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1968 K200-4 with (2) 15" Jensens [message #9848]

Mon, 03 November 2008 20:47

ampguy
Messages: 13
Registered: October 2008

Junior Member

Does anyone have a manual that they would zerox to allow me to understand what speaker combinations that I can hook up to the head and what impedience the (2) 15" cabinet is rated? I will reimburse you for your troubles. Thanks, AMPGUY.

AMPGUY

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Re: 1968 K200-4 with (2) 15" Jensens [message #9849 is a reply to message #9848]

Mon, 03 November 2008 21:17

LesS
Messages: 477
Registered: December 2002

Senior Member

K200's minimum impedance is 4 ohms.
So any load from 4 to 16 ohms is fine.

Basically most Kustom 2x15's were 4 ohms.
But the cabinet could have had the speakers changed, so you might want to check the impedance with a multimeter - or if you have the cabinet open, see what impedance is on back of the speakers.

[Updated on: Mon, 03 November 2008 21:20]

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Re: 1968 K200-4 with (2) 15" Jensens [message #9854 is a reply to message #9849]

Tue, 04 November 2008 10:37

C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...

Senior Member

I disagree, Les. The minimum is 4 ohms but the speakers are 16 ohm and 2 in parallel which gives 8 ohms. Then 2 cabinets would be 4 ohms.
Conrad

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Re: 1968 K200-4 with (2) 15" Jensens [message #9855 is a reply to message #9848]

Tue, 04 November 2008 12:50

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Kustom A and B serise heads that where sold with one cabinet where 4 ohm cabs, the heads that where sold with 2 cabinets got the 16 ohm drivers wired in parallel for a 4 ohm load at the head.
I beleive the Frank era heads where never sold with 2 cabs but for the PA heads, so a 8 ohm cab would be the norm.

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Re: 1968 K200-4 with (2) 15" Jensens [message #9856 is a reply to message #9848]

Tue, 04 November 2008 16:13

ampguy
Messages: 13
Registered: October 2008

Junior Member

My Cascade colored K200-4 was purchased with one cabinet holding two 15" Jensens. It is not a Frank head and I believe that it is a 1968, although the speakers date to 1966. From the replys, I'm assuming that it came with one cabinet and is 8 ohm?? So are the K200 heads rated for a maximum of a 4 ohm load (in other words, designed for two 8 ohm cabs)? Thanks. Has anyone ever seen a manual for the K200-4 amps? AMPGUY.

AMPGUY

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Re: 1968 K200-4 with (2) 15" Jensens [message #9859 is a reply to message #9848]

Wed, 05 November 2008 06:17

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

I need to correct what I posted after finding my test of the output wattage/impeadence of Kustom amps.
The frank era heads put out full wattage at 4 ohms, not 8 ohms.
This makes sence for back than when in the latter range of frank production when they changed to the latter style control knob, they also started offering the 3-15" cabs which where loaded with 16 ohm driver to get a 5.3 ohm load, the closest to 4 ohms you can get with 3 drivers.
From what I recall( 40 years latter) of my first K200s manule it call for a minium load of 4 ohms.
Maybe a board member who still has the instruction manule or remembers clearer than me can confirm this.

Ampguy, if you do a search thru old threads(like 2 years ago) you will find a post I did on the results of testing several differnet model Kustom heads for output wattage at different impeadence loads.
Does your cab have the chrome plastic port tubes? if those Jensen model C15L speakers are indeed from 66 and the cab has port tubes than the Jensens are not original to the cabinet!

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Re: 1968 K200-4 with (2) 15" Jensens [message #9860 is a reply to message #9848]

Wed, 05 November 2008 08:07

ampguy
Messages: 13
Registered: October 2008

Junior Member

The cabinet does have port tubes and is labeled a Jensen cabinet. The catalogs show Jensens were available. Why do you think that the Jensens are not original? Based on the heads serial number #29220, I am wondering whether the cabinet is original, but matched with a later production head??

AMPGUY

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Re: 1968 K200-4 with (2) 15" Jensens [message #9861 is a reply to message #9860]

Wed, 05 November 2008 09:55

LesS
Messages: 477
Registered: December 2002

Senior Member

What is the date code on your Jensen speakers?

Your K200B-4 amp SN 29220 was made approx 9/26/68 plus or minus two weeks.
Your head is a Kustom Electronics head (it does not say “by Ross” on the front panel).

You speaker cab is probably a Ross cabinet – it would have aluminum ports (not shiny chrome) and the badge would say “by Ross”.

(Kustom Electronics cabinets had shiny chrome ports and the badge would usually say “by Kustom Electronics”.)

Kustom by Ross speaker cabinets were made well after Ross amp heads production had ended in May 1968, and so it is perfectly normal to have a Kustom Electronics head with a Ross speaker cabinet.

