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1. ## Thread: Corner Frequency Shortcut Calculation

by eschertron
Replies
8
Views
144

### Absolutely true. And in our case here, since the...

Absolutely true. And in our case here, since the physical components come with an 'acceptable error range', then the answer to the problem above becomes:
1/(2PiRC) =...
2. ## Thread: Corner Frequency Shortcut Calculation

by eschertron
Replies
8
Views
144

### If you haven't already, I think you'd like...

If you haven't already, I think you'd like reading Goedel, Escher, Bach It combines music, math, and fascination in deep and entertaining ways.
3. ## Thread: Corner Frequency Shortcut Calculation

by eschertron
Replies
8
Views
144

### To 7 digits, 1 million divided by ( 2 Pi ) is...

To 7 digits, 1 million divided by ( 2 Pi ) is equal to 159155, so there's nothing wrong with your shortcut at all.

I have to ask, though, are you often caught doing this math on paper? I'm never...
4. ## Thread: Magnet type vs sound

by eschertron
Replies
16
Views
401

### This was done with unmagnetized pole pieces,...

This was done with unmagnetized pole pieces, demonstrating how the AlNiCo interacts with a field produced by the coil? I can see that A5 is different than the others, but I'm not certain that if I...
5. ## Thread: Magnet type vs sound

by eschertron
Replies
16
Views
401

### So for an experiment with two Fender-type coils,...

So for an experiment with two Fender-type coils, one with A2 and one with A5: If we are given that the pole pieces are the same size, have uniform construction, are positioned in the coils the same...
6. ## Thread: Magnet type vs sound

by eschertron
Replies
16
Views
401

### I think the OP's question is hypothetical? But...

I think the OP's question is hypothetical?

But yours is a fair question. I know nothing about magnets, but for settling hypothetical versus realistic can we say:
1. Is it possible/likely to find...
7. ## Thread: these black dots on magnets annoy my mind

by eschertron
Replies
14
Views
440

### It's the nature of mind to find patterns - often...

It's the nature of mind to find patterns - often seeing them where there is none. I might see unicorns or spaceships when I look at the clouds. Are they there by design? I can't deny that I see them.
8. ## Thread: Traynor YBA-2 (EL84 Version) bad sounding asymmetric distortion... what's up?

by eschertron
Replies
29
Views
519

### Didn't the AC15 originally have a very high-gain...

Didn't the AC15 originally have a very high-gain input stage with an EF86? How close to a very British AC15 could this thing be nudged?

off topic: I purchased Hammond's replacement OT (10k...
9. ## Thread: Traynor YBA-2 (EL84 Version) bad sounding asymmetric distortion... what's up?

by eschertron
Replies
29
Views
519

### OK. So i took a brief look at the scope traces....

OK. So i took a brief look at the scope traces. Which of those traces look most like what you see at the speaker? What's the earliest trace that look most like what you see at the speaker? Whatever...
10. ## Thread: Traynor YBA-2 (EL84 Version) bad sounding asymmetric distortion... what's up?

by eschertron
Replies
29
Views
519

### So what happens to the bias on the second stage...

So what happens to the bias on the second stage when being driven by that high signal? I haven't looked at the schematic, just thinking blocking distortion from your description of the sound.
11. ## Thread: wooden chopstick vs plastic pencil

by eschertron
Replies
43
Views
698

### Oh, You're really missing out! EVERYBODY in the...

Oh, You're really missing out! EVERYBODY in the U.S. drinks it, every day! ;)
12. ## Thread: Who Screws the Screws?

by eschertron
Replies
39
Views
688

### Someone once regaled me with the story on...

Someone once regaled me with the story on posidriv screws, something about manufacturers and suppliers angling for exclusivity with the automakers, I think. That's why there are so many types of...
13. ## Thread: Who Screws the Screws?

by eschertron
Replies
39
Views
688

### I have a few phillips-head drivers that I ground...

I have a few phillips-head drivers that I ground the tip off of so that they would fit 'better' in a Reed-Prince screw. Saved my butt many times.

