Pass "DeLite" Amp from BAF - Page 31

Nelson Pass · 21st March 2010, 07:13 PM

Lamp microphonics are possible, although I haven't
encountered them. If you run the amp with an oscillator
up and down the frequency band, you will often encounter
some "singing" in the lamp at around 1 KHz, but it's pretty
minor.

chemania · 22nd March 2010, 01:56 AM

I finally got back from the in-law's (or outlaws) and had a chance to delve into the microphonics problem more. I let everything power up and get to steady state and then tapped a bulb and I got a nice distorted buzz. I get this with our without music playing through the amp. I still have to do any test with a signal generator to look for the "singing" you talked about NP.

I would suggest that anyone building these position them well away from speakers and possibly dampen the bulbs in some way. That is what I am going to look into next.

Chemania

Nelson Pass · 22nd March 2010, 07:11 PM

Different bulbs will also make a difference.

chemania · 24th March 2010, 12:02 AM

These were "Lowes" specials. Sylvania 300m/cl/rp bulbs.

tiefbassuebertr · 26th March 2010, 08:29 PM

today I found this website:
Experience Music, Inc - Eimac 75tl Amplifier
http://www.jeffreywjackson.com/amplifiers.htm
http://www.jeffreywjackson.com/speakers.htm
There you will find some cabinet inspirations for new projects

ra7 · 6th April 2010, 12:34 AM

Any suggestions for getting the big electrolytics in the power supply (from mouser, digikey, etc)? Cheap is best

For the 100V version, the caps have to be rated at what voltage?

coffin · 13th April 2010, 09:30 AM

Hi
I'd received my GB's MOSFETs today!
And Elko caps had arrived, too! They are 10000u/100V, NOS, very cheap.

Soon will start this project......

The last picture is OPT, but manufacturer told me it is rated at 1A-1.5A, so I cannot used on delite.....but maybe I can do something with LU1014!

Zen Mod · 13th April 2010, 10:06 AM

FUGLY!!

coffin · 14th April 2010, 03:37 PM

Assembled! But I don't want to put it on test, directly listen!

It sings!

coffin · 15th April 2010, 03:37 AM

Quote:

Originally Posted by Nelson Pass

Lamp microphonics are possible, although I haven't
encountered them. If you run the amp with an oscillator
up and down the frequency band, you will often encounter
some "singing" in the lamp at around 1 KHz, but it's pretty
minor.

Yes my bulbs whisper, too.

22nd March 2010, 01:56 AM	#302
chemania diyAudio Member Join Date: Jan 2005 Location: TN	More Microphonics... I finally got back from the in-law's (or outlaws) and had a chance to delve into the microphonics problem more. I let everything power up and get to steady state and then tapped a bulb and I got a nice distorted buzz. I get this with our without music playing through the amp. I still have to do any test with a signal generator to look for the "singing" you talked about NP. I would suggest that anyone building these position them well away from speakers and possibly dampen the bulbs in some way. That is what I am going to look into next. Chemania

24th March 2010, 12:02 AM	#304
chemania diyAudio Member Join Date: Jan 2005 Location: TN	Bulbs These were "Lowes" specials. Sylvania 300m/cl/rp bulbs.

13th April 2010, 10:06 AM	#308
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	FUGLY!! __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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21st March 2010, 07:13 PM	#301
Nelson Pass The one and only Join Date: Mar 2001	Lamp microphonics are possible, although I haven't encountered them. If you run the amp with an oscillator up and down the frequency band, you will often encounter some "singing" in the lamp at around 1 KHz, but it's pretty minor.

22nd March 2010, 07:11 PM	#303
Nelson Pass The one and only Join Date: Mar 2001	Different bulbs will also make a difference.

26th March 2010, 08:29 PM	#305
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	today I found this website: Experience Music, Inc - Eimac 75tl Amplifier http://www.jeffreywjackson.com/amplifiers.htm http://www.jeffreywjackson.com/speakers.htm There you will find some cabinet inspirations for new projects

6th April 2010, 12:34 AM	#306
ra7 diyAudio Member Join Date: Feb 2009 Blog Entries: 1	Any suggestions for getting the big electrolytics in the power supply (from mouser, digikey, etc)? Cheap is best For the 100V version, the caps have to be rated at what voltage?

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