audio-talk

ed wrote: Tue Apr 22, 2025 11:17 am got another one...this time with nutella
the last one in post 16901 was peanut butter IIRC

Now what happens?

I have AC heaters in my line stage. Wouldn't even know if it's on. It is differential not SE. Don't know if that would make a difference.

Great progress Ray. Long may it continue.

She was a huge talent on many fronts.

Love the LP Dangerous Aquaintances as well as Broken English.

Afaik nobody is banging on about battery bias these days. Apart from anything else you forgot about the batteries and the world is probably littered with scratch build circuits built in those days no longer working and it was that long ago nobody can remember what the circuit was anyway. LOL. Keep ...

4 to 6 weeks dispatch. Only if the price is keen IMHO.

I was prescribed omeprazole for gastritus. Sent me into a spiral of depression and other side effects. Never felt so bad. Apparently one of the rare side effects. Changed diet for a long while to fix it. Glad it works for many others.

Best wishes Ray for a positive outcome.

On your previous MoFo, you had two inductors with their coil axes aligned - you won't want to do that on this one. Even better, make sure their coil axes don't point at anything sensitive.


When you say coil axes, what is the axis of the coil? Do you mean a line through the middle of the hole or ...

Some practical reference points.

I have test points on the driver. Without bothering too much, I have 0.6v offset at the anodes and the drivers are dc coupled so that's a cascaded offset. That equates to about a few mA of offset current and less on the input pair. There are no circuit adjustments ...

I don't know if you have already bought the LL1667s?
I just spotted that Don Audio allow you to specify the PP version (low current / high inductance version). In the past, the lowest I have seen offered is the 5mA version.
I used the 5mA version in PP mode in the past and the LF bandwidth was one ...

I don't understand that UP cap when the cathode bias resistor is bypassed. How can you inject anything into the cathode circuit when it has a low AC Z to ground where the PSU cap is which takes the AC loop back to the top of the UP cap. I thought the UP cap was there for an unbypassed cathode and so ...

Given the thing operates mostly in deep Class A push pull, I'm wondering if I even need to bother with boutique caps in the power supply - what exactly is the TC series going to bring to the table that a Wima won't. Plus a wider range of values and... better data!



I guess coz most of my ...

The reason I said put them in parallel (instead of using a single resistor), is it was said that 270R was easier to find that 135R, so just suggested making the 135R out of the two 270R is parallel.


Do folk get concerned if the resistor is 130R (easy to get) vs 135R? For this particular ...

Belt and braces tbh. Just use the two 270 and try connecting the cathodes and see if there is any difference.


My amp is a little different in this area and of course being direct coupled, the cathode resistors are large. Separating the resistors looks terrible in the sim. So a no go for the ...