Texas star dx667v turbo mod

[eric chilton]

The amplifier in question with this tread is the Texas Star DX667V and that uses a 2SC2290 driver transistor. It is this part that determines the amplifier drive requirements. Not the 2SC2879 finals. The Cobra 148GTL is a more appropriate radio to drive this amp then anything that produces 45 watts PEP.

the one i have has the 2sc2879 in it ....dont know if it came that way but they are in it ........

 

[jtrouter]

Does anyone know which potentiometer the old
Texas Star do 667v turbo mod used?
I understand some use a 100 ohm and some used a 250.
Any help would be appreciated
Thanks
Flash

Yes i know MANY years late however mine uses 100 ohm 5 watt potentiometer.

 

[vswr]

Take 100 people with any 667 made, and each person will have different readings under the conditions and equipment they are using. If a 12 volt transistor is driven with a higher voltage, and then over driven, the peaks on the scope will not increase. They will clip causing that pinched and clipped sound we often hear. I dunno but Rms is a better way than peak envelope power. If you run by PEP then thats whybthere are so many opinions.

 

[AudioShockwav]

the one i have has the 2sc2879 in it ....dont know if it came that way but they are in it ........

The 667 used a single 2290 to drive 4 2879 transistors.
Later models used two mosfets in place of the 2290.
If your amp has a 2879 as a driver it has been modified.
We have to remember that these were " designed" for older radios that struggled to reach 3.5-4 watts output with 12-16 watt peaks.
This was the reason for a driver transistor back then.
When class c competition amps showed up on the scene the rules changed somewhat.

73
Jeff