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Who works on Texas Star amps?

Texas Star DX 400 - DX 500CB-Tricks.com
DX 400 and DX 500 PARTS LIST

Capacitors


Ref. No.
ValueNOTES:
C1
15pFCeramic Disc
C2
0.022uF to .1uFCeramic Disc
C3
1000pFCeramic Disc
C4
1000 uF 16vElectrolytic
C5
150pFCeramic Disc
C6
330pFCeramic Disc
C7
0.068 uF TO .1uFGlass, Ceramic Disc or Monolithic
C9
0.068 uF TO .1uFGlass, Ceramic Disc or Monolithic
C20
120pF (DX400)Silver Mica
330pF (DX500)Silver Mica
C21
0.068uF to .2uFGlass, Ceramic Disc or Monolithic
C22
0.0015uF (DX400)Polypropylene
0.0012uF (DX500)Polypropylene
C23
0.068uF to .2uFGlass, Ceramic Disc or Monolithic
C24
330pFSilver Mica
C25
330pFSilver Mica
C26
0.068 uF TO .1uFGlass, Ceramic Disc or Monolithic
C27
1200pF (DX400)Stacked Mica (SEMO)
1000pF (DX500)Stacked Mica (SEMO)
C28
0.068 uF TO .1uFGlass, Ceramic Disc or Monolithic
C29
0.01uFCeramic Disc or Monolithic
C30
0.068uF to .2uFGlass, Ceramic Disc or Monolithic
C31
0.0015uF (DX400)Polypropylene
0.0012uF (DX500)Polypropylene
C32
0.068uF to .2uFGlass, Ceramic Disc or Monolithic
C33
330pFSilver Mica
C34
330pFSilver Mica
C35
0.068uF TO .1uFCeramic Disc or Monolithic
C36
1200pF (DX400)Stacked Mica (SEMO)
1000pF (DX500)Stacked Mica (SEMO)
C37
0.068 uF TO .1uFCeramic Disc or Monolithic
C38
0.01uFCeramic Disc Monolithic
C39
0.068 uF TO .1uFCeramic Disc Monolithic
C40
33uF 25vElectrolytic
C42
0.068 uF TO .1uFGlass, Ceramic Disc or Monolithic
C43
10uF 25vElectrolytic
C44
0.01uFCeramic Disc Monolithic
C45
91pFSilver Mica

Resistors

Ref. No.
ValueNOTES:
R1
470 ohm 1/4WCarbon
R2
10 ohm 2W (DX400)Metal Oxide
R4
120 ohm 2W (DX400)Metal Oxide
200 ohm 2W (DX500)Metal Oxide
R5
75 ohm 4WMetal Oxide
R6
6 ohm 4WMetal Oxide
R8
68KCarbon
R9
470Carbon
R14
100 ohm 2WMetal Oxide
R16
1.8 ohm 1/2WCarbon
R17
39 ohm 3WMetal Oxide
R18
10 ohm 1/2WCarbon
R19
10 ohm 1/2WCarbon
R20
39 ohm 3WMetal Oxide
R21
25 ohm 5WWire Wound
R23
1.8 ohm 1/2WCarbon
R24
39 ohm 3WMetal Oxide
R25
10 ohm 1/2WCarbon
R26
10 ohm 1/2WCarbon
R27
39 ohm 3WMetal Oxide
R28
25 ohm 5WWire Wound
R29
100 ohm 2WMetal Oxide
R30
15K ohm 1/4W (DX400)Carbon
30K ohm 1/4W (DX500)Carbon
R31
1K ohm 1/4WCarbon
R32
27K ohm 1/4WCarbon

Diodes

Ref. No.
ValueNOTES:
D1
1N4001
D2
1N4148
D3
MR750
D4
1N4148

Toroids

Ref. No.
ValueNOTES:
L3
Toroid CombinerBifiliar (5 Turns #22) on 30MHz Ferrite Toroid Core ½" O.D., ¼" I.D. 1/8" x 1/8" Thick.
L4
Toroid CombinerBifiliar (5 Turns #22) on 30MHz Ferrite Toroid Core ½" O.D., ¼" I.D. 1/8" x 1/8" Thick.

Transistors

Ref. No.
ValueNOTES:
Q1
2N2907A
Q2
2N4125
Q4 - Q7
2SC2290(DX400)
2SC2879(DX500)

Jacks

Ref. No.
ValueNOTES:
J1
SO239RADIO
J2
SO239ANT
J3
1/8 PhoneKey

Fuses

Ref. No.
ValueNOTES:
F1
Fuse Holder with 35A Fuse
F2
Fuse Holder with 35A Fuse

Lamps

Ref. No.
ValueNOTES:
I1 - I4
18v 40ma Lamp
I5
#2682 14v 80ma Lamp



Ref. No.
ValueNOTES:
S1-S4
4 Position Switch Bank
Button Bezel
Lens (POWER)
Lens (REC AMP)
Lens (SELECT A WATT)
Lens (DELAY)



Ref. No.
ValueNOTES:
T1
Stackpole 5 Turns(DX400)
Stackpole 2 Turns(DX500)
T2
Stackpole 4 Turns
T3
Stackpole 5 Turns(DX400)
Stackpole 2 Turns(DX500)
T4
Stackpole 4 Turns
FB1-FB8
Ferrite Bead13/64" Dia. x 7/16 long





'that's great, is there a diagram with the parts locations?
I
That's great, is there a diagram with the parts locations?
I'm trying to see how to get the picture's out of my file's on my laptop.
 
