RICK FITZPATRICK
New member
By the way, spelling is not one of my finer points, and according to some people, neither is my personallity. Please take no offence to my questions.
Thanks again.
fitz
Thanks again.
fitz
John Sayers
Solar Power!!
they redesigned them, well actually someone else did- yeah barefoot - I know what you are saying - speaker design has made dramatic leaps since those days, but I still look back at those UREI's with fond memories. I made heaps of albums on them in the late 70s.
BTW I was speaking with a local oz speaker designer who sells speakers to the hifi trade and he said that a mathematician in Sydney actually came up with a formula for box design that is now standard - do you know if this guy??
cheers
John
barefoot
barefootsound.com
Why of course!John Sayers said:
It's actually two Aussies.
Any speaker designer worth his weight in kangaroo droppings should know who Neville Thiele and Richard Small are!
They helped lay the scientific foundations for all modern ported speaker designs, which also happen to be virtually ubiquitous these days.
Props to the Aussies!
barefoot
RICK FITZPATRICK
New member
Mr. Barefoot, I have a question regarding ported boxes. In the 1960's, Leo Fender manufactured a guitar amp called a Showman. The speaker box had one JBL 15" D-130. I opened the box and discovered something quite unusual for the time. It had 2 baffles plus the back. The 2 baffels were 2" apart, with the rear baffle cut back from the box ends about 2". They were seperated by wood cleats.
On the rear baffle, was mounted a steel ring which encompassed the speaker. This steel ring was mounted through a cutout through the rear baffle from the rear and was fastened by an exterior flange. This ring extended through a cutout in the front baffle that was 1" larger in diameter than the ring, which created a 1/2" gap between the cutout and the ring. The speaker was mounted on the ring by an interior flange flush with the front baffle. Would this gap be considered a port? I've always wondered about that.
This amp also had another interesting attribute. Its vibrato. When the vibrato was turned on, the whole cone of the JBL moved in and out of its stationary position(visual)
by at least a half an inch. The amount of movement was controlled by the depth pot.
The speed at which it moved was, naturaly, controlled by the speed pot. I've yet to see this type of vibrato on any other amp since. It was an astounding sound. You can hear it on a few of the early Beach Boy records, and surf type music from the 60's. I was wondering if you have ever seen this type of thing, and what causes it. Thanks for any input.
fitz
On the rear baffle, was mounted a steel ring which encompassed the speaker. This steel ring was mounted through a cutout through the rear baffle from the rear and was fastened by an exterior flange. This ring extended through a cutout in the front baffle that was 1" larger in diameter than the ring, which created a 1/2" gap between the cutout and the ring. The speaker was mounted on the ring by an interior flange flush with the front baffle. Would this gap be considered a port? I've always wondered about that.
This amp also had another interesting attribute. Its vibrato. When the vibrato was turned on, the whole cone of the JBL moved in and out of its stationary position(visual)
by at least a half an inch. The amount of movement was controlled by the depth pot.
The speed at which it moved was, naturaly, controlled by the speed pot. I've yet to see this type of vibrato on any other amp since. It was an astounding sound. You can hear it on a few of the early Beach Boy records, and surf type music from the 60's. I was wondering if you have ever seen this type of thing, and what causes it. Thanks for any input.
fitz
knightfly
GrouchyOldFartOnBatteries
Hey Rick, are you sure you're not talking about Tremolo? Vibrato is a rhythmically changing PITCH, while Tremolo, which WAS popular in the 60's, is a rhythmically changing VOLUME. Just curious... Steve
RICK FITZPATRICK
New member
Hi Steve, I understand what your talking about. To me, the old showman was neither. LOL It is unlike any vibrato or tremelo I've ever used, and I've used most of them. From Leslies, to Magnatones, to Vox interpretations of Magnatones. The lable says vibrato. I say its not. It does have an almost pitch bend sound to it, but its not really.
Maybe because the speaker cone moved. I have a feeling though, that if you used it all the time you would be changing JBL's often! Ha. But I sure loved it. I've been looking for a GOOD one for over a year. Rare beasts. I had the first one in Sacramento. I think. Had the first dual showman too! Different amp. I didn't like it at all. To brittle. No tone to me. I tried at least 10 guitars through it, but no luck. Untill I got a Gibson 175. Liked that one. Then a Trini Lopez(who the hell was that!) that was ok, but then I found a small delux with a SRO in it and with a SG that did the trick for a while. I get bored easily. Best amp I ever used was a music man 212. Loved it. Only with strats though. That was during my country days. Ha! Still love to hear pedal steel. Oh boy if I only could play one.
Say Steve, did you read my reply to your suggestion
The only thing I could figure out, was because of my embarrassment to long posts(books)I tried to shorten them, but all I did was cut out the words that supported what I really wanted to say. I think you mistook something. I respect you guys, and would never intentionally step on your toes. I may not be as adept as you are at short intelligent statements, but I'm interested in what you have to say, so why would I be shitty with you? Anyway, my apology if I wrote something that offended you. Seems like I'm always saying I'm sorry to someone and don't even know what I did. Maybe your right
I'm irish, maybe thats it. I don't think that causes verbosity though.
fitz
Maybe because the speaker cone moved. I have a feeling though, that if you used it all the time you would be changing JBL's often! Ha. But I sure loved it. I've been looking for a GOOD one for over a year. Rare beasts. I had the first one in Sacramento. I think. Had the first dual showman too! Different amp. I didn't like it at all. To brittle. No tone to me. I tried at least 10 guitars through it, but no luck. Untill I got a Gibson 175. Liked that one. Then a Trini Lopez(who the hell was that!) that was ok, but then I found a small delux with a SRO in it and with a SG that did the trick for a while. I get bored easily. Best amp I ever used was a music man 212. Loved it. Only with strats though. That was during my country days. Ha! Still love to hear pedal steel. Oh boy if I only could play one.
Say Steve, did you read my reply to your suggestion
The only thing I could figure out, was because of my embarrassment to long posts(books)I tried to shorten them, but all I did was cut out the words that supported what I really wanted to say. I think you mistook something. I respect you guys, and would never intentionally step on your toes. I may not be as adept as you are at short intelligent statements, but I'm interested in what you have to say, so why would I be shitty with you? Anyway, my apology if I wrote something that offended you. Seems like I'm always saying I'm sorry to someone and don't even know what I did. Maybe your right I'm irish, maybe thats it. I don't think that causes verbosity though.fitz
knightfly
GrouchyOldFartOnBatteries
Hey Rick, we're totally cool - go back and check the post on the mixing handbook, hope I 'splained it better the second time... Steve