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Post subject: 65 Twin Reverb Reissue - High Pitched Noise
Posted: Sat Mar 03, 2018 6:03 am
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Hi everyone,

My Twin Reverb Reissue started making this high pitched noise recently and it's really annoying. I initially thought it was my Tele as when I turn down the guitar volume the noise stops however it makes the same noise with my 335-style guitar. I switched from the Vibrato Channel to the Normal Channel and the noise stopped but what's life without a little reverb, right?

I thought it may be the reverb unit or a tube however I plugged in the guitars in a Mustang II V2 I have lying around and this amp makes the same noise.

Does anyone know what the cause for this noise might be and how to fix it?

Many thanks!

Taz


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Post subject: Re: 65 Twin Reverb Reissue - High Pitched Noise
Posted: Sun Mar 04, 2018 2:52 am
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If you are taliking about just the TRRI amp, it sounds like you simply have a microphonic preamp tube in the Vibrato channel.

V2 (12AX7), and V3 (12AT7 reverb driver) are exclusive to the vibrato channel, so likely one of those two tubes. It could even be V4 (12AX7), one half of that tube for the reverb recovery.

If you have a "known good" 12AX7 and 12AT7, you can simply substitute the known good tube and see if the problem is solved. Try a 12AX7 in V2, and if the noise is gone, problem solved. If the noise still persists, put the original tube back in V2 and try a 12AT7 in V3, etc.

If you are saying that all of your guitars make the same noise on all of your amps, then it sounds like you are just too close to your amps with too much volume. All amps will feed back and produce a squeal if the volume is high enough and you are too close to the amp.

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Post subject: Re: 65 Twin Reverb Reissue - High Pitched Noise
Posted: Sun Mar 04, 2018 4:00 am
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Unfortunately I can't use the amp on a higher lever than 2 as I live in a small apartment and I usually sit about 2.5m away.

I noticed today that when I keep my hand on the bridge the noise stops. Also when I switched on the amp this morning it didn't make the noise however 15 min after I started playing, it came back. Now it makes the same sound on the clean channel.


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Post subject: Re: 65 Twin Reverb Reissue - High Pitched Noise
Posted: Sun Mar 04, 2018 5:46 am
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Still not clear if you get the noise through both amps.

If so, it's definitely external interference being picked up. Even if it's just through the TRRI your description sounds like external interference.

Cell phones anywhere near your guitar can make that noise -- even humbuckers pick that up. Computer power supplies too.


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Post subject: Re: 65 Twin Reverb Reissue - High Pitched Noise
Posted: Sun Mar 04, 2018 11:07 am
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Yes, it's both amps that make the sound.

One of your recommendations worked. I had two laptop power supplies plugged in the same multi-plug extension cord and I took them out. I haven't heard the interference sound after a couple of minutes of playing.

Thank you for your advice!


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