Author Topic: my harmonic overtones story unfolds.. (Read 5528 times)

_tom_ · « **on:** October 24, 2005, 08:30:34 PM »

I noticed today, whilst playing around with different volumes, that I dont get my harmonic overtones (which I posted about a while ago) when the volume is low (around 1 on the dial which is still pretty loud as its not an audio taper pot), but when the volume is med-high (around 3-4 on the dial) I do get them. Does this information help in solving my problem atall? Ie, I thought it could be a speaker problem.. I dont know alot about this kinda thing though :P

Cheers for any help

HJM · « **Reply #1 on:** October 24, 2005, 09:13:47 PM »

Overtones are all volume related, valves emphasis different ones at different levels of drive. Speakers sometimes add overtones, Vintage 30s can give a really nasty wolf tone with some amps for example!

_tom_ · « **Reply #2 on:** October 24, 2005, 09:15:32 PM »

Oh, so I am still back at square one really :lol: bugger, thought I was onto something then!

Bainzy · « **Reply #3 on:** October 24, 2005, 09:22:34 PM »

i love harmonic overtones, if you want more, try replacing carbon film resistors in your amp with carbon comp ones (in the preamp signal path is probably best), and use ceramic disc caps instead of silver mica ones

steve · « **Reply #4 on:** October 24, 2005, 09:42:42 PM »

Quote from: HJM

Overtones are all volume related, valves emphasis different ones at different levels of drive. Speakers sometimes add overtones, Vintage 30s can give a really nasty wolf tone with some amps for example!

Your not joking about the Vintage 30's,it can get quite unmusical!

_tom_ · « **Reply #5 on:** October 24, 2005, 09:42:57 PM »

no, they arent good harmonic overtones! They are the horrible ones which sound like lower, much quieter than the note your playing, you can really hear them in bends!

HTH AMPS · « **Reply #6 on:** October 26, 2005, 08:17:43 PM »

that description sounds like ghost noting from the amp, the most common cause of this is conservatively filtered vintage-style amps. Some speakers ghost note too.

:twisted:

HJM · « **Reply #7 on:** October 26, 2005, 08:22:48 PM »

And check your bias too!

_tom_ · « **Reply #8 on:** October 26, 2005, 08:34:24 PM »

Hmm ok I dont have a multimeter to hand though! I'll see if my guitar teacher has one next time I go in, I dont really wanna buy one.. though it might be useful?

HJM · « **Reply #9 on:** October 26, 2005, 08:57:07 PM »

Don,t go poking a meter around if you're not sure...you'll need some way of measuring the cathode current to set bias, like the Bias Probe tool, or the on Weber sell!