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Skilletlicker
Intermediate Member
Username: Skilletlicker

Post Number: 174
Registered: 5-2002


Posted on Tuesday, November 30, 2004 - 1:29 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

need infromation on a gemtronic gtx 5000 tubes and their lay out
skilletlicker
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Pogo12
Junior Member
Username: Pogo12

Post Number: 15
Registered: 3-2005
Posted on Sunday, June 04, 2006 - 4:03 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

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.
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Moderator1516
Moderator
Username: Moderator1516

Post Number: 334
Registered: 8-2005


Posted on Saturday, September 30, 2006 - 2:28 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

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
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Pogo12
Member
Username: Pogo12

Post Number: 77
Registered: 3-2005
Posted on Saturday, October 21, 2006 - 3:54 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

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.
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Moderator1516
Moderator
Username: Moderator1516

Post Number: 356
Registered: 8-2005


Posted on Monday, October 23, 2006 - 7:13 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

pogo 12
thanks , i have been looking but havent found it yet
moderator1516
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Pogo12
Member
Username: Pogo12

Post Number: 95
Registered: 3-2005
Posted on Tuesday, October 24, 2006 - 12:42 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

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.
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Radioreddz
New member
Username: Radioreddz

Post Number: 7
Registered: 9-2006
Posted on Wednesday, October 25, 2006 - 5:28 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

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.

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