Techtalk

Tolle Kiste, Stephan! Gibt es dazu einen Schaltplan? Beim Deckel draufschrauben hätte ich etwas Angst vor den Kondensatoren auf der rechten Seite.
Bernd

Hi,
welcome on board. This project is going to be on pcb with separate solid state psu for B+, bias voltage, optional AC heater and extra rail for relays, leds etc. So all tube will be mounted with tube sockets on pcb. We haven´t thought about the transformers for input and power yet. We are going ...

@Rumi
ergänze dein Profil bitte mit deinem Wohnort. Falls du zufällig in der Nähe wohnen solltest, dann kannst du dir das Pult auch gerne vor Ort anschauen.
Bernd

Hi,
also den Klang eines Pultes zu beschreiben ist eigentlich unmöglich. Ich kann dir nur sagen, dass ich seitdem ich das Pult habe, keine Plugins mehr benutzt habe, weil man mit den EQs des Pultes und ein paar guten Outboardgeräten deutlich schneller und besser zum gewünschten Ergebnis kommt. Wenn ...

Hi,

http://twin-x.com/groupdiy/albums/userp ... link~0.JPG

schematic updated with further details for tubes being used and capacitor values (7abc). Can anyone confirm?
Bernd

Thanks for your reply, Darius. For the 4K7 I just did what RETRO supposed to have done with their STA Level:

Ok, I started to modify the schematic and included the variable recovery time mod as done by DRIP and others. I found an interesting statement, supposed to be made by Phil from RETRO about ...

Here is a modified schematic with a few ideas

http://twin-x.com/groupdiy/albums/userpics/Gates_Sta-Level_Schematic_with_triple_mode_and_release_mod_input_pad_switch_fp_pcbs_stereo_link~0.JPG

More questions:
1) Is the stereo link option correct the way I did it?
2) Are there any disadvantages when ...

A few questions before Tony starts to do the layout.
- is there maybe an easier solution for the voltage divider/rectifier part of the circuit? Maybe a simple 100V Zener diode?
- trimpots: would it be comfortable to have trimpots between R8/R9, R15/R16?
- should we make the input pad switchable as ...

Hallo Simon,
du hast private Post.
Bernd

Hi Jens,
da habt ihr ja einiges an tollen Kisten herangekarrt. Den Stinkefinger über den geöffneten VK1 finde ich genial!!! Sehr geile ADT Konsole!! Irgendwann werde ich dich auch mal in deinem Tempel besuchen kommen. Tolle Bilder.
Gruß an alle Beteiligten.
Bernd

Hi Darius,
very well explained. So it would be fine to take the 105V from B+, substitute the OB2 with a TL783 and make the bias voltage for the 6AL5 variable with a 100K trimpot.
Thanks
Bernd

Oh, haven´t seen that the 25V is derived from the B+ voltage. So if we provide R33 &34 directly with 25V we can leave out the voltage drop resistor the voltage divider and the OB2. Can somebody confirm, plz?
Bernd

Can anyone have a look at the psu on the original schematic? We need to know which parts of the original psu can be ommitted and substituted by our solid state psu. Do we need the O82 tube/neonlamp?
Bernd

Ok, I started to modify the schematic and included the variable recovery time mod as done by DRIP and others. I found an interesting statement, supposed to be made by Phil from RETRO about how they implemented the triple mode:

The Retro Sta-Level has all the same circuitry and component values as ...

Just to add: the tube psu and the relay boards are ready. Only the main board has to be done including all the options and modification we should imply.

Feel free to download the schematic (original version) and draw in the modifications (e.g. Single/Double/Triple switch, Release mod, input/output ...