Texas Star Amplifier Repair

[long night]

Hi. I am hoping someone out here repairs texas star amps. I have a TS 500 dx in need of repair and am unable to do it myself.

Thank you Chuck Saylor

 

[Ranch55]

How old is the Texas Star 500 ?
What transistors are in it ?
Does it have a variable on the front of it ?

 

[long night]

How old is the Texas Star 500 ?
What transistors are in it ?
Does it have a variable on the front of it ?

Hi Ranch 55 It is an older TS 500 dx. Not a variable power model. Toshiba 2879 transistors. It just quit working. I tried to repair, but no luck. When you turn it on one of the wire wound resistors will start to smoke.

 

[loosecannon]

you might have a blown transistor.

remove all four 2SC2879 transistors and test them with a DMM.
(instructions for this are all over the web)

find the bad one and throw it out.

sell the rest on ebay.

buy a new amp with the profits.
LC

 

[AudioShockwav]

Can you snap a couple pictures of the boards and post?
When you say wire wound are you talking about one of the chokes ?

73
Jeff

 

[long night]

Can you snap a couple pictures of the boards and post?
When you say wire wound are you talking about one of the chokes ?

73
Jeff

Hi. I am very old school and do not have a smart phone to send pictures. Sorry. I can tell you that on cb tricks in Texas star 500 DX listed in parts you will see in transistors (R21 and R28) are listed as 25 ohm 5 watt wire wound resistors. R 21 is the one that got hot and started smoking. Hoped that helps.

 

[Greg T]

Here you go

 

[long night]

View attachment 48221 View attachment 48220 View attachment 48220 Here you go

Thank you Greg.

 

[AudioShockwav]

Look at R18 R19 R25 and R26 do they look like they have over heated?

73
Jeff

 

[9C1Driver]

you might have a blown transistor.

remove all four 2SC2879 transistors and test them with a DMM.
(instructions for this are all over the web)

find the bad one and throw it out.

sell the rest on ebay.

buy a new amp with the profits.
LC

I agree and then sell the 500 on e-bay as fix or repair showing up front that it has no finals. If he really wants to fix it best option probably will be a new matched quad of HG 2879's.

 

[long night]

Look at R18 R19 R25 and R26 do they look like they have over heated?

73
Jeff

No sign of over heating. The (R21) wire wound 25 ohm 5 watt resistor or choke resistor gets hot.

 

[Ranch55]

Maybe........hmmmm

 

[long night]

Maybe........hmmmm

Hi Ranch 55. Do you repair these? I am only learning and can be missing something you might find?

 

[Ranch55]

Private message conversation sent.

 

[long night]

Private message conversation sent.