FireFly Amp Question

cwoodall · 26th November 2005, 10:52 PM

Hi,

Just a quickie. I'm building a FireFly 0.5W tube guitar amp (2/12AX7, 1/12AU7). On the schematic posted on the AX84 site, it suggests using all 400V or higher caps. The power transformer I'm using is the Hammond 269EX (sec: 190-0-190). The circuit uses 3-47 uF filter caps. I have 3 nice 47 uF/350V caps..........driving 1 10"-8Ohm speaker. Any thoughts????

Thanks,

Curtis

Eli Duttman · 26th November 2005, 11:41 PM

You should be fine with the 350 WVDC parts. 190 VRMS is roughly 269 V. peak. Even if you SS rectify, there will be small losses and all vacuum rectifiers have a significant forward drop. Go for it.

cwoodall · 26th November 2005, 11:47 PM

That's about what I figured, but, being a relative newcomer here, I just wanted to get some confirmation. The value of this forum and the people that participate in it is tremendous.

Thanks so much,

Curtis

26th November 2005, 10:52 PM	#1
cwoodall diyAudio Member Join Date: Aug 2005	FireFly Amp Question Hi, Just a quickie. I'm building a FireFly 0.5W tube guitar amp (2/12AX7, 1/12AU7). On the schematic posted on the AX84 site, it suggests using all 400V or higher caps. The power transformer I'm using is the Hammond 269EX (sec: 190-0-190). The circuit uses 3-47 uF filter caps. I have 3 nice 47 uF/350V caps..........driving 1 10"-8Ohm speaker. Any thoughts???? Thanks, Curtis

26th November 2005, 11:41 PM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	You should be fine with the 350 WVDC parts. 190 VRMS is roughly 269 V. peak. Even if you SS rectify, there will be small losses and all vacuum rectifiers have a significant forward drop. Go for it. __________________ Eli D.

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26th November 2005, 11:47 PM	#3
cwoodall diyAudio Member Join Date: Aug 2005	That's about what I figured, but, being a relative newcomer here, I just wanted to get some confirmation. The value of this forum and the people that participate in it is tremendous. Thanks so much, Curtis

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