Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: 12AX7 on February 03, 2012, 05:06:27 pm

Title: Wire wound R placebo effect?
Post by: 12AX7 on February 03, 2012, 05:06:27 pm
I tried some wire wounds for my EL34 screens in place of the sand 5 watts that were there. Both 1k. Seems to sound different. Is it my ears or is this typical? I'm seriously asking....i don't know! Just don't see why it would cause any difference.
Title: Re: Wire wound R placebo effect?
Post by: jjasilli on February 03, 2012, 05:57:52 pm
Maybe the wire-wounds have more inductance or capacitance.  See:  http://answers.yahoo.com/question/index?qid=20081109052907AAj9bGw (http://answers.yahoo.com/question/index?qid=20081109052907AAj9bGw)
Title: Re: Wire wound R placebo effect?
Post by: 12AX7 on February 03, 2012, 07:01:18 pm
Wow, sounds like they well could have some capacitance,  and that would make sense considering they are more or less a coil right? Maybe thats it. I'll swap then out again and see if what i'm hearing is definite and which i like better. Thanks.
Title: Re: Wire wound R placebo effect?
Post by: HotBluePlates on February 03, 2012, 07:31:33 pm
I tried some wire wounds for my EL34 screens in place of the sand 5 watts that were there. Both 1k. Seems to sound different.

The 5w "sandbox" resistors are wirewound as well.
Title: Re: Wire wound R placebo effect?
Post by: 12AX7 on February 03, 2012, 07:54:59 pm
That would mean less chance of a difference, tho still a chance because each would create different degrees and values of capacitance i imagine.
Title: Re: Wire wound R placebo effect?
Post by: HotBluePlates on February 03, 2012, 08:16:14 pm
A coil of wire is more likely to result in inductance, since an inductor is a coil of wire. Some stray capacitance is possible, but should be very minute in a resistor.
Title: Re: Wire wound R placebo effect?
Post by: PRR on February 03, 2012, 09:06:57 pm
> 5w "sandbox" resistors are wirewound

I've seen one which was a carbon-film cast inside a ceramic shell.