Hey all. I'm building my own amp based on the early Sunn Model T and I need some help. Sunn's are nonexistant here in Australia so I'm having trouble finding one to compare it to. I need the chassis dimensions as well as the head cabinet dimensions... plus any photos of the innards that anyone can get together.
Any help would be appreciated...
Help with a Sunn Model T project
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tonyjackyl
- Posts: 1
- Joined: Mon Oct 26, 2009 4:35 am
Re: Help with a Sunn Model T project
I used to own a Model T back in the 70's. I played a lot of gigs with that amp and never had a problem of not being heard. 
I don't have the amp anymore so I can't get pictures for you but there are some things I remember about it.
The entire enclosure was 24 inches wide and was made of 3/4" material. This means the chassis would have been about 22 1/4 wide (there was a little gap on each side). The chassis was approximately 8 inches deep and about 2 1/2 inches tall. Maybe a bit taller. It was made of .062 steel, galvanized or zinc plated.
Output transformer and power transformer were mounted on opposite ends of the chassis, towards the back. There were two chokes in it, smaller in size, about the size of a fender reverb transformer. They were wired in parallel (to handle current I presume since, if I recall, they were before the 4-6550's plate supply. Check the schematic to verify. These chokes were mounted inside the chassis on the end closest to the PT.
The whole amp was wired point to point on terminal strips that were riveted directly to the chassis. Very neatly done too. All wires were run in neat runs and tied with a small diameter plastic type tubing/tie material.
The five input jacks on the front were isolated from the chassis and grounded someplace, can't remember where but probably close to the first tube.
It had an impedance switch for 2, 4, 8, 16 ohms output.
There was a circuit breaker instead of a fuse for the power.
The amp was loud. I have a permanent hearing loss, mostly because of this amp.
It worked pretty good for bass too.
With Tung Sol 6550's (the real deal, not the reissues) it would put out 150 watts clean. With later 6550 tubes (such as available now) it would *only* do about 120.
Did I mention the amp was loud?
It was loud.
Have fun, wear ear plugs (I really wished I would have).
I don't have the amp anymore so I can't get pictures for you but there are some things I remember about it.
The entire enclosure was 24 inches wide and was made of 3/4" material. This means the chassis would have been about 22 1/4 wide (there was a little gap on each side). The chassis was approximately 8 inches deep and about 2 1/2 inches tall. Maybe a bit taller. It was made of .062 steel, galvanized or zinc plated.
Output transformer and power transformer were mounted on opposite ends of the chassis, towards the back. There were two chokes in it, smaller in size, about the size of a fender reverb transformer. They were wired in parallel (to handle current I presume since, if I recall, they were before the 4-6550's plate supply. Check the schematic to verify. These chokes were mounted inside the chassis on the end closest to the PT.
The whole amp was wired point to point on terminal strips that were riveted directly to the chassis. Very neatly done too. All wires were run in neat runs and tied with a small diameter plastic type tubing/tie material.
The five input jacks on the front were isolated from the chassis and grounded someplace, can't remember where but probably close to the first tube.
It had an impedance switch for 2, 4, 8, 16 ohms output.
There was a circuit breaker instead of a fuse for the power.
The amp was loud. I have a permanent hearing loss, mostly because of this amp.
It worked pretty good for bass too.
With Tung Sol 6550's (the real deal, not the reissues) it would put out 150 watts clean. With later 6550 tubes (such as available now) it would *only* do about 120.
Did I mention the amp was loud?
It was loud.
Have fun, wear ear plugs (I really wished I would have).