parallel or push-pull

vlljpior · 5th December 2004, 08:09 PM

Hi, I not sure about my power tube configuration for my new amp. I think to put my tube in parallel like those gibson Ga-9. What do you think ? Does anyone could tell how much i ill have watt on output ? I will use some 6v6gt. it's a good choice ?

Geek · 6th December 2004, 12:13 AM

6V6, IMO, is always a good choice for a guitar amp, unless you need to fill a stadium with sound.

Paralleling the tubes gives a smoother sound, since you don't cancel the even harmonics. It also halves the plate impedance, which is fairly high with 6V6 (8 to 10K ohms each tube) and doubles the power output over a single tube in class-A.

But, with parallel, like the Gibson mentioned, you are still limited to class-A. Push-pull will give you a little more design flexibility and more power (15 watts RMS or so), but will sound different. The output transformers used are also different. SE and PP are wound and have their cores stacked *very* differently.

If you can, breadboard both SE and PP and see which you like

If anyone is wondering about a GA-9 schema, here's one: http://www.rru.com/~meo/Guitar/Amps/...Images/ga9.gif

5th December 2004, 08:09 PM	#1
vlljpior diyAudio Member Join Date: Jul 2004 Location: laval	parallel or push-pull Hi, I not sure about my power tube configuration for my new amp. I think to put my tube in parallel like those gibson Ga-9. What do you think ? Does anyone could tell how much i ill have watt on output ? I will use some 6v6gt. it's a good choice ?

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6th December 2004, 12:13 AM	#2
Geek diyAudio Member Join Date: Sep 2004	6V6, IMO, is always a good choice for a guitar amp, unless you need to fill a stadium with sound. Paralleling the tubes gives a smoother sound, since you don't cancel the even harmonics. It also halves the plate impedance, which is fairly high with 6V6 (8 to 10K ohms each tube) and doubles the power output over a single tube in class-A. But, with parallel, like the Gibson mentioned, you are still limited to class-A. Push-pull will give you a little more design flexibility and more power (15 watts RMS or so), but will sound different. The output transformers used are also different. SE and PP are wound and have their cores stacked very differently. If you can, breadboard both SE and PP and see which you like If anyone is wondering about a GA-9 schema, here's one: http://www.rru.com/~meo/Guitar/Amps/...Images/ga9.gif

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