Hi all i just got a tube amp it has 1 driving 3 tubes i think its a palomar?? because the outside looks like my palomar 200. It has a black case and a whiteish face, but the tubes stand up and dont lay flat like the 200. tubes dont have Numbers on them but i think they are 8950?? The problem is the stand bye switch. It needs one and they are four loose wires three beige and one black, switch say operate and stand bye, need help to know were wires go. Tryed to post pic but comps not letting me. Only can e-mail pics. Thanks any info helpful.
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Tube amp ??
- Thread starter Number15
- Start date
Got switch in but recieve not working and no power output???? anyone know???? Tube all lite up (new). #15 YEA RELAY NOT KICKING ON ?????????
Number15 said:
It's a Palomar "Skipper 300", the tubes are 8950's.
Leave the pre-amp (receive amp) in the off position; you should have receive thru to your radio.
The tubes come on so, that also means that you have voltage to the keying circuit. As the amp sits now, when you key the microphone do any of the relays click?
If you have a DC voltmeter that reads 1000 volts, check and see if there's any B+ on the plates of the tubes when you key the mic.
The high voltage for the tubes also run thru the standby switch (the switch completes the circuit on the "bottom" of the transformer) so, with the amp unplugged and discharged, see if you can trace one wire back to the transformer.
The circuit is on CB Tricks under Palomar Skipper 300.
Number15 said:
It's a Palomar "Skipper 300", the tubes are 8950's.
Leave the pre-amp (receive amp) in the off position; you should have receive thru to your radio.
The tubes come on so, that also means that you have voltage to the keying circuit. As the amp sits now, when you key the microphone do any of the relays click?
If you have a DC voltmeter that reads 1000 volts, check and see if there's any B+ on the plates of the tubes when you key the mic.
The high voltage for the tubes also run thru the standby switch (the switch completes the circuit on the "bottom" of the transformer) so, with the amp unplugged and discharged, see if you can trace one wire back to the transformer.
The circuit is on CB Tricks under Palomar Skipper 300.
:roll: :roll: :roll: :roll: :roll: :roll: :roll:
Boy, the forum is really slow and it is doubling the messages.
:roll: :roll: :roll: :roll: :roll: :roll: :roll:
OK, I think that you have the HV pole of the switch wired properly. If you are seeing B+ volts when you key the mic then Rly-1 is actuating (in the drawing, you will see contact 1b (NO) from the high voltage winding going to the pole of the Stby sw).
There are 3 relays; Rly-1 is the main relay, Rly-2 is for the receive amp and only actuates if the switch is in the "ON" position and Rly-1a contact is in the NC position. When Rly-1a is in the NO position, there is power to Rly-3 the antenna switch relay.
For trouble-shooting purposes I would replace the 2 PNP transistors on the PCB; that will either fix the problem or change the symptoms. Any PNP switching transistors will work.
Mel
Boy, the forum is really slow and it is doubling the messages.
:roll: :roll: :roll: :roll: :roll: :roll: :roll:
OK, I think that you have the HV pole of the switch wired properly. If you are seeing B+ volts when you key the mic then Rly-1 is actuating (in the drawing, you will see contact 1b (NO) from the high voltage winding going to the pole of the Stby sw).
There are 3 relays; Rly-1 is the main relay, Rly-2 is for the receive amp and only actuates if the switch is in the "ON" position and Rly-1a contact is in the NC position. When Rly-1a is in the NO position, there is power to Rly-3 the antenna switch relay.
For trouble-shooting purposes I would replace the 2 PNP transistors on the PCB; that will either fix the problem or change the symptoms. Any PNP switching transistors will work.
Mel
lords
Active Member
or how about just wiring the standby/transmit being wired Wrong?
how do we know it wired right? the tubes will be lit no mater what!
how do we know it wired right? the tubes will be lit no mater what!
lords said:
Could be.
4 wires, one wire has 350 volts AC, it goes to the pole of the Stby SW; there is a wire coming from the the junction point of the electrolytics, this wire goes to the NC side of the switch.
On the other side of the DPDT stby sw, one wire has a very low resistance to ground; that wire goes to the other pole of the switch. The last wire is at 0 v potential in standby and 12 vdc when the amp is keyed; it goes to the NC side of the switch.
If the "Relay-logic" is correct and it does not actuate the relays then the keying circuit is suspect.
ok i will check wires again to make sure its wired right, but the recieve/preamp switch that is next to the standbye is not working ???
lords
Active Member
Number15 said:
the switch itself ??? if that switch is wired right then its the transistors dude ,like paws264 said
Thanks guys i will try to find me some tranostors and replace them to see whats happening Thanks .
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