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A Technical thought!
Posted:
17 Sep 2009, 18:37
by Amanda
Hi all,
Here's an interesting thought:
You have an amplifier, say a Vox AC15, it has a tapped output transformer
giving 15 ohm and 8 ohm speaker impedances.
The question is, is the output stage better loaded with a 15 ohm speaker
which uses the whole of the secondary winding or using an 8 ohm speaker
which effectively leaves the winding between 8 and 16 ohms unterminated!
I know what I think, what are your thoughts?
Amanda
Re: A Technical thought!
Posted:
17 Sep 2009, 19:22
by noelford
valvewhiz wrote:Hi all,
Here's an interesting thought:
You have an amplifier, say a Vox AC15, it has a tapped output transformer
giving 15 ohm and 8 ohm speaker impedances.
The question is, is the output stage better loaded with a 15 ohm speaker
which uses the whole of the secondary winding or using an 8 ohm speaker
which effectively leaves the winding between 8 and 16 ohms unterminated!
I know what I think, what are your thoughts?
Amanda
Amanda, you lost me on 'Here's...' The only thing I know about amps is what comes out of the front! As I've said before, I bow to your wisdom on all things ampish and honestly wish I had a hundreth of your expertise in that area.
Cheers
Noel
Re: A Technical thought!
Posted:
17 Sep 2009, 19:54
by rogera
In either case the output stage will be loaded equally well.
Re: A Technical thought!
Posted:
17 Sep 2009, 22:37
by dave robinson
Just plug in and crank the bugger up . . . . . . .
Re: A Technical thought!
Posted:
17 Sep 2009, 22:48
by Amanda
rogera wrote:In either case the output stage will be loaded equally well.
Hi Roger,
Exactly as I thought or knew!
On another note I got a Line 6 spider 2 30w amp in for repair,
both output chips exploded!
Amanda
Re: A Technical thought!
Posted:
19 Sep 2009, 20:19
by steelystrings
Hi Amanda,
my thoughts on this (takes me back a few years) I would go for the full winding, apart from greater saturation of the core, you would reduce the current flow in the speaker winding. Less chance of a burn-out.
Steve.
Re: A Technical thought!
Posted:
19 Sep 2009, 20:52
by Didier
valvewhiz wrote:Hi all,
Here's an interesting thought:
You have an amplifier, say a Vox AC15, it has a tapped output transformer
giving 15 ohm and 8 ohm speaker impedances.
The question is, is the output stage better loaded with a 15 ohm speaker
which uses the whole of the secondary winding or using an 8 ohm speaker
which effectively leaves the winding between 8 and 16 ohms unterminated!
I know what I think, what are your thoughts?
Amanda
I guess it could be an important matter in high-end Hi-Fi, not sure it's the case for guitar amps...
Didier
Re: A Technical thought!
Posted:
23 Sep 2009, 20:34
by Amanda
As I said earlier it was a Rhetorical question.
I prefer the idea of a 15 ohm speaker, which is lucky because my Audiom 60 is!
Next time i've got the scope out I may just take a look at what's going
on on the 8 to 16 ohm section of the transformer!
Amanda