A number of tube guitar amps have a MOSFET in the pre amp. The main reason for this is to create gain without the need for an extra tube = or tubes. However, if you input an overdrive pedal or one that colours the basic voicing (amp in a box) will they work as well with the signal being fed into the Mosfet ?
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MOSFET in a pre amp & the effect on pedal input
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Most of the amps that I have seen with a MOSFET booster have multiple inputs and are based on Dumble designs. If you find that pedals don't go well before the booster you could use them with the unboosted inputs or in the effects loop.
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Originally posted by idsnowdog View PostMost of the amps that I have seen with a MOSFET booster have multiple inputs and are based on Dumble designs. If you find that pedals don't go well before the booster you could use them with the unboosted inputs or in the effects loop.
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I wouldn't worry too much about it. What pedal in particular are you concerned might cause undesirable results?
Many of the usual suspect overdrives don't really "boost" the signal all that much, if any. A relatively hot pickup easily puts out higher peaks than the Tube Screamer ever can at 9V, for example. A Tube Screamer only "appears" louder (if it does at all) because it's a whole lot more compressed. So a really hot pickup technically "hits the input stage" harder than a Tube Screamer does most of the time. Most overdrive pedals are like that including the Bluesbreaker, the Blues Driver, the SD-1, etc. So if a hot pickup is fine on your amp, then so will most stompboxes.
A Klon does have A TON of output by comparison, though.Last edited by Rex_Rocker; 03-20-2024, 12:43 PM.
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Originally posted by Rex_Rocker View PostI wouldn't worry too much about it. What pedal in particular are you concerned might cause undesirable results?
Many of the usual suspect overdrives don't really "boost" the signal all that much, if any. A relatively hot pickup easily puts out higher peaks than the Tube Screamer ever can at 9V, for example. A Tube Screamer only "appears" louder (if it does at all) because it's a whole lot more compressed. So a really hot pickup technically "hits the input stage" harder than a Tube Screamer does most of the time. Most overdrive pedals are like that including the Bluesbreaker, the Blues Driver, the SD-1, etc. So if a hot pickup is fine on your amp, then so will most stompboxes.
A Klon does have A TON of output by comparison, though.
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Originally posted by Gold star View Post
The pedals I refer to are SD1 & DS1 . Pickups are single coils, but one one guitar, 1959 Seymour Duncan HB's . It's a 10 watt and the neck humbucker gives a thick sound I don't like I believe Mosfets are put in the pre amp as an alternative to a third or fourth tube. These 'amp in a box' pedals are nonsense I think, where a Fender becomes a Marshall...
The DS-1, I don't know. I had one, and I don't remember it being very loud, but I wouldn't worry about it either.
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Originally posted by Rex_Rocker View PostAh, no. The SD-1 is slightly quieter than the TS, so no worrires there.
The DS-1, I don't know. I had one, and I don't remember it being very loud, but I wouldn't worry about it either.
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Originally posted by eclecticsynergy View PostI doubt the issue is with the MOSFET.
Vox amps have always been notoriously picky about which gain pedals they'll work well with.Last edited by Gold star; 04-01-2024, 07:23 AM.
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Originally posted by Gold star View Post
I believe that chip is put in there as an alternative to an extra tube...false economy IMO, but everything is costed
It's fairly widely recognized that Vox amps tend to be pretty choosy about which gain boxes they like, or don't like..
"You should know better by now than to introduce science into a discussion of voodoo."
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