V chargers. Still some work ahead, but we think we'll be able to fit a DAC in as well.

Happy Birthday!

Happy Birthday!

To Nate’s comment... Wow, I’m now thinking of a smaller version I could inflate to do smaller jobs. I’ve seen the popup ones they use for spray tanning, but there a bit too small.

Happy belated Birthday Craig!

Happy Birthday Nate! Glad you enjoyed the day

A little bit of playing with some options/config on the bias supply and we got it down to 40mA draw on the batteries Might be able to do a bit better still. All in draw now is 260mA. We have some ideas on how to maybe bring this down a bit more.

Most of that is going to the supplies. The amp idles at almost nothing.

I couldn't stop listening to this yesterday I was using my SR-007's. It drives them very nicely. Very rich deep bass and good imaging / sound stage, which is usually where the 007's suffer without the proper amp. This was running this off of a bench supply at 11.1V and it was drawing .4A very consistently. The top board is the +/-300V supplies (with input EMI filtering) and the one below that is the bias supply set to 580V. Each amp section is 1" x 2" and each of the +/- PS sections are 1" x 1". Bias is a little wider.

Happy Birthday Naaman!

Thanks 👍

I'm looking for an HE90 jack. PM me if you have one to spare or know where I can order relatively quickly. I've been in touch with the manufacture, but it's going a bit slowly. Thanks

Happy Birthday Dan!

I’ve been using fqpf8n80c with my miniature miniaturized (smaller than the group buy version) Golden reference supplies. I also have the negative supply GRHV79 working in there too. I always use the external current regulators now since they are much faster and actually protect the supply. Works great. I’ve got a lot of hours on these.

Happy Birthday Al!

Happy belated Birthday Colin! Hope you enjoyed the day

Happy Birthday Steve! Hope you’re feeling a little better. Best wishes.

Happy Birthday!

I use HDPE for that stuff. I’ve always had problems working with delrin. It melts as you cut it.

Happy Birthday Jeff!

Just chillin' to this...