Timeline
Ross amp heads production - 1966 to May 1968
Kustom by Ross speaker cabinets - 1966 to October 1969
Kustom Electronics speaker cabinets - November 1969 to December 1973

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Re: 1968 K200-4 with (2) 15" Jensens [message #9862 is a reply to message #9861]

Wed, 05 November 2008 10:42

ampguy
Messages: 13
Registered: October 2008

Junior Member

My cabinet says Kustom Electronics and is a Jensen laberled cabinet. The speakers, however, have dates as follows: 220-0605 and 220-0611.(C15L-87684) Should I assume that this is a late cabinet matched with this head? Also, should I assume that the cabinet is a 4 Ohm total laod or an 8 Ohm? Thanks, AMPGUY

AMPGUY

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Re: 1968 K200-4 with (2) 15" Jensens [message #9863 is a reply to message #9862]

Wed, 05 November 2008 11:26

LesS
Messages: 477
Registered: December 2002

Senior Member

Yes - your cabinet is newer than your head.
The codes do not say what the ohms are, so you need to measure each speaker with a multimeter.

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Re: 1968 K200-4 with (2) 15" Jensens [message #9865 is a reply to message #9863]

Wed, 05 November 2008 18:43

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Unless you have a Chinese made cabinet, your speakers are not original to the cab, so the date codes on the speakers (2006) will not help date the cab.

I don't know if the new Italian Jensens are available in 16 ohms, so my first guess would be that the cab is wired for 4 ohms. Of course you should check it as Les suggested.

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Re: 1968 K200-4 with (2) 15" Jensens [message #9866 is a reply to message #9848]

Thu, 06 November 2008 12:20

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

I was wondering about the his date codes also, but I have one of the new overseas made 2-15 cabs, and they do not come with the black frame large square magnet C15L Jensen drivers, they come with a green frame much smaller round magnet Jensen driver that is like a Jensen Mod serise 15-120 driver.
So like I said, I do not know whats up with those date codes if he has vintage Kustom era black frame square magnet C15L Jensens!

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Re: 1968 K200-4 with (2) 15" Jensens [message #9867 is a reply to message #9848]

Thu, 06 November 2008 15:31

ampguy
Messages: 13
Registered: October 2008

Junior Member

After more research, I have been advised that the speakers are from 1966. (Jensen (Italy) has not re-issued this speaker). Of interest they are the same speaker found in Leslies from the late 60's, so now I am wondering whether they are replacements to the original Jensens supplied with the Jensen/Kustom cabinet that I have.I do not know what model Jensen was originally supplied with Kustom cabs. One source states that they are usually 8 ohm speakers, another says 16 ohm.

AMPGUY

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Re: 1968 K200-4 with (2) 15" Jensens [message #9868 is a reply to message #9848]

Fri, 07 November 2008 06:20

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

If they are the black frame C15L drivers than they are the correct Jensen MODEL that Kustom would have installed, but like Less posted they are not original to the cabinet.
You may have a late 1990`s cabinet, a couple of ways to tell would be as such.
1) reach in one of the port tubes so you can fell the mounting lip of one of the drivers, if you feel a stud sticking thru a mounting bolt, thats one of the features not found on the 90s cabinets as the 90s versions use wood screws to mount the drivers! Pretty shabby for a bass cabinet.
2) the speaker jack mounting plate on the lower rear of the cabinet is thin square plastic mounted in a dimond position to the back, and the jack is held down to the plate with a metal nut.
The latter cabinets also use a square plastic plate but is over twice the thickness, screwed down with its top and bottom parallel to the cabs top and bottom, and the jack is held to the jack plate with a plastic nut.
3) The latter cab has no black painted fiberglass insulation glued down in it, its just the bare paticle board, which is another point as the latter cabs are made from particle board and are quite heavy(86 pounds if I recall right)the vintage cabs are made of plywood.

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Re: 1968 K200-4 with (2) 15" Jensens [message #9869 is a reply to message #9848]

Fri, 07 November 2008 07:45

ampguy
Messages: 13
Registered: October 2008

Junior Member

Well, I checked the cabinet. It uses studs to mount the speakers. It has a thin square plastic speaker mounting jack plate held down with a metal nut and the black insulation, so it appears to be a vintage cabinet. Two different speaker re-coners identified the speakers as 1966 black painted C15Ls, so perhaps the cabinet is a left over early Kustom Electronics cabinet matched with a K200-4 head from 1968?? I was surprised to learn that the speakers were the same as used in 60s Leslies. I wonder if the "L" stands for Leslie model?? The head and speaker cabinet are in the Cascade color.

AMPGUY

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Re: 1968 K200-4 with (2) 15" Jensens [message #9870 is a reply to message #9848]

Fri, 07 November 2008 08:10

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

No, Jensen model numbers go as such.
C stands for ciramic magnet, P would be a alinco magnet.
You know what the 15 means.
Jensens concert serise( the last letter of the model number) goes for S to L, as in your driver.
This range of letters goes from the most efficent (L) to lette S,
The range of volume diference across this range of models is HUGE!
A letter model L DRIVE is 3 times as loud as a model S.

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