• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

Texas Star twelve gauge


They often used whatever they were able to get the best deal on. If you got the MRF454 rather than the 2290's, you got the better transistor between the two.
 
  • Like
Reactions: AudioShockwav
While I do agree with the above statement I always thought the 1200 had the 2290 finals. Since they are crazy expensive now and have been discontinued I would wonder if someone recently rebuilt it with what they could fine. That being the 454 final. If so I sure hope they properly re-worked the amplifier for the 454 finals. They are not a direct swap.
 
  • Like
Reactions: Crusher
While I do agree with the above statement I always thought the 1200 had the 2290 finals. Since they are crazy expensive now and have been discontinued I would wonder if someone recently rebuilt it with what they could fine. That being the 454 final. If so I sure hope they properly re-worked the amplifier for the 454 finals. They are not a direct swap.
That certainly is a possibility that he may be able to confirm by simply looking at the date code on the MRF454's.
 
I always thought the 1200 had the 2290 finals.

For an amplifier that was in production for that many decades, the prevailing price of suitable transistors would determine which one it was built with. A saving of a buck per transistor would easily pay for the effort needed to 'tweak' component values to match any one particular transistor type.

Short version: They used whatever RF transistor was cheap that year and adjusted the circuit to match.

Just won't find the automotive shop-manual sort of detail, which model year used which vendor for half-axles.

Or which exact circuit details changed from year to year.

Basic rule seems to be that the older the amplifier is, the more differences you'll find between it and the published Texas Star info. Too bad there's no VIN to tell you the model year.

73
 
Too bad there's no VIN to tell you the model year.

73
The older amps have numbers on the faceplates. I believe these correspond to their production number for that model, but I could be wrong.
If that is the case, the lower the number, the older the amp. There just is no information as to what year those numbers would correspond to.
 
"may be able to confirm by simply looking at the date code on the MRF454's. "
Is that the number under MFR 454 on the transitor? If so there is 4 or 5 different numbers...not all match.
Thanks again for all the info
 
Typical "open" date code will have four digits, two for the year, two for the week of that year, 01-52.

And sometimes a 'batch' marking is what you'll see with letters and numerals. Don't know the decode for those.

73
 

dxChat
Help Users
  • No one is chatting at the moment.
  • dxBot:
    Tucker442 has left the room.
  • @ BJ radionut:
    LIVE 10:00 AM EST :cool:
  • @ Charles Edwards:
    I'm looking for factory settings 1 through 59 for a AT 5555 n2 or AT500 M2 I only wrote down half the values feel like a idiot I need help will be appreciated