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-   -   eek, Think this is in the right place TDA 7294V question (http://www.diyaudio.com/forums/chip-amps/34023-eek-think-right-place-tda-7294v-question.html)

PhoenixFL 13th May 2004 10:01 PM

eek, Think this is in the right place TDA 7294V question
 
OK, the TDA7294V is a 100w 8 ohm power amplifier chip. I've been looking at tube amp schematics, and they all need output transformers between the power amp tubes and the speakers. . . Will I need that if using this chip? If so, what transformers should I use to go between it and a marshall 4x12 cabinet. It needs to be available online in the UK, preferably with a switch card payment option. cheers, Gra

pinkmouse 14th May 2004 10:55 AM

Re: eek, Think this is in the right place TDA 7294V question
 
Nearly, but not quite :)

I'll move this to Chip Amps for you!

Circlotron 14th May 2004 12:25 PM

Re: eek, Think this is in the right place TDA 7294V question
 
Quote:

Originally posted by PhoenixFL
Will I need that if using this chip?
99.999% of the time a solid state amp can drive a speaker directly, without the need for a transformer. This was touted as a big deal when they first appeared. For the Marshall 4x12 box the combined impedance of the loudspeakers would need to be 8 ohms. Should say somehwere.

PhoenixFL 14th May 2004 04:21 PM

Lol, Yup!
 
All standard 4x12 cabinets (Guitar anyway, not sure about bass) are at 8 ohms. I knew baout that one lol, experience with guitar teachers amp lol, But, to ask, I thought I saw something about this on the celestion website, Is there a way to connect 2 8ohm cabs up to give an over all 8 ohm impedance? in parallel maybe? i guess in series would double the resistance. . .

GregGC 17th May 2004 03:16 PM

In parallel you'll get 4 ohms. You need 4 of the 8ohms (2 pares in par and then the 2 pares in ser.)

/Greg


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