Fizzyness

Sander
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Re: Fizzyness

« Reply #15 on: April 18, 2010, 09:07:01 AM »

Quote from: bluesfendermanblues on April 05, 2010, 04:56:22 PM

I use a 1n capacitor in series with a 150k resistor soldered to OD master pot in and ground. This trims off the fizzy highs in my HRM amp.

This really seems like a nice mod that might work for me..

I noticed there is more fizz when I plug my les paul into the 'high' input. When I plug into the 'low' input there's still a fizzy high end, but not as much as before. So what does this tell us?

I also noticed that the high end is pretty much controlled by the presence knob. When I turn it to 0 most of the fizz is gone. But than the overall tone of the amp is of course a bit "dull' or 'in a box". Can't it be that I just don't like "presence"? My previous amp didn't even had a presence control and maybe that's why i dídn't experienced fizzynes.... Huh?

?

Maybe it all sounds a bit weird, but these thoughts are just in my head;)


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bluesfendermanblues
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Re: Fizzyness

« Reply #16 on: April 18, 2010, 09:09:50 AM »

Quote from: Sander on April 18, 2010, 09:07:01 AM

Maybe it all sounds a bit weird, but these thoughts are just in my head;)

You should et out more Wink

Just kidding.

You could try a different capacitor value in the presence circuit in order to change the frequency point of same.


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Respect for the big guy's work....we're at this part of the forum because of HAD's amps.

Sander
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Re: Fizzyness

« Reply #17 on: April 18, 2010, 09:51:07 AM »

Wow I'm learning more and more. Cool

I think 95% of the problem is actually in the presence control! I used to have it round 3. Now I put it at lets say 0.75 and the fizzynes is more or less gone...? I raised the treble a bit and its getting better!

But now I really miss a bit of, how should I say it, 'life' in the sound. It could be more present Wink

! (like it's a bit caught in the speakers and not comming out all the way)

Is there a way to have some more presence, as in cutting through the mix, without adding the high end fizz (hair on the notes)... Huh?


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erwin_ve
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Re: Fizzyness

« Reply #18 on: April 18, 2010, 06:12:34 PM »

The problem isn't fizzyness. Setting the presence low is masking the problem.

I've modded 3 different OTS with marshall style heater wiring that had this problem.

Floating heater wires(like Fender) does not mess up your tone. Grid and cathode wires are sensitive to the magnetics produced by the heater wires.

It is possible to lift the cathode grid an plate wire a bit so don't touch the marshall style heater wire. But the Fender way is better IMO.


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