Need advice on DEEP switch and schematic validation...

[Tonegeek]

I never gave it much thought till now, but I always play with my DEEP switch ON. My understanding of ON means that the switch lifts those 270K resistors OFF the 1m,.01, 10k contour network effectively removing it from the circuit (see schematic). This appears to increase volume and low end, at least with my volume setting at 70%. Since there is so much bass this way, I end up with my bass control at about 30% at most. I am thinking now that I would like to experiment with DEEP off which will mean readjusting HRM and possibly other values as well, including the bass control.

First please validate that this schematic is correct for the Skyline EQ. I have seen other configurations of the DEEP switch but this is off the ODS -101 schematic (I modded this for my relays, a switched mid cap, and bright value).

What I would like to know is:
1) Is this the common consensus on how it works?
2) Can decent OD tone be achieved regardless of the DEEP setting?
3) I would like to know how many of you use the DEEP switch and in what context?

Thanks

[heisthl]

I never gave it much thought till now, but I always play with my DEEP switch ON. My understanding of ON means that the switch lifts those 270K resistors OFF the 1m,.01, 10k contour network effectively removing it from the circuit (see schematic).

It is drawn as "off" on the schematic. On gives an alternate path for some of the signal to get to the second stage. To my ears the overall effect is the "scooped" or "flying V" eq pattern and unfortunately a slightly reduced volume.
It does help give you a more big body type Jazz guitar tone.

[Tonegeek]

Ok, so guess I have been playing with DEEP off all this time which seems backwards because OFF sounds deeper than when it is ON. but it makes sense in terms of if you build an amp and omit the DEEP switch, you can also lose the contour network.
thanks,
Whit

[odourboy]

The schematic looks correct to me. There's a slight drop in volume when I engage DEEP (maybe the effect of scooping out the mids a bit?). So it sounds like your OFF is actually ON.

I haven't found DEEP all that useful myself. YMMV.

[ayan]

The schematic looks correct to me. There's a slight drop in volume when I engage DEEP (maybe the effect of scooping out the mids a bit?). So it sounds like your OFF is actually ON.

I haven't found DEEP all that useful myself. YMMV.

I believe there is one positive side to the Deep switch, which I never use either. With the Deep on, the PAB effect is a little more subtle, which may or may not be a desireable thing. To me, clean + PAB is sometimes too much of a boost, but with the Deep on the effect subsides a little bit.

For what it's worth, back in the day when Carlton palyed a "stock" amp he always had the Deep on. Now, he mostly does too, but there's no telling what that switch is actually doing at this point.

Gil

[Tonegeek]

With the Deep on, the PAB effect is a little more subtle, which may or may not be a desireable thing

I experience a similar thing. I find myself using the mid boost (.002 treb. cap, clean mode) at band practice sometimes just to cut through and with that AND PAB the OD can be muddy. The DEEP switch got rid of the mud, which is making me give it a second look although my feeling is I probably won't use it either in the long run. I was thinking though it may be a candidate for modding, not to scoop the mids but to actually change the corner freq. of the bass control. might be usefull for when you are using different cab types/speaker configurations. Not sure I know enough lectronics to figure that out though. Think I will take a look at a pre CBS bassman schematic for some ideas. ..