• 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.
  • Notice: You may not use this site to facilitate the unauthorized selling of copyrighted material including, but not limited to, in the public dxForums, dxGallery, dxChat and private messsages. If you get caught doing this, you will be permanently banned with no second chances. A notice will be placed on the site of why you were banned and any information collected by this site about you will be made known to the copyright holder.

Texas Star 1200 DX Hotplate

turbo chicken

New Member
Sep 9, 2013
I have a Texas Star 1200 I'm looking for a good tech to upgrade this amplifier. I wanna keep the ab1 biasing but just Beef up the components and possibly add some more filtering. I wanna a clean amplifier i can be long winded on. Any suggestions for a good tech? I was told about Crusher in Ky but haven't found a contact yet.


Active Member
Dec 30, 2013
Unless you have a tech with a scope, power supplies to power it, and a spectrum analyzer, and KNOWS HOW TO USE IT, then leave it alone. Guys changing all the fixed capacitors to trimmers in attempt to get more power out of it will ruin the amplifier. Not a lot of amp builders understand the texas star designs anyways, because of the way they route the B+ to the bias supply along the same route the RF takes, and other little interesting differences between the design and typical CB amplifiers.

Can I ask...what are you trying to do? Just drive it with 70 or so watts PEAK, and give it a good voltage / current source, maybe order a fan kit for it if it doesn't have one, and leave it alone.

If you really want to, the bias circuit can be re-worked, as of right now, it is a voltage divider design, and depending on drive, and voltage source, it can, just like a lot of CB amplifiers actually change class of operation during use. (AB, B, C)


Well-Known Member
May 12, 2007
Really the only upgrade I would suggest is to regulate the bias on each 2 pill / transistor section. Doesn't matter how clean the amp can be, if you use a junk radio or a class C modulator to drive it. Then your right back at square 1.


Well-Known Member
May 12, 2007
These amps are not made to be driven hard. I would use no more than a single 2290 to drive this with. And that should be biased AB. Fan kit is a must.
  • Like
Reactions: 2 people


Sr. Member
Sep 19, 2009
This amp is not so bad in it's stock configuration. It does not suffer from RF getting into the bias supply like the smaller ones because it has a dedicated contact on another relay to switch the bias. It just has medium sized power transistors. Many used the SRF-2072.

"Beefing up" and "clean" are two different things which often oppose each other. The cost of beefing it up simply is not worth the results. If you took the time to replace all the finals with 2SC2879's you still need to rematch the input and output impedances to the new lower level in order to see the power gain.

It could easily cost $500 to do this job right and you'll gain a whopping 1/2 S-unit. That's why I say skip that goal and move onto running clean with a good duty cycle that will allow you to be long winded. This usually means reducing power below maximum ratings and adding some filtering.

Rather than running the 1200 PEP, give up a 1/2 S-unit and run the amp at 600 watts PEP. That will make a dramatic improvement with Inter Modulation Distortion. Adding external low pass filters on both the input and output of this amp will snuff out all the objectionable harmonics rather well assuming it's being used in the upper HF bands.

The last thing to address would be some fans to get rid of heat during those long transmissions.
  • Like
Reactions: 1 person

Help Users
  • No one is chatting at the moment.
  • @ AudioShockwav:
  • @ kb9ghn:
    My first thought was the i.r.s. may be interested in a long term money making scam without proper taxes being paid..probably more than electronics involved.
  • @ Toll_Free:
    My first thought was why hasn't someone paid him a visit. I mean, his address is posted above.
  • @ beakster1715:
    Good news! I opened an appeal case after eBay sided with superhawkwss6. I also opened an IC3 case & sent that information to eBay. Within an hour they responded, reversed their decision and returned all of my money. Unfortunately, superhawkwss6 stole my CB radio and eBay will likely not suspend or close his account, but rather allow him to continue his criminal activity. I think I'll still file a report with our sheriff's dept (the sheriff is a friend of mine) though I know this type of crime isn't worth their time. This guy needs to be stopped and I'm certainly going to do my best to make that happen.
  • @ ButtFuzz:
    Good Evening!