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-   -   Forte' audio model two preamplifier (http://www.diyaudio.com/forums/pass-labs/143122-forte-audio-model-two-preamplifier.html)

saperusa 28th April 2009 06:33 PM

Forte' audio model two preamplifier
 
I have bought a forte' audio model two second hand but I would like to set the internal dip switch to set properly the phono stage but nothing is written.
Has anyone the setting of the internal switch inside model two
Thank You

Nelson Pass 28th April 2009 08:23 PM

I only have the schematic of it's successor, the 40, however I think it's
about the same.

For each channel I see 4 phono loading switches - 150 pF, 1K, 100, and 47
ohms. The default with all of them off is 47K ohm.

:cool:

treuben 17th August 2012 06:34 PM

Forte model 40, model 2 Fet 10HL
 
I am looking at the schematic for the model 40 and the fet 10HL and thinking there are many similarities. (to my untrained eye anyway!) Does anyone know enough to comment on how similar they might be (for a poor man's alternative to fet 10HL) and how the model 2 might differ technically? People keep mentioning replacing op-amps in these things but are they involved simply as servo amps or as signal amplifying devices? I can't see op-amps in the line stage of the 40. Kind regards, Trevor from Australia. (p.s. thank you Mr Pass for all your designs and shared ideas. I am a big fan of the Fet 10 HL too even if I can only listen to a friend's right now!) I built a B1 for my own home and embarking on an f5 now.

AMV8 17th August 2012 08:11 PM

Hi
If you e mail me your e mail address I will send you a copy of the owners manual for the Forte 40 pre amp which includes details of how to operate the internal switches.
Don

treuben 23rd August 2012 02:09 PM

Quote:

Originally Posted by Nelson Pass (Post 1814222)
I only have the schematic of it's successor, the 40, however I think it's
about the same.

For each channel I see 4 phono loading switches - 150 pF, 1K, 100, and 47
ohms. The default with all of them off is 47K ohm.

:cool:

Mr Pass, I wonder if you could possibly post the Forte 40 schematic you mentioned here? Or (if it isn't handy) might you tell me if it uses the same kind of line stage as the fet 9 and 10 (original non-e versions) I have the *phono* schematic for the forte 40 and the *line* stages for fet nine and ten (old versions) and they all seem very similar to my inexpert eyes. (I think one of them has a diode ccs for the fet pair vs transistor for the others and one has paralleled 2n5566's vs one - I'm not sure why. I have a fet nine myself and am considering a model 40 (as it's balanced by the looks and I'd like to try those inputs on something else). Is the line stage for the 40 along the same lines? Thank you and kind regards, from Australia. 8) p.s. I have read many of your discussions (thank you) and built a B1 too for kicks. I think it's wonderful so thank you for that gift too!


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