spritzer

What value did you end up with?

Just leave out the last stage. The CCS is changed to a 10M90 (same pinout as the other IXYS part) and use 300 and 1K resistors. The 2SC4686A is changed to the SiC FET

I blame my dad for this madness. He taught me how to solder early on and I had built my first amp at six. It was some battery powered opamp kit but it worked. I then moved to computers but instead of using them for something sensible I ripped them apart and put them together again numerous times. Things went quickly downhill from then on...

His version is the same as mine, I just did the same thing on the PCB level. You know me, I like to tempt fate...

The ESP950 is easy to open, just pull off the pads and remove the 4 screws underneath. Each earpiece simply unplugs from the headband making it even easier.

No good way to do that with our boards. Going this way and using KSA1156 for the front end CCS means only the fets are non isolated. That plus the new batteries will make the amp far easier to deal with.

Some layout changes and the small transistors have been changed to what should be available for the foreseeable future.

They are there to protect the transformers from overload situations so they can be removed. Just don't do anything stupid with the volume...

Not really, I simply haven't run out of the prototype boards yet. It is also far more limited and intended to be run at just +/-400V. Only IXYS CCS and only matched K170 input fets too. There is also the issue of close proximity of the traces so careful soldering is a must have with those boards.

I have to order some more parts in before I can finish this but I have the chassis ready. In other news, new KGSSHV boards showed up today. They've been listed on my website if anybody needs a set.

The one on the left is real but the one on the right... yeah... Even though I have more than 1000 2SC3675's in stock I don't think there is any sense to use them with the 2SC4686A available. Having the main CCS short to the chassis isn't fun...

With the ECR-400 I'd just wire the transformers directly to the input and see what happens. Thermistors don't last for long , let alone 40 years. No transformer I can think of fits the SRA-3S but most of the stock units can be rewired to at least 117V. Some even for 230V...

My offer timed out so it wasn't me. They also just had the one listed and not multiple units under the same listing... I did just buy a yet another SR-Omega so I can't complain...

I'll start at 400V and work from there.

We might run it at 20mA or even higher. Plenty of heatsinking needed....

Only up to 600V though. Don't try them in the BH...

Well we've been using them in the KGSSHV for a few years now and the 2SA1486 would always work as a replacement too.

The gain on the KGST is the same as on all the other 'stat amps we've done. Volume pot impedance doesn't matter so how much voltage are you feeding it?

That's pretty much what it is. A KGSSHV with the last stage removed and the gain stage beefed up.

This stuff belongs on HF. Now for something that belongs here... something new... The ever so elusive Carbon...

It's actually Rauðafellsgjá but I guess that's about as much gobbeldy gook... It's funny how related English and Icelandic are but the pronunciation is so different.

I could throw in a loaf of sourdough...

Use Vishay's and lift them off the board which does the same thing.

I've pretty much cleared out all the Japanese sellers at this point but you don't need that many. Use KSA1156's in the front end so you just need a handful per amp.

No capacitors or resistor issues that I'm aware of. These are generic parts so there are always subs.