Model T cab

[SG]

I just received a 70's Model T head and 412s speaker cab. The cab is rated at 4 ohms and has two speaker jacks (as does the head). How are these cabs wired? There is nothing on the cab indicating that it is wired mono or stereo.

Do I need to plug both jacks on the cab to both jacks on the head, or can I connect just one jack on the head to one jack on the cab? Also, can I set the impedance selector to either 4 or 2 ohms?

Thanks in advance for any help with this.

[Geoff]

Hey SG,

I think I've got the same setup.  4 "Sunn Transducers" @ 16 ohms a piece, wired in parallel.  The two jacks in the back are wired together, so one can act as input and one as output to another cab.

I'd suggest running the amp at the 4 ohm selector switch to be safe -- if you daisy chain cabinets, make sure you adjust accordingly.  The simple way to verify the impedence is just to hook what you're going to plug into the amp up to your mulitester.

I LOVE SUNN AMPS!

Good luck,
Geoff

: I just received a 70's Model T head and 412s speaker cab. The cab is rated at 4 ohms and has two speaker jacks (as does the head). How are these cabs wired? There is nothing on the cab indicating that it is wired mono or stereo.

: Do I need to plug both jacks on the cab to both jacks on the head, or can I connect just one jack on the head to one jack on the cab? Also, can I set the impedance selector to either 4 or 2 ohms?

: Thanks in advance for any help with this.

[Geoff]

P.S. I can see why you're asking here first.  What are there, like THIRTY screws on the back of that cab??!!  One of my Sunn transducers has fried and I need to remove it -- but I think I will remove them all and get them reconed or replace them just because I don't ever want to open that cab again!!

: Hey SG,

: I think I've got the same setup.  4 "Sunn Transducers" @ 16 ohms a piece, wired in parallel.  The two jacks in the back are wired together, so one can act as input and one as output to another cab.

: I'd suggest running the amp at the 4 ohm selector switch to be safe -- if you daisy chain cabinets, make sure you adjust accordingly.  The simple way to verify the impedence is just to hook what you're going to plug into the amp up to your mulitester.

: I LOVE SUNN AMPS!

: Good luck,
: Geoff

: : I just received a 70's Model T head and 412s speaker cab. The cab is rated at 4 ohms and has two speaker jacks (as does the head). How are these cabs wired? There is nothing on the cab indicating that it is wired mono or stereo.

: : Do I need to plug both jacks on the cab to both jacks on the head, or can I connect just one jack on the head to one jack on the cab? Also, can I set the impedance selector to either 4 or 2 ohms?

: : Thanks in advance for any help with this.

[SG]

Geoff,

Thanks very much for your replies.

The serial number tag on the back of my cab identifies the speakers as [4] 12" "Sunn Transducer," 4 ohm impedence, 240 RMS power rating.

When I was unpacking the cab, I expected to find the back panel replete with screws, as you describe on your cab. But there are none! There is only a seam where the back panel meets the cab, and it is tight on all four sides--definitely a sealed cab. In order to pop the back panel off, it seems like you would have to wedge something between the panel and the cab and leverage it out, but I don't know how you could do this without marring the cab, and on mine the seam is clean all the way around. I'm wondering if access is from the front.

I thought I read somewhere that Sunn cabs were produced in a couple of places (during different periods of manufacture), some in Oregon and others elsewhere (Kentucky maybe?). My serial number badge says "Tualatin, Oregon." This might account for the differences in the way the back panels are secured.

SG

: P.S. I can see why you're asking here first.  What are there, like THIRTY screws on the back of that cab??!!  One of my Sunn transducers has fried and I need to remove it -- but I think I will remove them all and get them reconed or replace them just because I don't ever want to open that cab again!!

: : Hey SG,

: : I think I've got the same setup.  4 "Sunn Transducers" @ 16 ohms a piece, wired in parallel.  The two jacks in the back are wired together, so one can act as input and one as output to another cab.

