luvdunhill

There are a few ways to do it. If you attach the heatsink to the transistor case, you pay a pretty large thermal penalty. I think the best way is a large land with an attached heatsink.

Transistors. Check out the picture

Is there a good source of info on doing the multi region back on the 103 that still is compatible with the SACD ripping "feature"?

What do the Triplanar arms go for these days on the gently used market?

I have a 103 on the way agreed on all points.

Hm...

I had totally forgotten about krmathis!

The problem I have found in the past is the noise spectra (between units) differ when doing this with switching supplies, and they don't correlate in a way where the usual circuit topology will cancel such things out. It's clearly visible on a FFT. Granted my experience is at much higher currents than here, but I would look for this when doing the final measurement of the amp.

Kerry, are the switchers +/- in a single unit, dual-mono, or one switcher per polarity?

Ok, ok - let me back in. I take it all back!

I have done that one a few times myself - too easy.

So Al vouches for me and you still can't get over it. Ain't you a sweetheart. We aren't the hive over here - one can disagree with Al, ya know. Remember that time when Pete Millett impersonated DannyB? See?

Changing it up

For the two heatsinks that have faces that attach to the board, perhaps remove the solder resist on the top side?

I have the Cross-Spectrum microphone and was going to use the ULN-2 mic-pre. Do you know if SpectrumFoo can accept a mic calibration file?

anyone have experience measuring room response with SpectraFoo?

Still more expensive than ordering from Japan. I am glad to grab anything you are interested in!

So, this * 1000, thank you for the suggestion! I am doing a group buy at DIYAudio for high performance (Kerafol) custom die cut TO-3 insulators. If anyone is interested, please PM me!

Here is one more shot. I just sent off for the Teflon sleeving for the screws and pins. Also a little lab case with some low distortion oscillators, that is in progress. Needed a bit more voltage swing at times than the QA401 could provide.

I would try to make the Box Series 5 fit. More here: http://www.boxenclosures.com http://www.boxenclosures.com/category/product_details.html?product__id=241584 Trimmer depend on 13 or 25 turn, gull-wing or j-hook. Depends on hand soldering or not. Copal makes some nice small ones.

Your opinion would be great! It's 6mm bracket, 0.375" copper and then the heatsink back is 8.5mm. Here is a photo:

Here is my experimental approach to mounting TO-3 devices without the expense of machining angled brackets. Not the most efficient way to mount things, but maybe it will be good enough. Oh, and yes that's the Harris logo. As it turns out, the IRF240 devices feature larger diameter pins that wouldn't fit in my PCB sockets. The '244 features the same diameter as the IRF9240 as it has it (if you can find them). I would love some Harris 9240 if anyone has a source!

It would come down to a suitable app ecosystem, assuming streaming.

I can if you can provide some feedback on some changes send me your e-mail!

Agreed with everything here: