Author |
Message |
Skilletlicker
Intermediate Member Username: Skilletlicker
Post Number: 174 Registered: 5-2002
| Posted on Tuesday, November 30, 2004 - 1:29 pm: |
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need infromation on a gemtronic gtx 5000 tubes and their lay out skilletlicker |
Pogo12
Junior Member Username: Pogo12
Post Number: 15 Registered: 3-2005
| Posted on Sunday, June 04, 2006 - 4:03 pm: |
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What kind of infoDo you mean. What each tube does or where they go? This radio has the same insides as a robyn240d.I think I have the book for the robyn as well as the schematics.I may can email you a pic of the layout. |
Moderator1516
Moderator Username: Moderator1516
Post Number: 334 Registered: 8-2005
| Posted on Saturday, September 30, 2006 - 2:28 pm: |
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i have an old tube type gem tronics,it is okay for an hour then shuts down ,except the tubes stay heated;it has a stand by switch on the squelch knob and it cuts out just like i was using the stand by switch. moderator1516 |
Pogo12
Member Username: Pogo12
Post Number: 77 Registered: 3-2005
| Posted on Saturday, October 21, 2006 - 3:54 pm: |
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moderator you most likely have a wire touching your chassis that is getting hot and shorting to it.Most likely it will be the plate or grid wire going to the modulator tube(6BQ5) at the front right.It was a common problem.Take a wood or plastic probe and look for a wire melted to the chassis. |
Moderator1516
Moderator Username: Moderator1516
Post Number: 356 Registered: 8-2005
| Posted on Monday, October 23, 2006 - 7:13 pm: |
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pogo 12 thanks , i have been looking but havent found it yet moderator1516 |
Pogo12
Member Username: Pogo12
Post Number: 95 Registered: 3-2005
| Posted on Tuesday, October 24, 2006 - 12:42 pm: |
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Ok let me give you more ideas but first Does it transmit and is there transmit modulation when it goes out?Check the relay contacts and voltage on the relay. Its common to both trans.and rec.Does the voltage going to the standby switch drop out when it quits?If so trace it back.It goes to part of the power supply off the main transformer.It will go to one of two red wires.Check for about 105vac across them.If its there check the 2 diodes and caps attached to it that makes a doubler circuit.It could be a tube but IM BETTING YOU TRIED THAT. Did you try checking the standby switch itself?There is a modulation transformer at the back right that my be opening up. |
Radioreddz
New member Username: Radioreddz
Post Number: 7 Registered: 9-2006
| Posted on Wednesday, October 25, 2006 - 5:28 pm: |
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i have a gemtronics gtx 5000 also with a simular problem. it does not totaly shut down but it gets very hot on the left side if ur looking at it from the front and the transmit dies and the receive gets real low. its fine at first but after an hour or so it just fall on it's face. |