: : I'd suggest running the amp at the 4 ohm selector switch to be safe -- if you daisy chain cabinets, make sure you adjust accordingly.  The simple way to verify the impedence is just to hook what you're going to plug into the amp up to your mulitester.

: : I LOVE SUNN AMPS!

: : Good luck,
: : Geoff

: : : I just received a 70's Model T head and 412s speaker cab. The cab is rated at 4 ohms and has two speaker jacks (as does the head). How are these cabs wired? There is nothing on the cab indicating that it is wired mono or stereo.

: : : Do I need to plug both jacks on the cab to both jacks on the head, or can I connect just one jack on the head to one jack on the cab? Also, can I set the impedance selector to either 4 or 2 ohms?

: : : Thanks in advance for any help with this.

[Geoff]

Wow SG, that's kind of unusual!  Now that you mention it, I think there may be a 4x12 like you have at the local pawn shop.  I never really thought anything of it..but then again, I wasn't really looking.  The real Sunn experts can answer this, but I believe most if not all of the pre-Fender Sunn gear was manufactured in the metro-Portland area (i.e. Tualatin).  Of course, they outsourced parts...like speakers.  I think a lot of those Sunn transducers are actually Eminence -- which are made in Eminence, Kentucky.  I actually grew up about 2 miles from the Sunn locations in Tualatin...the one off of Tualatin-Sherwood road and Boones Fy., and the Amburn Industrial Park (at least, I think there were two).

Please repost if you find out how that cabinet opens up!

P.S. How do you like the sound of the T?  I'm very happy with the sound for both bass and guitar.  My bro bought me and old Sonaro w/ EL34s and power tube distortion when pushed is a little nicer than the 6550s.  I stick a Rat in front of both of them and they really sound like Billy Gibbons meets Leslie West!

: Geoff,

: Thanks very much for your replies.

: The serial number tag on the back of my cab identifies the speakers as [4] 12" "Sunn Transducer," 4 ohm impedence, 240 RMS power rating.

: When I was unpacking the cab, I expected to find the back panel replete with screws, as you describe on your cab. But there are none! There is only a seam where the back panel meets the cab, and it is tight on all four sides--definitely a sealed cab. In order to pop the back panel off, it seems like you would have to wedge something between the panel and the cab and leverage it out, but I don't know how you could do this without marring the cab, and on mine the seam is clean all the way around. I'm wondering if access is from the front.

: I thought I read somewhere that Sunn cabs were produced in a couple of places (during different periods of manufacture), some in Oregon and others elsewhere (Kentucky maybe?). My serial number badge says "Tualatin, Oregon." This might account for the differences in the way the back panels are secured.

: SG

[Ryan Phelps]

OK guys...the cab in definately front-loaded. The grille cloth is mounted to a separate frame that pops out. Then you can remove the speakers from the front (screws in t-nuts). The cab was made in Tualitin, a suburb of Portland, Oregon.  Read the history of Sunn Conrad Sundholm (founer of Sunn)provided to this website elsewhere.

Ryan

: Wow SG, that's kind of unusual!  Now that you mention it, I think there may be a 4x12 like you have at the local pawn shop.  I never really thought anything of it..but then again, I wasn't really looking.  The real Sunn experts can answer this, but I believe most if not all of the pre-Fender Sunn gear was manufactured in the metro-Portland area (i.e. Tualatin).  Of course, they outsourced parts...like speakers.  I think a lot of those Sunn transducers are actually Eminence -- which are made in Eminence, Kentucky.  I actually grew up about 2 miles from the Sunn locations in Tualatin...the one off of Tualatin-Sherwood road and Boones Fy., and the Amburn Industrial Park (at least, I think there were two).

: Please repost if you find out how that cabinet opens up!

: P.S. How do you like the sound of the T?  I'm very happy with the sound for both bass and guitar.  My bro bought me and old Sonaro w/ EL34s and power tube distortion when pushed is a little nicer than the 6550s.  I stick a Rat in front of both of them and they really sound like Billy Gibbons meets Leslie West!

: : Geoff,

: : Thanks very much for your replies.