I have a hunch that many of the screws in the...
14. ## Thread: Who Screws the Screws?

by eschertron
Replies
39
Views
688

### Chuck beat me to the 'size matters' point, but it...

Chuck beat me to the 'size matters' point, but it bears repeating. It only took me 30 years to realize that a properly-sized screwdriver in a well-made (not junk) screw will fit with absolutely no...
15. ## Thread: wooden chopstick vs plastic pencil

by eschertron
Replies
43
Views
698

### Insert "ionized-hair smiley thing" here

Insert "ionized-hair smiley thing" here
16. ## Thread: Runaway current draw from single 6L6 tube

by eschertron
Replies
22
Views
464

### Drawing and posting at least the section of the...

Drawing and posting at least the section of the circuit where these devices were, showing them in circuit (identified with a question mark?) will help us answer those questions. Really, take a...
17. ## Thread: Runaway current draw from single 6L6 tube

by eschertron
Replies
22
Views
464

### What was the other tube's calculated dissipation?...

What was the other tube's calculated dissipation? Also, posting the voltage across your 230R cathode resistor will help me get a better idea of what you're facing. And I'm assuming the plate voltages...
18. ## Thread: Runaway current draw from single 6L6 tube

by eschertron
Replies
22
Views
464

### If you have questions about the amp, even - or...

If you have questions about the amp, even - or especially - with questions about the component function, start drawing out a schem for us and yourself. Input circuitry, power supply, output section,...
19. ## Thread: cheap kit Audio amp question

by eschertron
Replies
22
Views
839

### I can pull dead computer power supplies out of...

I can pull dead computer power supplies out of the recycling bin at work pretty much any week of the year. I've got a small pile of heat sinks from those stockpiled.

Also a nice chrome-plated PSU...

by eschertron
Replies
18
Views
789

### I occasionally put up a snap from the backyard,...

I occasionally put up a snap from the backyard, or some other nature scene. But my primary requirement is to keep my desktop icons visible amid the clutter. So mostly simple or no pictures for me.
21. ## Thread: Newb needs help with tubes.

by eschertron
Replies
27
Views
652

### All good questions, and welcome to the forum!...

All good questions, and welcome to the forum!
Preamp tubes generally are used in a circuit that makes them self-biasing, so that they do not need to be biased by the user.

edit: I see other, more...
22. ## Thread: Sweaty strings & fingers?

by eschertron
Replies
12
Views
522

### OK, amend that to read "after every time they...

OK, amend that to read "after every time they touch the strings". The point being: some people are so toxic the strings don't last a day. Understand that the chemical reaction between strings and...
23. ## Thread: Sweaty strings & fingers?

by eschertron
Replies
12
Views
522

### Some players changes their strings after every...

Some players changes their strings after every show, maybe every day. Sweat and whatever else - coffee, beer, tobacco - will kill the 'zing' and 'ring'.

You know they say "tone is in your...
24. ## Thread: Output transformer Harmonics Cancellation ?

by eschertron
Replies
22
Views
720

### I'd hear piano tuners complain about how the...

I'd hear piano tuners complain about how the harmonics were 'sharp', but I'd always attributed it to the way tuning by perfect 5ths results in a wolf tone (aka wolf interval), about 1/4 step sharp...
25. ## Thread: Output transformer Harmonics Cancellation ?

by eschertron
Replies
22
Views
720

### Right. Any whole number that can be factored by 2...

Right. Any whole number that can be factored by 2 until the factoring is no longer possible reveals the lowest harmonic that that number (harmonic) is an octave of.
26. ## Thread: Output transformer Harmonics Cancellation ?

by eschertron
Replies
22
Views
720

### I agree with that as written. In fact, I'd love...

I agree with that as written. In fact, I'd love to discuss the relative merits of equal temperament vs. the temperaments that Bach, et. al., favored; alas that ship sailed over 250 years ago. My...
27. ## Thread: Output transformer Harmonics Cancellation ?

by eschertron
Replies
22
Views
720

### Yes. Harmonics are whole number multiples of the...

Yes. Harmonics are whole number multiples of the fundamental frequency, so if the fundamental freq is defined as 1 cycle per (pick your units), then the harmonics are 2, 3, 4, etc. Ratios of small...
28. ## Thread: Output transformer Harmonics Cancellation ?

by eschertron
Replies
22
Views
720

### well, internet lore suggests that a signal...

well, internet lore suggests that a signal through a single preamp tube distorts in a way that adds 2nd harmonics. The mechanism is that one half of the waveform is distorted differently than the...
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