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Author Topic: FET input  (Read 8388 times)
hywelg
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« on: April 03, 2008, 01:55:53 PM »

It seems much ignored in comments about the amp. Anyone any comments about the sound and what effect the trimmer pot has, I'm thinking of moving the trimmer pot (aswell as the O'D trimmer) to the back panel.

Thanks guys

Hywel Harris
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wyatt
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« Reply #1 on: April 03, 2008, 05:15:37 PM »

The FET input is generally ignored and considered obsolete, you won't even find a FET input on Fuches, Two Rock and most other high $$$ clones, and if you even get a chance to look at the real Dumbles being used by Robben Ford and others, you'll see the input taped over to avoid being accidentally used.  It was originally intended as an in-line preamp for very low-output PU's like acoustic piezo's.  It does add a load to the amp's power supply, so the manufacturers that leave the FET off duplicate that load with a resistor.
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gbergl
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« Reply #2 on: April 04, 2008, 02:58:22 PM »

I do use the FET input when playing my acoustic guitar.  I think the tone is rather similar compared with the normal input.  I adjusted the trim pot so that there is not much volume difference between my acoustic in the FET and an electric in the the normal input.  I suppose there would be some benefit in moving this trim pot (and the OD trimmer) to the rear panel.  If you use the FET input for different low output pickups, you could easily adjust it to match an electric in the normal channel.  Regarding the OD trimmer,  I find that the front overdrive controls (level and ratio) enable a wide range of overdrive, so I don't have a need to adjust the OD trimpot.

For me, the trimmers inside are the appropriate place.
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hywelg
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« Reply #3 on: April 04, 2008, 03:44:33 PM »

Thanks. It seems likely that at some time I will want to plug an acoustic in ( indeed I'm toying with fitting my next Warmoth project with Graphtec Ghost peizo's) so the ability to set the level on the FET Input might be useful. I'll move it to the back.

Re:- O/D trimmer, Its only since I've been reading these forums and noting that some mention they don't get the tone they are looking for unless the trimmer pot is set ina particular position, that I'm thinking the ability to tweak it will be useful and there are two spare holes after all, and indeed I could dispense with the ground switch if necessary.

Cheers

Hywel Harris
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gbergl
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« Reply #4 on: April 04, 2008, 05:02:25 PM »

You've got me thinking a little bit.  Maybe some day I'll move my trimmers to the back also.  I do wonder if the resistance of a potentiometer will be different than the trimmer and thus alter the tone.  Can the trimmer itself be mounted on the chassis back?

Nik just posted a clip on the ceriatone website (sound clips) of my acoustic guitar into the FET channel.  Check it out.
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hywelg
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« Reply #5 on: April 04, 2008, 07:13:50 PM »

Nice, very articulate guitar. Is it a peizo p-up or a soundhole? Amp seems to suit it well.
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gbergl
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« Reply #6 on: April 05, 2008, 01:54:10 AM »

Thanks,  it's a Sunrise pickup that mounts in the sound hole.  So it's not piezo, it's magnetic.  I have a few other guitars with piezo pickups that also sound great in this amp.  The amp's EQ and presence controls accommodate a good variety of pickups in my opinion.  The Sunrise pickup can be used with or without a preamp.  I do not use a preamp and this is where the FET input is nice.  (Website: Sunrisepickups.com).
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JohnE
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« Reply #7 on: April 20, 2008, 02:09:54 AM »

Enjoyed your acoustic clip very much. Now I know what that FET input is for!
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gbergl
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« Reply #8 on: April 24, 2008, 02:45:28 AM »

Thanks.
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