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Hope this one work's Let me know
Also you need to check the bias before you put RF into the amp or it will blow those Transistor's. 0.676 / 0.68 Bias Volt Setting would be good. I would've put HG2879's in there to replace those DEI's they would run better and also, I would replace the Output Capacitor's with 1000pf Metal Clads. Test the Input SWR normally there set pretty good already then check the Output power with the Cap that's in there. If you could remove the Caps you could use a 1000pf Silver Mica Cap to test it to see if there's difference in Output power. Eiter way that should keep the Reflect low between the Radio and Amp. I hope this will help Let me know.
Hope this one work's Let me know
This is how you set the Bias Volts for these Amps.
 
Well after a near complete disassembly, trace repair, some parts replacements and tons of cleaning this is where I'm at. Much better looking than where it started and slowly getting it back together with little times available.

Please don't be too harsh with the criticism.
20231111_102248.jpg20231111_102323.jpg20231111_102343.jpg20231111_202237.jpg20231111_202303.jpg20231111_202308.jpg20231111_202525.jpg
 
Well after a near complete disassembly, trace repair, some parts replacements and tons of cleaning this is where I'm at. Much better looking than where it started and slowly getting it back together with little times available.

Please don't be too harsh with the criticism.
View attachment 66266View attachment 66267View attachment 66268View attachment 66269View attachment 66270View attachment 66271View attachment 66272
How'zit by looking at the combiner it shows signs that it got hot. If you test that 100ohm 2w metal oxide resistor it might be bad and it will blow those DEI transistors in that section. The splitter on the input should be alright. Do you have a transistor tester like those DS55 or so? I would test those transistors before putting everything back together. If it's okay what's your email so I can drop you my number.
 
How'zit by looking at the combiner it shows signs that it got hot. If you test that 100ohm 2w metal oxide resistor it might be bad and it will blow those DEI transistors in that section. The splitter on the input should be alright. Do you have a transistor tester like those DS55 or so? I would test those transistors before putting everything back together. If it's okay what's your email so I can drop you my number.
Nothing ever got hot, it was never even powered up. There was tons of flux all over everything but after it was all cleaned up was all good. Report comic soon.
 
Nothing ever got hot, it was never even powered up. There was tons of flux all over everything but after it was all cleaned up was all good. Report comic soon.
Cool brother almost there then. Just watch that video to manually key the amp and set the bias before you hookup the radio to it. Then it should be all good.
 
Gentlemen, it turned out to be a success. All assembled, checked bias impedance and voltage and checked good.
Pass through tune about 1.2:1 and with amplifier on it actually was just a tad lower at about a 1.1. With about 4 watts in I got about 100 watt carrier with little swing because the test radio swings very little and the power supply peters out. So far so good. Tomorrow I'll put it on the bigger supply with a swinging radio to see if anything gives but I don't expect it to.

I appreciate all of your help Gentlemen!
20231112_185210.jpg20231112_185504.jpg20231112_185513.jpg20231112_185521.jpg20231112_185527.jpg20231112_185316.jpg
 
I'm looking and I can't see the catastrophe that was. You seem to have done a bang up job it looks great!
You still shouldn't have had to go though all that but you've made lemonade out of the lemon!
 
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I'm looking and I can't see the catastrophe that was. You seem to have done a bang up job it looks great!
You still shouldn't have had to go though all that but you've made lemonade out of the lemon!
Thankfully that was the case my friend. Makes me wonder though, if I had been a regular consumer and just put power to it. 2 broken traces, the delay diode was incorrect, the electrolytic leg not even on the pad, blobs galore creating shorts...... how would that have turned out for an everyday consumer? It may have let out magic smoke, not operated at all, who knows.... and what kind of support would they have received? It really is sad!

Thankfully, I have some abilities and the fine folks of wwdx to help a brother out!
 
Last edited:
Some of you were following my fun with the dx500 that in the end turned out well.

So today I received a surprise package from Texas star with a complete parts list aside from the transformers or pills. Not too shabby in the end to have replacement parts for if ever needed!
View attachment 66490
Good to see that, I am surprised to see the switch gang included.
It restores some faith that they did not leave you hanging.
Still makes you wonder about testing before they get shipped.

73
Jeff
 
Good to see that, I am surprised to see the switch gang included.
It restores some faith that they did not leave you hanging.
Still makes you wonder about testing before they get shipped.

73
Jeff
Yeah I was surprised to see the switch bank and meter in there too. Hey, in the end I'm appreciative that they didn't leave me high and dry.
 

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