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previous: Chris Harden It was only a thought, esp. as I am... -- 6/14/2000 1:36 PM View Thread

Re: Noise reduction circuits

6/14/2000 2:26 PM
Ray Ivers
Re: Noise reduction circuits
I personally believe that SS and tube can peacefully coexist - I would think that anyone who's ever used and liked a pedal might agree - but I also feel that there can be a certain 'design focus' in an all-tube amp that can be easily lost when hybrid circuits are introduced. You have to be careful, and keep in mind what you want to achieve rather than what CAN be achieved. Peter's right - it's more an aesthetic thing than something that can be explained using numbers and graphs. It seems that I've rarely encountered a SIMPLE hybrid design; it's either 17 op-amps or nothing, although there are exceptions, of course.  
The Hush chip is the only single-ended guitar-amp noise reduction circuit I've ever heard (are there others?), and I liked it when used in moderation. When the noise reduction effect was turned way up (trying to get four cascaded gain stages quiet as a CD, for example), I thought the tone started to suffer (treble rolloff), but to reduce noise from obnoxious to acceptable in a super-hi-gain design, I think the benefits outweigh the drawbacks. I believe that an effects loop that will work with ALL pedals (T.C. Electronics chorus included!) should be in the range of 500 mV peak-to-peak AC (about -15 dbM, I believe). I would think your Hush unit would slide right in here; you could add a true-bypass switch and make it completely go away when not needed.  
An FET makes a pretty quiet first stage, that's for sure.  

Peter S Don't mind me......I'm just really ... -- 6/14/2000 3:09 PM