Search found 11794 matches

by Nick
Mon Aug 19, 2019 9:53 pm
Forum: Beginners
Topic: Help interpreting 2nd/3rd Harmonic values on WE datasheet
Replies: 1
Views: 15

Re: Help interpreting 2nd/3rd Harmonic values on WE datasheet

Yes, so for example 40dB is 1%, 20dB is 10%
by Nick
Sat Aug 17, 2019 10:27 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 93
Views: 4341

Re: Inverted OTL with 6SN7/6AS7

Yep.
by Nick
Fri Aug 16, 2019 10:45 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 93
Views: 4341

Re: Inverted OTL with 6SN7/6AS7

Mike did something similar (Without rectifier) some years ago.
by Nick
Fri Aug 16, 2019 9:56 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 93
Views: 4341

Re: Inverted OTL with 6SN7/6AS7

Don't think so, I was referring to the
but there is someone working on an HV version (I think around 450V).
As not covering the voltage range (for example) I may use.
by Nick
Fri Aug 16, 2019 8:03 pm
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 93
Views: 4341

Re: Inverted OTL with 6SN7/6AS7

They should be fine with any current requirement we're likely to ask of them for audio projects.
But not voltage.
by Nick
Mon Aug 12, 2019 8:47 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 93
Views: 4341

Re: Inverted OTL with 6SN7/6AS7

I won't use the TVS diodes because they change the sound
I have tried and failed to use TVS diodes in the signal path for overload limiting. Never works, I assume there are some capacitance (and probably non linear) in there.
by Nick
Sun Aug 11, 2019 8:27 pm
Forum: Assorted Stuff
Topic: The Audio-Talk Motorcycling thread.
Replies: 479
Views: 42720

Re: The Audio-Talk Motorcycling thread.

I just was happy having an excuse to post a bonzo link.
by Nick
Sun Aug 11, 2019 7:07 pm
Forum: Assorted Stuff
Topic: The Audio-Talk Motorcycling thread.
Replies: 479
Views: 42720

Re: The Audio-Talk Motorcycling thread.

Closest I can get

by Nick
Sat Aug 10, 2019 7:33 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 2219

Re: GM70 PP

IslandPink wrote:
Sat Aug 10, 2019 6:44 pm
Nick wrote:
Sat Aug 10, 2019 6:11 pm
.... If it doesn't agree with experiment, it's wrong. Richard P. Feynman"
Now then Nick - remember what we said over email, about citing Richard Feynman against people in an argument ?
Not sure I was citing it "against" anyone (other than myself), and I am not sure I was even arguing :-).
by Nick
Sat Aug 10, 2019 6:11 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 2219

Re: GM70 PP

Sometimes a little more complexity allows for simpler and therefore better operation. Or, sometimes more complex is better full stop. Without needing the mental gymnastics making black into while so it fits in with a dogmatic position. "It doesn't matter how beautiful your theory is, it doesn't mat...
by Nick
Fri Aug 09, 2019 10:48 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 2219

Re: GM70 PP

But I also read the grid acts like a diode under these conditions and so I can see the AC might be only in one direction and so as you say, it charges up.
Once the grid goes positive, it becomes an anode.
by Nick
Thu Aug 08, 2019 10:00 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 10620
Views: 718450

Re: Nothing In Particular

JohnG wrote:
Thu Aug 08, 2019 8:24 pm
Ahh ! It looks like I have accidentally give D' the B' a Mis-fueling .

I like to think of myself as a type of Vegetarian, as everything I like to eat, used to be a Vegetarian when it was alive.
You don't eat Chicken or Pork?
by Nick
Thu Aug 08, 2019 9:57 pm
Forum: Assorted Stuff
Topic: The Audio-Talk Motorcycling thread.
Replies: 479
Views: 42720

Re: The Audio-Talk Motorcycling thread.

Well if its a twin, so I assume one bang per revolution, so thats 4000/60 or 65Hz, wavelength of 65Hz is 5m, so quarter wavelength 1.5m. Maybe.
by Nick
Thu Aug 08, 2019 12:42 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 2219

Re: GM70 PP

Well, you raised a question about a problem. I suggested a solution, if its not a problem you need to solve, then you don't need a solution :-). I can't see how a cap would help, it would just get charged up by the grid current. You just need a supply that can sink as well as source current, and tha...
by Nick
Thu Aug 08, 2019 10:21 am
Forum: Everyones Projects
Topic: GM70 PP
Replies: 67
Views: 2219

Re: GM70 PP

The bias supply has to deal with this grid current situation and there seem to be a number of solutions.
A shunt regulator seems to be the simplest IMHO. Couple of VR tubes at its simplest, active shunt to get more complex.