Can anyone explain to me how the "Master" and the "Sensitivity" controls are supposed to be used? I've found lots of info here on the Forum about the EQ settings, but not much about Master and Sensitivy.
I know that I can set them both low (around 2.5) to use it as an instrument level EQ in front of a combo amp. But when I use it as a preamp going into my Ganz Straight Ahead power amp, I'd like to know what the Master and Sensitivity controls do, separately and together.
Hey Tommy I just did a huge explanation(in Bob Snelgrove thread) of this Sweeping EQ and power system from Peavey days of LTD-400, Session-400, nashville-400 and 112 and yes I discuss that power part of it>
Here's what I said:
The Shift regulates overall Midrange and there is already way too much Midrange in a pedal steel; so dial down mid to no more than 7 o'clock/off and the shift to 2 to 3 o'clock keeps it there-(more towards Bass side).
The Master sends the Power FIRST, from power amp; then the pre-gain sends the volume from it; so the more you have the Master up; the cleaner the volume is..and visa-versa..if you have the Master power send lower; then the pre-gain sends a more limited Master power there for more dirtier sound.
The whole eq system is based on "tone sweep" that shift sweeps towards Bass and back towards Midrange and you dial in the amount of Bass you want and the amount of mid that you want. Same for HIGH end. The Presence is the sweep of how much Highs you want for clarity or for ear piercing BITE!!! ha...that's why for pedal steel you start you highs down away from piercing bite and sweep the high clarity with presence and you have "PRETTY" sounded clear highs...
This EQ system is also in; LTD-400; Session-400; and Nashville-400 and many don't really know how to use it; but we all get really close to what we want to hear...but knowing this sweep system will help with TONE in all the way-different situations and model steels we play ....yeeeeehaaaaa....Have fun.
OH and I'm a Fender Twin guy for the last 25 years...But I started with learning about these Peavey amps way back in the day and guess what? I'm BACK to Peavey; I now play through my Fav. of all of them...is the 1977 LTD-400(w/round chrome knobs) with JBL K-130 Speaker(alnico mag)....I LOVE IT!
Ricky
1970's Session 400 and LTD:
Low = 50Hz boost or cut
Shift = 300 - 1000Hz Left to right
Mid = boost or cut the frequency selected by the Shift
High = 2000 Hz
Presence = 8000 Hz
The most unpleasant frequency at midrange is 800HZ
You'll find it between 12:00 and 1:00
All of it depends on which speaker and pickup you are using. The JBL has a little more natural bite. Pickup windings vary to the brand and model. I always find the correct mid frequency and its cut to be more critical to finding preferred tone. Bass and treble is easier to dial in.
If I recall, the factory set midrange tone stack on a Fender Twin is 600 Hz?
Last edited by Dennis Detweiler on 14 Nov 2024 11:32 am, edited 1 time in total.
1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Ibanez Analog Mini Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8.
I took pictures of various Sesh 400 settings on my phone and copied one of them to my Sesh 400 at rehearsal. I leave my setup at rehearsal and forget which one I chose but will post a pic next time I rehearse.
I now have a sesh 400 and I love the tone I am getting with it and my Quilter TT12. But the original post question has not been answered.
I am assuming that these two controls are gain before and after all the EQ circuitry. From the labeling, I'm guessing that "sensitivity" is the front end gain and "Master" is the back end gain. Convention would have the front end gain on the left and the master on the right. However, since the input is on the right (like all stomp boxes, and always seems weird to me), the front end gain on the right makes sense.
I have found that I need to have sensitivity pretty low- like 25%- to avoid being over driven by my pickups.
I'm quite surprised that there is no manual available on the TC Furlong website.
