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
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.
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.
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.
Forte Model 2 DIP switch settings
I have the Model 2. The Switch settings:
Switches 1-3 set gain
1 on = 40dB
2 on = 50dB
3 on = 60dB
Switches 4,5,6 set loading
All three off = 47KOhms
4 on = 100 Ohms
5 on = 47 Ohms
6 on = 22 Ohms
Switches 7, 8 set capacitance
Switches off = 100pF
Switch 7 on = 200pF
Switch 8 on = 300pF
Both on = 400pF
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