New ReleaSSSes

[10thTx]

As an FYI, there are 100's of editable SCH schematics (& layouts) here:

http://www.el34world.com/Forum/index.php?board=12.0

I will often grab one from those files as a base to edit into a new idea.


There are D-style here:

http://ampgarage.com/forum/viewtopic.php?t=17449

And some D-inspired here:

http://ampgarage.com/forum/viewtopic.php?t=17500

With ExpressSCH, you can save an entire section such as a : preamp, OD section, active FX, reverb, LTPI, power amp, PT & B+ rail ........etc.......

Very easy program to use and edit. Downside is that layout components are harder to draw at angles vs. verticle/horizontal. It's still possible but more challenging.

With respect, 10thtx

[tictac]

I recall various comments in past disscussions about the SSS filters being in the RDH books. Looking through the section on Tone Controls one that looks somewhat similar to the Low filter control is the Whistle Filter.

The rotary control would be in effect varying the value of Rg and so changing what frequencies are being attenuated... does that seem reasonable?

The .01 cap that bypasses the resistor network would have the same effect as the mid-range cap in a Fender tone control circuit giving you a mid-range dip so that you're attenuating the Bass frequencies only...

I'd love to do the math but I'd need to break out the electronics books to figure out some of those funky symbols... forgot alot of that stuff from school...

I redrew the filter section to be able to better grasp what's happening there. After finding this RDH info I'm more confident the filters are drawn correctly...

Opinions?

TT

[markusw]

I believe that this is how the filters might work.
At least the frequency response looks reasonable. The 10n cap on position 5 of the high filter just looks weird.

Just did some more simulations only to find out that the 0.3H inductor in the SSS #002 schematics doesn't do anything.

Here's the frequency response at the cathode follower following the filter section with the low filter fixed at pos 7 and the high filter at either pos 2 (the lower two curves) or pos 7 (the upper two curves) .
The inductor is either 1uH or 300 mH.
As you can see there is barely a difference between 1uH and 300mH.....

[mhartman]

The thing that gets me about the elusive hi/lo cut filters is that, while we're all striving to figure out exactly how its done, I don't find myself using the hi/lo cut filters on my SSS style amp (TR Custom Clean). I wonder if any of the famous players who use SSS amps actually use the hi/lo cut filters or if they switch them out of the circuit. All of that being said, even if they don't use them, sometime the quest for the info is more fun than the result of the info.

[markusw]

sometime the quest for the info is more fun than the result of the info.

I totally agree
To help solving the puzzle, would you mind sharing some detailed gut shots of your Custom clean?

[mhartman]

No dice - the relevant sections are discretely covered in black goop. \

sometime the quest for the info is more fun than the result of the info.

I totally agree
To help solving the puzzle, would you mind sharing some detailed gut shots of your Custom clean?

[10thTx]

Given the last filter drawing (thanks), I updated the SCH schematic. Just the first page is redrawn.

With respect, 10thtx




(I added a 4th page with previous alternative filter drawings)

[wjdunham]

The thing that gets me about the elusive hi/lo cut filters is that, while we're all striving to figure out exactly how its done, I don't find myself using the hi/lo cut filters on my SSS style amp (TR Custom Clean). I wonder if any of the famous players who use SSS amps actually use the hi/lo cut filters or if they switch them out of the circuit. All of that being said, even if they don't use them, sometime the quest for the info is more fun than the result of the info.

I actually find the filters quite useful. (For me at least) - there tends to be only one setting that I use for a guitar/speaker cab combination. The high filter seems to be more dependent on the guitar, the low filter on the cabinet. The low filter is really useful for taking out the bottom end boominess, the bass control on the tone stack to fine tune it for the room.
Bill

[mhartman]

Great point Bill. Maybe I need to play with them more. From the looks of this shot, Mayer likes the low cut too:

http://www.flickr.com/photos/jacksonamp ... otostream/

Mike

The thing that gets me about the elusive hi/lo cut filters is that, while we're all striving to figure out exactly how its done, I don't find myself using the hi/lo cut filters on my SSS style amp (TR Custom Clean). I wonder if any of the famous players who use SSS amps actually use the hi/lo cut filters or if they switch them out of the circuit. All of that being said, even if they don't use them, sometime the quest for the info is more fun than the result of the info.

I actually find the filters quite useful. (For me at least) - there tends to be only one setting that I use for a guitar/speaker cab combination. The high filter seems to be more dependent on the guitar, the low filter on the cabinet. The low filter is really useful for taking out the bottom end boominess, the bass control on the tone stack to fine tune it for the room.
Bill

[mhartman]

So, does anyone know where to get the switches for the filters? Got a part number?

[David Root]

I used the six-position rotary switches that AES sells www.tubesandmore.com. OOOps they don't list them any more, only a 3-position 3-pole. They used to have a six position make before break. Try Mouser, Digikey, newark, allied.

[topbrent]

Would you need shorting or non shorting style?

Mouser sells Alpha 6 position switches in both flavors.

Non-Shorting: http://www.mouser.com/ProductDetail/Alp ... WND40Y4%3d

Shorting: http://www.mouser.com/ProductDetail/Alp ... C6dAdSA%3d

[img::]http://www.mouser.com/images/alphataiwa ... F-12RN.jpg[/img]


Full list of Alpha rotary switches in varying #'s of positions.
http://www.mouser.com/Alpha-Taiwan/Elec ... ch&FS=True

[Ang3lus]

notice the mounting style, so you won't get something you will end up throwing away

[topbrent]

I used the six-position rotary switches that AES sells www.tubesandmore.com. OOOps they don't list them any more, only a 3-position 3-pole. They used to have a six position make before break. Try Mouser, Digikey, newark, allied.

AES / CEDist still sells many varieties of rotary switches.
http://www.tubesandmore.com/scripts/fox ... =03_ROTARY

http://www.tubesandmore.com/scripts/fox ... 1=SWITCHES

https://www.cedist.com/search/node/rotary

[img:110:84]http://www.tubesandmore.com/cemirror/inv/P-H390-TH.GIF[/img]

[Structo]

Here is a 7 position with two decks

A shorting switch is the same things as make before break, correct?

http://www.mouser.com/ProductDetail/Alp ... mG5ADFU%3d