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Klemt Echolette Showstar S40 - Mastervolume

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7enderizer:
Hallo und vielen Dank für eure zahlreichen Antworten.

@ Racing: Thank you very much for your fast response and your detailed description. I really appreciate your experience.

@ Mathias: Ein Power Scaling zur Beeinflussing der Schirmgitterspannung wäre natürlich eine Möglichkeit. Allerdings sollte der Amp, abgesehen vom Master Volume möglichst Original bleiben. Dies wäre aber eine gute Alternative.

Heißt dies im Klartext, das ein Master Volume hier nicht möglich ist, sondern nur ein Power Scaling? Unser Kollege "Racing" hatte das ja im zweite Post ganz gut beschrieben.

@ Germy: Vielen Dank für deine Zeichnung. An dieser Stelle hatte ich auch zu aller erst mein Master Volume Poti gesetzt. Allerdings hinter dem 22nF (C14) zwischen Steuergitter V3 und C14. Schleifer an Pin 1 (V3), eine Seite an Masse, die andere an C14

Viele Grüße,

Nicolai

7enderizer:

--- Zitat von: Germy am 23.01.2016 17:27 ---Hier der Plan für ein einfaches Mastervolume.

Gruß Germy

--- Ende Zitat ---

Hallo Germy,

dein Master Volume funktioniert soweit.  :topjob:

Ich habe allerdings noch einiges an Anodenspannung an meinem Poti anliegen, da der Koppel C ja erst nach dem MV folgt.

Ob das auf Dauer so das Wahre ist  ???

Racing:
Nah. As i mention above Stooge is right.
With a PPIMV the presence control will be affected the more you dial volume down.

What he fails to tell you tho is that a character change is there with a powerscaling setup as well. Give it a thought for a second... ;D

In short,what im saying,is that there´s no such thing as free lunch. Ergo,whatever system you decide on you´ll still have your own ass as the rear.
My reasons for promoting PPIMV,the way I install it,is that it fills a number of voids me as an engineer find to be decency.
It is cheap. It is simple. It is reliable. It is always there and won´t cost over the long rung...like for instance a loadbox/attenuator will.

..and no. A master combined with a PPIMV has no real technical drawbacks. If we want to go indepth we can..point here is that by setting a PPIMV up in various manners we will load the phaseinverter down differently...which WILL affect sound.
However.
Quid quo pro.
The point of diminishing returns and as such..we lose simplicity.

Running a twin 2*500k log pot and a couple of extra 100nF caps amounts to shit both from a tech and economical point of view.

Racing:
Speaking of the presence control of an S40....
I own a load of Klemt/Winston amps myself and have spent quite some time fooling around with them,aim being to get them to sound contemporary.

The prescence/feedback circuit of the S40 is friggin genius and nothing short of a receipt of the knowledge of the boys  of Klemt.

If you want to learn more google "Twin-T" filter. This filter is present in most mixers from back when to this day.. Just that in the case of the S40 it´s run backwards. Genius i tell you.

That said its center frequency isn´t exactly aimed at distorted guitar but more so clean sounds. Huh? Yeah well,it works like this that the guitar is a midfocused instrument and as such shifts focus with distortion.
A clean guitar will have it´s center around the 2.5kHz mark or so while a distorted guitar will see this around the 1000Hz mark. A real difference.
That brings that as you make the S40 run into distortion,with intent,due to the install of a master and PPIMV the presence control will lose effect anyways.. :devil:

So. To make that work again you need to alter the component values of it and herein lies the trap.....as you lower the center freq by increaseing capacitor values amongst other the presence control will also become WAY easier in turning instable.
This...is a balancing act.
When you´re "out" it will be quite evident. The amp will start to oscillate at a low freq.

If you wish we can go indepth,but suffice it to say that i´ve spent some serious time figuring the values needed out...and that it works.

Give it some thought. The presence control of an S40 is one of the more effective,to this day,for a guitar amp in existence. The boys of Klemt were no fools... :bier:

Germy:

--- Zitat von: 7enderizer am 23.01.2016 19:53 ---Hallo Germy,

dein Master Volume funktioniert soweit.  :topjob:

Ich habe allerdings noch einiges an Anodenspannung an meinem Poti anliegen, da der Koppel C ja erst nach dem MV folgt.

Ob das auf Dauer so das Wahre ist  ???

--- Ende Zitat ---

Wie viel Volt ist es den?
Gruß Germy

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