Hello,
I am relatively new to transistor electronics though have been working on tube amps for several years.
I have an 80s Yamaha G100-212 III amp which has an incredible and well-known clean channel. I've attached the schematic. Would it be difficult to take the simple preamp (Channel A) section of this channel and match it with a TDA2030A or similar power section to make a small form factor clean guitar amp?
I am building a small amp from Nightfire Electronics that uses this power section for which I have a schematic as well.
Any help appreciated
Doug Frenia
I am relatively new to transistor electronics though have been working on tube amps for several years.
I have an 80s Yamaha G100-212 III amp which has an incredible and well-known clean channel. I've attached the schematic. Would it be difficult to take the simple preamp (Channel A) section of this channel and match it with a TDA2030A or similar power section to make a small form factor clean guitar amp?
I am building a small amp from Nightfire Electronics that uses this power section for which I have a schematic as well.
Any help appreciated
Doug Frenia
Yes, but. Yama designed the power amp for a voltage gain of 330(!!). Usually we aim for 20 or 30, maybe 50. So basically you want to add another stage. In the spirit of the thing, probably an opamp wired for gain of 10, adjust on test.
YOU have it, we don´t.
Please post it here.
What PRR said, with the xcaveat that since yours is a lower power amplifier, I wouldn´t give it that much gain.
Original amp provides some 24_28V RMS ; yours will put out 8-10V RMS, so I´d settle with around 100X gain , to provide a similar experience, only not as loud.
Otherwise you risk easily clipping it at "normal" settings.
Another detail is also fitting a proper speaker. a 12" Eminence or Jensen Guitar speaker in a proper cabinet would be perfect there.
Lower power is fine if you don´t need LOUD but if you use a small speaker (8" - 10") inside a shoebox sized cabinet it will sound "small", doing justice neither to preamp nor to Guitar.