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Old 9th October 2012, 11:34 PM   #2331
Zen Mod is offline Zen Mod  Serbia
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I'm speakerholic

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Old 10th October 2012, 03:10 AM   #2332
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Default RCA Olson coax drivers

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Originally Posted by Zen Mod View Post
Hi there Zen: Thanks for posting the information on these drivers. I knew an RCA service man who had aquired a pair and drove them with a pair of Berkshire (PP 6L6) amps. The shop had one of the amps laying around, canabilized, and in need of repair. So $50 and I had an interesting project: Since the motors for tuning and function change were missing, I replaced them with manual drives. Replaced the selenium low voltage full wave rectifiers (filiment DC supplies) with 1960's diodes/home made heat sinks, and replaced some tubes. Used it to power a diy A-7 VOC.....some fun in those days....regards, Michael
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Old 10th October 2012, 11:56 AM   #2333
Zen Mod is offline Zen Mod  Serbia
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HPO had 6F6 based PP for them

anyway - they're extremely easy on amp , you can even feed them with wallkman

I know that I'm using mine with under 450mW peak (DAC ditto in F4)
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Old 12th October 2012, 02:37 PM   #2334
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Is this thread in a coma or something? Where are the regulars? I lost the drive [or pleasure] to stir up Zen Mod!
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Old 12th October 2012, 02:44 PM   #2335
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Is this thread in a coma or something? Where are the regulars? I lost the drive [or pleasure] to stir up Zen Mod!
Waiting for the time to build the F6 and join the fun.
This doesn't happen over night. Last pre amp crossover took over a year to complete.
Buzz and Ihquam are building rock stars, most people will take much longer to build. Some never will, just collect parts and lose interest.
I've done that before.

Rush
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Old 12th October 2012, 02:53 PM   #2336
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Quote:
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Waiting for the time to build the F6 and join the fun.
This doesn't happen over night. Last pre amp crossover took over a year to complete.
Buzz and Ihquam are building rock stars, most people will take much longer to build. Some never will, just collect parts and lose interest.
I've done that before.

Rush
I agree that good things take time. I already received BA-3 amp PCBs from the diyAudio store. Top quality. Tea-Bag will supply me with a quad of matched SemiSouth R100A; worth the expense and a great X-Mas present to move forward my F6 project.
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Old 12th October 2012, 03:23 PM   #2337
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Antoinel View Post
...... to stir up Zen Mod!


The Pass Pub: The High-End Off Topic Thread
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Old 12th October 2012, 03:27 PM   #2338
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It's not my job to pleasure ZM.
I'm sick. Blah!
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Old 12th October 2012, 04:11 PM   #2339
lhquam is offline lhquam  United States
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I am still trying to figure out why one channel is acting strangely. I see two problems: 1) the noise floor and distortion spectrum moves up and down with a period of 1-2 seconds; 2) the distortion spectrum is not nearly as good as the other channel.

Problem 1 is almost certainly related to the bias circuit. A SPICE Bode plot of the circuit shows a hump in the response at 1/3 Hz and a phase margin of only 42 degrees at 1/8 Hz. My experiments today will be with different values for the large electrolytic caps in the bias circuits with the intent to improve the phase margin.

Stay tuned to this channel.
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Old 12th October 2012, 05:49 PM   #2340
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Problem 1) I reduced the bias circuit caps from 470uf to 100uf and the oscillatory behaviour of noise floor and harmonic spectrum went away.

Problem 2) I swapped the R100s between rails and did not get a significant improvement. I then replaced the R100 on the top rail with spare R100. The harmonic spectrum can now be adjusted to be much closer that of the other Teaser-6 channel.

Listening tests are next.
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