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Old 29th December 2006, 11:02 PM   #1391
Wavebourn is offline Wavebourn  United States
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I've finished this prototype yesterday, going to try it today on concert:

Click the image to open in full size.

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.

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Old 30th December 2006, 07:07 PM   #1392
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It worked fine, I'm satisfied.

Click the image to open in full size.
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Old 30th December 2006, 10:06 PM   #1393
FastEddy is offline FastEddy  United States
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Wavebourn: Noticing the multi-band EQ ... is that your "pre-amp"/ front end for this fine looking Amp ??
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Old 31st December 2006, 05:00 AM   #1394
Wavebourn is offline Wavebourn  United States
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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.
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Old 31st December 2006, 05:43 PM   #1395
FastEddy is offline FastEddy  United States
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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.

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Old 31st December 2006, 11:45 PM   #1396
Wavebourn is offline Wavebourn  United States
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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.
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Old 1st January 2007, 12:30 AM   #1397
FastEddy is offline FastEddy  United States
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" ... 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?
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Old 1st January 2007, 12:55 AM   #1398
Wavebourn is offline Wavebourn  United States
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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
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Old 1st January 2007, 01:44 AM   #1399
FastEddy is offline FastEddy  United States
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" URL /image/bohantsev/13.mp3 was not found on this server. "


But thanks in any case.
Tascam equipment = pretty good for a USB device.
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Old 1st January 2007, 01:48 AM   #1400
Wavebourn is offline Wavebourn  United States
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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!
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