audio-talk

OK, Suggestions have been taken on board re separating the two functions. The two-box, separate power supply option will be used. So....here's the line stage: UGBuffer.jpg Designed by Max Robinson of the Angefire website: http://www.angelfire.com/electronic/funwithtubes/Amp-Tone-A.html (fig 6.1.) It...

I would concur with our Ant. My 12in versions have also taken 2 years to break in. They’re also in big boxes. The first time I had them at Steve’s, when they were relatively new, they were ear bleeding on some records. I took them to Owston, they were slightly less ear bleeding. The following Owston...

Might be the best plan as you both say to build the line stage and forget the phono for now. It’s just going to get silly otherwise.

I have a prejudice that phono stages should have a high gain first stage. And with this, a two stage design is enough. There are a number of ways to do that. I don't know for sure, but I would imagine a number of cascaded low gain stages will result in quite high noise. A high gain first stage coul...

Rather than do the cathode follower, I’ll probably go 1uF cap, 10K feedback resistor, 0.22uF cap, 1 Meg resistor, then output terminal. otherwise it’ll be a delicate balancing act to elevate the heaters to the right level. With just a couple of followers 100V above the heaters, it’ll be easier all r...

izzy wizzy wrote: ↑

Sat Sep 19, 2020 5:17 pm

You're using a phono at the moment. What is it and do you know the gain? If it is in the right area, this is the gain you should be aiming for with this design.

Pro-ject 40dB. No hum and no RF pickup.

Oh poo! I see what I did wrong. The CF is needed to keep DC off the linestage input pot! Broskie even says that in his write-up..which of course I didn’t bother to read properly..Stupid boy! :oops: Told you I was a bit thick about these things. No problem to put the CF back. Seven valves then. Using...

Nick wrote: ↑

Sat Sep 19, 2020 3:27 pm

You will have 3.6v on the output of that phono stage without the cathode follower.

Cheers Nick, I’ll put it back on.

Extremely shoddy!

Here's another set of schematics. You'll have to excuse my naivety, but I'm new to preamps, I'm trying really hard and these diagrams take an age to draw. I need telling about any howlers. The setup below is put together from a Broskie phono stage design, but with the cathode follower removed from t...

...The cornerstones have remained, the big 15" fane sealed box speakers with their underappreciated drivers, Glad someone else appreciates, how under appreciated the Fane 12 and 15in tri-cone drivers really are. Now mine are fully run in, after nearly two years, I wouldn’t use anything else...they ...

Thanks chaps. Now that the verdict is in on my proposals :) it looks like I need to complicate the phono section and simplify the line stage section. To that end, I’ll just use a tilt control in the tone stack. TBH, I think that using tilt, will be a perfectly adequate method of making fine adjustme...

Here's the setup: Circuits, courtesy of Max Robinson's Angelfire (Fun With Tubes) website.
Finally got round to updating my LibreOffice package to work with MacOs Catalina.

Paul Barker wrote: ↑

Thu Sep 17, 2020 7:17 am

My work van with a crap audio that the young lads love gets treble turned down and bass up so I can tolerate the awful quality of the radio and the reproduction. But peace and quiet sounds better.

I like peace and quiet in the car and rarely use the radio these days.

I believe the circuits I’m drawing up at the moment, break international audiophile law in a very specific and limited way, and are merely insurance policy against a possible no deal screech fest caused by a 60s recording mixed for a console unit. I don’t necessarily like to have to propose these co...