Full Range Open Baffle and 5W triode

pforeman · 10th August 2009, 12:13 AM

Six months ago I built a set of Open baffle 10" audio nirvana full range speakers with a 15" H frame speaker powered with a parts express 250 watt plate amp.
My intention was to then build a 5-7 watt single ended triode amp to power the speakers. I settled on design by Tubelab.
Since the beginning I was very worried that it wouldn't play loud enough (amongst other worries-building it all).
I have it all together. without ultra-linear or cathode feedback, with el34's I am getting 104 dB peaks, with little or no distortion (could have gone louder- but I'm too chicken as of yet, it is the first time on for this amp.
I would also like to say that I have the plate amp up about half way on the gain, and am only using one 15" speaker in the H frame. I am quite pleased with the combination.
Listening room 24' X 13' X 8'.
dB measured at the chair 7.5 feet from speaker.
Audio nirvana high frequency tamed with a coil/resistor-Thanks to Mr. Pass
And thanks to everyone else with either your ideas or your responses to my questions.
Paul

human.bin · 10th August 2009, 08:23 AM

pictures?

khundude · 10th August 2009, 10:04 PM

Any details of the coil and resistor because I plan on using the 10" or the 12"?

pforeman · 11th August 2009, 03:56 AM

In this forum, Nelson Pass answered my question. He has a program, and kind of offered me a student version (no charge) Regular version was many thousands of dollars!!
I didn't take him up on that! But he did recommend a coil and resistor in parallel both of which are in series with the speaker.
Coil 5 mH
Resistor 8 ohms
I used a wirewound resistor 5 watt, and a solen perfect lay 22 guage
(as it won't be seeing much or any bass, I thought the larger guage was a waste)
Paul

pforeman · 11th August 2009, 04:36 AM

sides and top of h frame are solid maple. "Baffle" is 3/4 maple plywood
FR baffle is 1/2 in plexiglass mounted on a strip of maple with a dado cut at about 10 degrees (so that it leans back and doesn't fall).
Sorry only one pic as it took me forever to resize it so I could post it
Paul

human.bin · 11th August 2009, 03:41 PM

nice works

how did you mounted the drivers onto the plexiglass?

pforeman · 12th August 2009, 02:18 AM

bolts, with a gasket of silicone "caulk"

10th August 2009, 12:13 AM	#1
pforeman diyAudio Member Join Date: Aug 2008	Full Range Open Baffle and 5W triode Six months ago I built a set of Open baffle 10" audio nirvana full range speakers with a 15" H frame speaker powered with a parts express 250 watt plate amp. My intention was to then build a 5-7 watt single ended triode amp to power the speakers. I settled on design by Tubelab. Since the beginning I was very worried that it wouldn't play loud enough (amongst other worries-building it all). I have it all together. without ultra-linear or cathode feedback, with el34's I am getting 104 dB peaks, with little or no distortion (could have gone louder- but I'm too chicken as of yet, it is the first time on for this amp. I would also like to say that I have the plate amp up about half way on the gain, and am only using one 15" speaker in the H frame. I am quite pleased with the combination. Listening room 24' X 13' X 8'. dB measured at the chair 7.5 feet from speaker. Audio nirvana high frequency tamed with a coil/resistor-Thanks to Mr. Pass And thanks to everyone else with either your ideas or your responses to my questions. Paul

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10th August 2009, 08:23 AM	#2
human.bin diyAudio Member Join Date: May 2008	pictures?

10th August 2009, 10:04 PM	#3
khundude diyAudio Member Join Date: Sep 2006	Any details of the coil and resistor because I plan on using the 10" or the 12"?

11th August 2009, 03:56 AM	#4
pforeman diyAudio Member Join Date: Aug 2008	In this forum, Nelson Pass answered my question. He has a program, and kind of offered me a student version (no charge) Regular version was many thousands of dollars!! I didn't take him up on that! But he did recommend a coil and resistor in parallel both of which are in series with the speaker. Coil 5 mH Resistor 8 ohms I used a wirewound resistor 5 watt, and a solen perfect lay 22 guage (as it won't be seeing much or any bass, I thought the larger guage was a waste) Paul

11th August 2009, 03:41 PM	#6
human.bin diyAudio Member Join Date: May 2008	nice works how did you mounted the drivers onto the plexiglass?

12th August 2009, 02:18 AM	#7
pforeman diyAudio Member Join Date: Aug 2008	bolts, with a gasket of silicone "caulk"

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