Ampeg Flat Back date help

I think the only method is to use speaker codes for dating. Do you have a picture of that?

 

Yeah speaker date code would really be the only way. The flatbacks were only made for a few years so not that large of a window either way.

 

Ya, they're right. Serial number info has been lost to the ages.

 

Not really any more than the flatback design does. Magnavox moved production to Indiana around 1974, the flatback design transitioned to the tilt back design around the same time.

 

Many flatbacks had alnico speakers, some had ceramics. You’ll never know what you have till it’s opened up. BTW, unless the speakers fasteners have been changed, you might need to find a 5/32” clutch head screwdriver.

 

Those clutch heads are a pain, but easier with the clutch head screwdriver.

 

I didn't even know those existed. Looks like a good design though.

 

They were a very good sounding cabinet. One issue is that they're limited to 240W, that's why Ampeg used to recommend two cabinets with the SVT in the early literature. The Heritage 810 is their only cabinet that sounds as good as the old flatback, an big advantage is that it has a higher wattage capacity.

 

Apologies, I know of the flat back cabs, they've got oldschool Ford Flathead V8 cool going on.

I meant the clutch head screws were new to me

 

Ampeg used them, Ford did on some old truck headlight housings, some farm tractors used them, as did Airstream on camping trailers. They were short lived and not that popular.

Given the shape, batman must have used them on the batmobile.

 

There are a surprising number of screw types that aren't all that popular. I kinda hate the standard screw, and Phillips (it's not bad, just hard to apply any real torque onto without it popping out by design), but I wish more manufacturers used torx and Robertson.