: : The serial number tag on the back of my cab identifies the speakers as [4] 12" "Sunn Transducer," 4 ohm impedence, 240 RMS power rating.

: : When I was unpacking the cab, I expected to find the back panel replete with screws, as you describe on your cab. But there are none! There is only a seam where the back panel meets the cab, and it is tight on all four sides--definitely a sealed cab. In order to pop the back panel off, it seems like you would have to wedge something between the panel and the cab and leverage it out, but I don't know how you could do this without marring the cab, and on mine the seam is clean all the way around. I'm wondering if access is from the front.

: : I thought I read somewhere that Sunn cabs were produced in a couple of places (during different periods of manufacture), some in Oregon and others elsewhere (Kentucky maybe?). My serial number badge says "Tualatin, Oregon." This might account for the differences in the way the back panels are secured.

: : SG

[mike]

:
: I just received a 70's Model T head and 412s speaker cab. The cab is rated at 4 ohms and has two speaker jacks (as does the head). How are these cabs wired? There is nothing on the cab indicating that it is wired mono or stereo.

: Do I need to plug both jacks on the cab to both jacks on the head, or can I connect just one jack on the head to one jack on the cab? Also, can I set the impedance selector to either 4 or 2 ohms?

: Thanks in advance for any help with this.

BE VERY CAREFULL! More than likely the second jack on the back is just a parallel out to another speaker, I don't think Sunn ever manufactured any kind of stereo cabinet; if you hooked up two amps, one to each jack, you would have the eqivalent of two cars running head-on into each other, everything would fry, and you might have a fire hazzard. Now, according to my '72 catalog, the "412s" speakers were 4 ohm.

[SG]

Ryan, thanks for the helpful info.

SG

: OK guys...the cab in definately front-loaded. The grille cloth is mounted to a separate frame that pops out. Then you can remove the speakers from the front (screws in t-nuts). The cab was made in Tualitin, a suburb of Portland, Oregon.  Read the history of Sunn Conrad Sundholm (founer of Sunn)provided to this website elsewhere.

: Ryan

:
: : Wow SG, that's kind of unusual!  Now that you mention it, I think there may be a 4x12 like you have at the local pawn shop.  I never really thought anything of it..but then again, I wasn't really looking.  The real Sunn experts can answer this, but I believe most if not all of the pre-Fender Sunn gear was manufactured in the metro-Portland area (i.e. Tualatin).  Of course, they outsourced parts...like speakers.  I think a lot of those Sunn transducers are actually Eminence -- which are made in Eminence, Kentucky.  I actually grew up about 2 miles from the Sunn locations in Tualatin...the one off of Tualatin-Sherwood road and Boones Fy., and the Amburn Industrial Park (at least, I think there were two).

: : Please repost if you find out how that cabinet opens up!

: : P.S. How do you like the sound of the T?  I'm very happy with the sound for both bass and guitar.  My bro bought me and old Sonaro w/ EL34s and power tube distortion when pushed is a little nicer than the 6550s.  I stick a Rat in front of both of them and they really sound like Billy Gibbons meets Leslie West!

:
: : : Geoff,

: : : Thanks very much for your replies.

: : : The serial number tag on the back of my cab identifies the speakers as [4] 12" "Sunn Transducer," 4 ohm impedence, 240 RMS power rating.

: : : When I was unpacking the cab, I expected to find the back panel replete with screws, as you describe on your cab. But there are none! There is only a seam where the back panel meets the cab, and it is tight on all four sides--definitely a sealed cab. In order to pop the back panel off, it seems like you would have to wedge something between the panel and the cab and leverage it out, but I don't know how you could do this without marring the cab, and on mine the seam is clean all the way around. I'm wondering if access is from the front.

: : : I thought I read somewhere that Sunn cabs were produced in a couple of places (during different periods of manufacture), some in Oregon and others elsewhere (Kentucky maybe?). My serial number badge says "Tualatin, Oregon." This might account for the differences in the way the back panels are secured.

: : : SG

[Rich Briere]

Well done Ryan!  

RB