Farfisa TR-70 guitar amp

[doctor]

I'm looking for Farfisa TR-70 guitar amp schematics.
Any help will be highly appreciated.

[vintagekiki]

Farfisa TR70

[doctor]

Farfisa TR70

Thank you very much.

[gaitadura]

Hello i'm Carlos From Portugal, and i'm repairing a guitar amplifier Farfisa GR from a friend.
I need the schematic, it has 4 EL34, 2 ECC82, and the preamp. has transistors.
If any body has schematic, plesase post here i'm apreciate.

Carlos

[J M Fahey]

Hi Carlos, re-post your question in another post, mentioning Farfisa GR in the title, you'll get more visibility than in this old thread.
Boa sorte com o conserto.

[gaitadura]

Ok. Obrigadão. Thanks; Já agora respondeu em português correcto, significa Lusitano, ou "irmão brasileiro"?
Bom de qualquer maneira a parte de valvulas ou seja a amplificação já está reparada e com o esquema levantado, e vou postar como anexo para alguem que precise.
Em inglês pouco correcto:

Well i make the reparation of the valved part, and i have the schematic of this part made for me in Kicad,and i post that to anyboy that need schematics.


Carlos

[J M Fahey]

OK , post the schematic of what you already have, it will help somebody else.
If possible try to convert the Kicad type into a .bmp, .gif or .jpg so anybody can read it, maybe it has such an option.
Worst case, virtually "print" (to file) from Kicad into an Apple (postscript) printer ; the resulting .ps file can be converted into any of the other formats or at least opened by Photoshop and many others.
They might not *call* it .ps but it usually is.
If not possible, many PCB design programs can export to .DXF (the Autocad type)
To repair the transistor part, inject some audio signal and follow it along its path ... when you lose it ...... check around: bias, leaky capacitors, rusty/dirty connectors, switches, jacks, etc.
The pots must be *very* dirty.
Transistor collectors usually should be at about 1/2 the voltage of their supply.
Base to emitter you must have around 0.65V if Silicon or 0.3 if Germanium.
This is generic testing which works anywhere without schematic.

Quase acertou, sou um "irmão Argentino" mas muito interessado tanto no Portugal (o que já visitei) como no Brasil , onde vendo amplificadores e falantes.
Abraço e boa sorte.

[lordbizarre]

hello ! the schematic pdf from Vintagekiki (see earlier) for the FarFisa TR70 doesn't open anymore...can someone refresh this pdf. ?
thx !!!!

[vintagekiki]

Farfisa TR 70

http://elektrotanya.com/Farfisa_TR70.pdf/download.html

[Jfavaro]

The PDF schematic does not download any more. Could you please repost?

[vintagekiki]

Farfisa TR-70

http://elektrotanya.com/farfisa_tr70_sch.pdf/download.html

[Jfavaro]

Thank you, Vintagekiki. Would you be able to find the schematics for a Farfisa TR-70 OS? I appreciate your help

[vintagekiki]

Unfortunately I do not have the schematics for the Farfisa TR-70 S

See the following links maybe you can help

http://www.freestompboxes.org/viewtopic.php?f=19&t=9878
http://www.effectsdatabase.com/model/farfisa/sferasound

http://files.effectsdatabase.com/gear/pics/farfisa_sferasound_004.jpg
http://www.freestompboxes.org/download/file.php?id=8236

[vintagekiki]

Would you be able to find the schematics for a Farfisa TR-70 OS?

Here is

http://music-electronics-forum.com/t37148/

doctor thanks for the schematics

[mty]

Here is

http://music-electronics-forum.com/t37148/

doctor thanks for the schematics

Hello Everone,

I'm looking for some more info on the Farfisa TR70. I own 2 of them and they are stellar amps.

Does anyone know what the brand, impedence, power rating and efficiency of the speakers are?
What is the input next to the on/off switch used for? It says "Ext. Amplif" so I assumed it was a way to connect a different amp to the speakers but that doesn't seem to be the case.

Many thanks,
Marty