jose

If you have not noticed, it's been better than I thought. OK, use a 500 Ohm trimpot on 250R place (Rail +) and maybe change 10K resistor on the OPA (- Output to Ground). However, Dr Gilmore is still working on a solution (Thanks Dr. Gilmore for you patience)

Not as elegant as a servo but works

Thanks Pars. I bought both.

Is the knob already assembled?

Could I use those regulators as dc-dc converters? Edit: I need a step down from 20 Vdc to 12Vdc

How do you put the led on the volume knob?

I'm waiting win the lotto

Ufffffff. Paragon is a beautiful speaker. I guess you know the work of "Kenrick Sound" restoring the Paragon ans other JBL models Sorry for offtopic

Yes, yes, I followed the recommendation of that post but now I have changed the volumen, putting it between the unbal/bal and buffers. It is also true that you use an attenuator (relay or digital I´m not sure) and I am using a volume pot.

Nop... Apparently the right place for the Unbal/bal is before the volume pot. I guess it worked better with a stable input voltage. Maybe Dr. Gilmore can explain it to us. Offset is a different problem. We are working on this. Apparently it is easy to solve without changing our pcb's. I just fixed one of mine, but surely there will be an improved PCB. Basically we already know how to fix it. Modifying the 250 Ohm resistors... at least in my case. I need to modify the rest of my buffers to compensate the offset. Let me experiment a little.

I´m working on my KG Preamp unbal/bal. I was setting up my preamp in the following way: Input- Volume-Unbal/Bal-Buffer-output. Dr Gilmore recommended me to change the order and put the volume between the Unbal / Bal and the Buffers, so now is: Input-Unbal/Bal-Volume-Unbal/Bal-output.

very nice!!!! I like leds around the volume. Edit: ... but I prefer K100RT café race too.

For your next project maybe?

Scott Hamilton... guys, is beautiful.

RIP Michael...

Beautiful... I can not stop looking at it

Change the THAT340 for 2SK170/2SJ74. Yes, it's expensive but it's worth it and this amplifier deserves it You have Linear on DIYAstore or you can search some member that have Toshibas. I think that 55º is right.

Paid. Thanks!!!!

Steve please remember that I only need two set of THAT adapters and add a new unbal/bal tube pcb (in total two sets) at my order. Thanks

I am very interested in this question. I was thinking about using the Salas Shunt on my Pearl II but I am very attracted to the idea of using the GRLV.

Thanks Dr. Gilmore. Silly question, what's the point of putting another buffer between unbal / bal boards and the CFA if it already has a buffer in its input? Just adapt the impedance? I am using the unbal / bal directly connected to the CFA and the result is great.

Steve, Do you received my PM? I'm waiting for the change to pay you

No, noooooooooo... I assure you that my hearing skills are quite common. My idea is to test if the improvement is real using Jfets instead of Fets. Measurable things like the ones I saw on the Dynalo/hi Susi using Jfet vs Fet (or rather the That340. How I hate that integrated shit ). Probably you are right it´s a better idea to experiment on the unbal/bal or buffers instead of the amplifier. That by the way, I have to say that the un / bal works great. I have been using balanced and SE and it sounds nice, very nice. I have also seen that the CFA works better with the unbal / bal with a 10k pot as preamp than with my Classé preamp. I´m not sure why *About the buffers, these continue to give me real headaches, I don´t get them to work.

Erik Söderlind

Thinking about this. Would it be possible to change in CFA Q9 and Q11 by Jfets as we did in the SuSis?