Opamp fx loop white noise

[Traynor]

On a different note. What's going on with the two 100uf filter caps. How did you wire them up seems off to me.

[pdf64]

Zoom in and a black wire can be seen that puts the caps in series.

I think the plan is good, and I can spot an error on that schematic anyway, so I suggest to keep to the plan.
But the c3 -r9 node short to Vref test should be quick to do and may be useful.

[psychepool]

I heard from my acquaintance that the cause of the hiss is likely to be a lack of current. It is a high-voltage low current because the B+ tab of the PowerTrans is used for vacuum tube plates, but opamp is said to need more current than expected.
The disappearance of the hiss at +4 dB and the generation of the hiss at -10 dB are also attributed to the higher gain rate, which results in more current drain.
To prove this, I lowered the bias trimmer and put in 6v6 pairs. Hiss has almost disappeared in -10 dB mode!

Is it okay to say that there is not enough current? I'm curious about your thoughts.

I couldn't remember the amount of current I used, so I called the place I ordered again. They said 325-0-325V 300 mA. They are also not sure because the order is several months old.

However, it is 4 x 12ax7, 2 x 6L6gc, and dual opamp that drives this line.
If the spec of this PT is 300 mA, isn't it enough to operate them?

The same loop circuit was operated very well in the previous made amplifier.
The difference from the previous made amplifier is that it used TAD 6L6gc pair for power tubes.(previous made amp used Tung-sol 5881)
I don't think there's any special specs difference between these two vacuum tubes. How do you think about it?

[pdf64]

I heard from my acquaintance that the cause of the hiss is likely to be a lack of current. It is a high-voltage low current because the B+ tab of the PowerTrans is used for vacuum tube plates, but opamp is said to need more current than expected....If the spec of this PT is 300 mA, isn't it enough to operate them?...

What is the circuit's supply voltage, ie the nominal 30V across the series pair of 15V zeners?

See http://www.ti.com/lit/ds/symlink/tl074.pdf
p13 specifies that at =/-15V supplies each amp will typically draw 1.4mA, the max being 2.5mA.
Hence I really can't think that your PT is being unduly loaded by the addition of the circuit, as it almost certainly won't draw more than 5mA.

... The disappearance of the hiss at +4 dB and the generation of the hiss at -10 dB are also attributed to the higher gain rate, which results in more current drain.
To prove this, I lowered the bias trimmer and put in 6v6 pairs. Hiss has almost disappeared in -10 dB mode!...

What idle plate / cathode current were the 6V6 drawing at the bias setting used?

[psychepool]

I was so busy that I got to work on it after a long time.
As you said, I changed 470R of IC1B Input to 470K.
There was no difference.

Maybe a little less, but it's a meaningless difference anyway.

It does not seem to be a good approach to infer that the cause of noise is a lack of current through the disappearance of noise after replacing it with 6V6.
I think the output is just getting smaller and the noise sounds that small.
No matter how much I think about it, I think 300 mA has enough current to run my amplifier.

I think I've tried everything I can with this circuit.
So I'm going to try the ceriatone Klein-ulator.
Potentiometers will be replaced by trimpots.
I'm a little worried because I've heard that the circuit is not a circuit where transparency is an advantage.
Still, if there is no noise, even with a proper level of transparency, it will manage to use it with satisfaction.

But still, let me know if there are any more things to try at the Opamp Loop.
Because this circuit was used very satisfactorily in the amplifier that was last applied.