Question about Fender (26741099) Microphone

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Fender 1000 Roc Pro Amplifier Head

I would like to know how to change the tube inside. It does not appear to have an easy access to the tube, but I know it's there (or at least should be) because this is a hybrid amp. Solid state and tube drive.
Please let me know what procedures I would have to perform that would allow me to change the tube and still have a working Amplifier when I'm done

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Hey man

The tube is on the PCB internally, you will need to pull the chassis out of the sleeve to get to it. Not hard.... Do this by removing the screws that secure it in place on the outside of the sleeve. sometimes they are a little "stuck" in there sticking to the trim covering that they have been clamped up against. The tube itself will very seldom give trouble though, as it is by circuit design way underdriven with quite low cathode volts so they don't loose their edge nor fail. Putting a different quality of tube in there wont make much of a difference in tone either because of this. the tube is only used for the gain channel, so if you have clean sound but no distortion, then it may be the problem, or the large ceramic ballast resistor R116 may have dry solder joints. If you have any questions about this, happy to talk to you. A FixYa is a great reward for helping you out. Cheers

regards
robotek

Posted on Oct 19, 2008

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Posted on Jan 02, 2017

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Unplug unit and check speakers with a multimeter to make sure they are not shorted.
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Remove all eight of the screws holding the transistor brackets & transistors to the heatsink. Look and take careful note of how the plastic insulators weave through the transistors. If you get this wrong, you can short out the whole amplifier when you turn it on.
Slide the amplifier board down and out where you can get to the bottom. Note the wires and connectors going to the small protect board over the amplifier.
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Reassemble in reverse. Be careful of reconnecting wires and insulators. Don't test until the amplifier PCB is back in place and you're sure of all wires. If the PCB is touching the power supply, you'll short it out.

Good luck, I told you this wouldn't be easy!

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