Xits X10 = liverpool half power?

[Reeltarded]

On AC30s, the treble and cut oppose each other in a very kind (and I contend signature) way.

Boosting the treble makes the amp more uhhnky, and then cutting to taste brings perfection. They aren't redundant in a way I can imagine.

Just sayin'..

[pamaz67]

On AC30s, the treble and cut oppose each other in a very kind (and I contend signature) way.

Boosting the treble makes the amp more uhhnky, and then cutting to taste brings perfection. They aren't redundant in a way I can imagine.

Just sayin'..

That could be true if you have an ac30 with the same type of tranmsformer, layout etc and with blue alnicos that are generous in the high end.
I usually use loudspeakers that are more relaxed and with a smooth hi end (red white and blues as an example) so the hi cut in my case is automatic.

[Gaz]

Oops! I was thinking "voltage divider" when I read "RC Filter." Sparked an interesting discussion nonetheless!

[pamaz67]

I'ìve tried swapping a little components in order to soften a little the character of the distortion, but nothin has been smooth enough for my tastes.
So I've tried the rc filter with a 250k pot and 4.7 nF and found a satisfactory setting with a pot value around 80 kohm.
I think that this value can be increased up to 100-120k with brighter speakers.

[surfsup]

Seems Rhinson guessed that one dead on with 120k and 4n7...I used those values as well. Thanks for the report Paolo!

[rhinson]

Seems Rhinson guessed that one dead on with 120k and 4n7...I used those values as well. Thanks for the report Paolo!

cool! i have built a LOT of stuff with the ac30 p.i. and cut over the yrs, so that was just an experienced guess. i plan on building one of these when i get the chance. to me it just looks like a rearrangement of the komet pre (with tone controls after the 2nd stage instead of fender/twreck fashion after the 1st) going into an vox styled p.i. another interesting way to knock back gain would be to use a plate split load (like the komet---and many other vintage amps) on any one of the stages---take your pick)----i may experiment with this when i get around to building one. rh

[Gaz]

I'ìve tried swapping a little components in order to soften a little the character of the distortion, but nothin has been smooth enough for my tastes.
So I've tried the rc filter with a 250k pot and 4.7 nF and found a satisfactory setting with a pot value around 80 kohm.
I think that this value can be increased up to 100-120k with brighter speakers.

Sorry, but don't you mean that the resistance could be decreased with brighter speakers? Since a cut control cancels out high frequencies by phase cancellation, wouldn't less resistance between both sides of the PI cancel out more gain in the high frequencies?

[surfsup]

I may be wrong here but i think the formula is f=1/(6.3*R*C)

EDIT:

Since R is inverse, increasing R will cut at a slighly lower frequency (oops, PASSING more highs)...

80k is 425Hz cutoff
120k is 281Hz cutoff

But, since this is at the PI, there will be no second, third harmonics will there? So really you're just letting a little more low frequency through, the highs are in-effect, unaffected?

[Masco]

I'ìve tried swapping a little components in order to soften a little the character of the distortion, but nothin has been smooth enough for my tastes.
So I've tried the rc filter with a 250k pot and 4.7 nF and found a satisfactory setting with a pot value around 80 kohm.
I think that this value can be increased up to 100-120k with brighter speakers.

Sorry, but don't you mean that the resistance could be decreased with brighter speakers? Since a cut control cancels out high frequencies by phase cancellation, wouldn't less resistance between both sides of the PI cancel out more gain in the high frequencies?

+1

I also think an adjustable cut control is essential. My 2 cents.

[pamaz67]

I may be wrong here but i think the formula is f=1/(6.3*R*C)

EDIT:

Since R is inverse, increasing R will cut at a slighly lower frequency (oops, PASSING more highs)...

80k is 425Hz cutoff
120k is 281Hz cutoff

But, since this is at the PI, there will be no second, third harmonics will there? So really you're just letting a little more low frequency through, the highs are in-effect, unaffected?

sorry. You are perfectly right.
I was saying that just on a feeling because I've found that there is a spot on the pot ( linear, not log as in the original)) in which with a small rotation you get a lot of change in the cut.
So probably if in my amp it's fine around 80k, probably with a brighter speaker you'll go around 60k.
It was just a feeling and i was saying that just by thinking at the rotation, not looking at the values. But I mistook the "direction " of the change

[Lonely Raven]

So, question for you experienced builders:

If I were to clone an X-10, is it typically possible to get these same transformers from MM that XITS uses? Or do they usually do some exclusive contract?

[surfsup]

I think it was said, no, because it is a custom build for an OEM. But if we "knew" the PT/OT ratings, we can order the same ratings from somewhere else i.e. edcor.

Ultimately since the X10 has 1k5W Rs on the AC side, these PTs must be something like 400-0-400s IF the B+ is to be expected around 325V

[Lonely Raven]

I think it was said, no, because it is a custom build for an OEM. But if we "knew" the PT/OT ratings, we can order the same ratings from somewhere else i.e. edcor.

Ultimately since the X10 has 1k5W Rs on the AC side, these PTs must be something like 400-0-400s IF the B+ is to be expected around 325V

But, say if I had one on hand to measure...could I get the info I needed without pulling the transformers, or special tools or anything? I mean, I have a good DMM, that's about it.

[surfsup]

Of course.

My point is with those 1k5Ws why spend the money on a heavier iron if we can go with a smaller one. Unless the X10 has achieved purist status in cloning like a 'wreck -gasp-

[Colossal]

So, question for you experienced builders:

If I were to clone an X-10, is it typically possible to get these same transformers from MM that XITS uses? Or do they usually do some exclusive contract?

No, sorry, Mercury will not disclose information about or sell you transformers made for another builder.