Photo Gallery - Page 140

Wavebourn · 29th December 2006, 10:02 PM

I've finished this prototype yesterday, going to try it today on concert:

The prototype for this prorotype was Altec Lansing 1569A, I like their direct coupled phase splitter for the stability on low end when deep feedback is applied.
Mine uses 6p3s and 6n1p tubes. Initially I wanted 6n2p in input but gave up the idea because of stability issue on high end (too much gain). However, with different layout it would work fine.
Transformers are from ADA guitar amps. Measured maximal sinusoidal output on each channel is about 80 Watt.

Wavebourn · 30th December 2006, 06:07 PM

It worked fine, I'm satisfied.

FastEddy · 30th December 2006, 09:06 PM

Wavebourn: Noticing the multi-band EQ ... is that your "pre-amp"/ front end for this fine looking Amp ??

Wavebourn · 31st December 2006, 04:00 AM

Quote:

Originally posted by FastEddy
Wavebourn: Noticing the multi-band EQ ... is that your "pre-amp"/ front end for this fine looking Amp ??

This thing sits between mixer pult and amp to equalize flat everything from microphones to speakers. It has "FBQ" feature, LED indicator on each band control, so when feedback causes oscillation on some frequency it is visible in which band this frequency is, so step by step frequency response can be corrected before the concert. On the picture FBQ is off so all LEDs are on.

FastEddy · 31st December 2006, 04:43 PM

Wavebourn: " ... when feedback causes oscillation on some frequency it is visible in which band this frequency is, so step by step frequency response can be corrected before the concert. ..."

This is SOP for older stage hands, roadies ... ==>> A tried and true method and the best way to "equalize the venue" without resorting to lab quality equipment & measurements. Works best during final sound check with the crowd just beginning to fill the arena.

Wavebourn · 31st December 2006, 10:45 PM

Quote:

Originally posted by FastEddy
Wavebourn: " ... when feedback causes oscillation on some frequency it is visible in which band this frequency is, so step by step frequency response can be corrected before the concert. ..."

This is SOP for older stage hands, roadies ... ==>> A tried and true method and the best way to "equalize the venue" without resorting to lab quality equipment & measurements. Works best during final sound check with the crowd just beginning to fill the arena.

However, a crowd adds some damping factor, but anyway resonant frequencies almost stay the same.

FastEddy · 31st December 2006, 11:30 PM

" ... a crowd adds some damping factor ..." and that's why you wait until some of the crowd shows up = to dampen the wall reflections, etc. ... Also, how do you make your live recordings? FW > laptop?

Wavebourn · 31st December 2006, 11:55 PM

Quote:

Originally posted by FastEddy
... Also, how do you make your live recordings? FW > laptop?

From analog pult to -> Tascam US-122->laptop

Sample: http://wavebourn.com/image/bohantsev/13.mp3

FastEddy · 1st January 2007, 12:44 AM

" URL /image/bohantsev/13.mp3 was not found on this server. "

But thanks in any case.
Tascam equipment = pretty good for a USB device.

Wavebourn · 1st January 2007, 12:48 AM

Quote:

Originally posted by FastEddy
" URL /image/bohantsev/13.mp3 was not found on this server. "

Sorry...

http://wavebourn.com/music/bohantsev/11.mp3

Happy New Year!

29th December 2006, 10:02 PM	#1391
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	I've finished this prototype yesterday, going to try it today on concert: The prototype for this prorotype was Altec Lansing 1569A, I like their direct coupled phase splitter for the stability on low end when deep feedback is applied. Mine uses 6p3s and 6n1p tubes. Initially I wanted 6n2p in input but gave up the idea because of stability issue on high end (too much gain). However, with different layout it would work fine. Transformers are from ADA guitar amps. Measured maximal sinusoidal output on each channel is about 80 Watt. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

30th December 2006, 06:07 PM	#1392
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	It worked fine, I'm satisfied. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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30th December 2006, 09:06 PM	#1393
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	Wavebourn: Noticing the multi-band EQ ... is that your "pre-amp"/ front end for this fine looking Amp ??

31st December 2006, 04:43 PM	#1395
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	Wavebourn: " ... when feedback causes oscillation on some frequency it is visible in which band this frequency is, so step by step frequency response can be corrected before the concert. ..." This is SOP for older stage hands, roadies ... ==>> A tried and true method and the best way to "equalize the venue" without resorting to lab quality equipment & measurements. Works best during final sound check with the crowd just beginning to fill the arena.

31st December 2006, 11:30 PM	#1397
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	" ... a crowd adds some damping factor ..." and that's why you wait until some of the crowd shows up = to dampen the wall reflections, etc. ... Also, how do you make your live recordings? FW > laptop?

1st January 2007, 12:44 AM	#1399
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	" URL /image/bohantsev/13.mp3 was not found on this server. " But thanks in any case. Tascam equipment = pretty good for a USB device.