Leaderboard

Have we had this before? Must have.

Pig

I agree that the servo on the BH is probably not necessary. It is fine after about 10-15 minutes warm up. But I love a challenge, and getting a servo installed on my BH sounds like as good a challenge as any. JoaMat is kindly giving me some advice and direction, and I will report back when I have a pair of servo daughter boards created and working for the BH (fingers crossed). Back on the topic of the BH BJT itself, it really is an amazingly pleasant amplifier. Yet I can't say what it is about the amp that is so good. A/B testing with my Carbon and SRX don't really tell me anything. I honestly cannot tell a big difference. Yet listening to the BH for an hour or two leaves me feeling so good, whereas the Carbon is a bit more fatiguing. Not saying the Carbon is not great, I just find it less suitable for listening to for a couple hours while doing other work. I find I am using the BH for my 'ambient' amp, where I want to listen to music for hours at a time while doing other tasks. I tend to use the Carbon for my 'critical listening' amp where I want to really focus on the music without other distractions, at perhaps a bit higher volume level. My SRX is a great amp for both use cases.

Stax mafia boards linked to in the stax mafia boards thread i highly recommend you doing a diy-t2 as your first amplifier. More than one person has done this. If you survive you will learn a lot less dangerous is the supersymmetry dynalo with the golden reference power supply then the current feedback amp balanced or single ended with the golden reference power supply more challenging is the uber2 amp

Depends on what its function is. As Kevin Gilmore points out, for a servo, an op amp with virtually no offset current (JFET rather than bipolar) and low temperature drift, that is slow (since the servo is monitoring for DC offset and is deliberately slowed down anyway), is good. OTOH may sound like crap as an amplifier, where the requirements for "good" are significantly different.

He's SF, they eat snakes.

Let's not dwell on the specifics of how something actually works.

ooph good...

Cryo’ing should slow it down a bit.

Popped up on shuffle tonight. YouTube has the old video I remember. #Blessed

1st pic is best kind of Pasta!

Pasta

Got the filaments down to exactly 6.0VAC using 0.3R 5W resistors. B+ and B- are both solid now as well. +375V and -378V. About 0.2 drift over 30 minutes of warm up then stays fixed after that. Still comparing to my SRX and Carbon, but the sound is certainly glorious! I know, pics or it didn't happen. So.... Above, you can see that in order to make this fit in a 300mm deep case, I had to create 2 layers of boards. PSUs on bottom, Amps on top, with about 30-40mm of overlap. There was actually plenty of clearance and I could have moved them to overlap even more if needed. I was able to leave enough room in front for the power switch and future quad pot when it arrives. Please don't give me too much crap for the messy wiring. I plan to take it apart next week to add the quad pot and clean up the internal build a bit. I just wanted to prove to myself that it would fit! Also, notice that I am using the 755-SCT2H12NZGC11 as a replacement for the C2M1000170D for the PSUs. It appears to work just fine and runs cool. So we do appear to have a backup device for when the C2M1000170D SiC is out of stock. Also, in the front middle (under the mess of wires) is a timer delay for the CPC1117 HV delay turn on, as referenced earlier in this thread. I have it set for 60 seconds. Above with the tube cages. I have not install yet, but just wanted to see how they will look. That will be next week... And finally, sharing some room with my Carbon. Not pictured are my SRX builds (one mine, one my son's). BTW, so far, the BH runs cooler (both case temp and silicon temps) than my Carbon. Both running at 20ma.

have a couple of prime ny strips in the sous vide for tonight's dinner.

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