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Post by jampa on Feb 15, 2019 4:39:38 GMT -6
Ok, Gents, Here is just one more... I knew it was going to be good but that was great!
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Post by sirthought on Feb 15, 2019 5:20:43 GMT -6
It's a really big, clear sound. The acoustic was just very much alive. And I admire your talent for playing and singing.
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Post by jcoutu1 on Feb 15, 2019 6:26:42 GMT -6
So lets start the ball rollong and say $1500 in parts and casings and say $1000 in labour costs and marketing so i think $2499 sounds good price point or am i dreaming? I'm guessing $6500.
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Post by Vincent R. on Feb 15, 2019 7:36:04 GMT -6
The only thing disappointing about this piece is that it’s probably too expensive for me to own at the moment. Great job Dan.
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Post by subspace on Feb 15, 2019 8:03:09 GMT -6
So lets start the ball rollong and say $1500 in parts and casings and say $1000 in labour costs and marketing so i think $2499 sounds good price point or am i dreaming? Wait, is Dan moving to Chile?
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Post by bluegrassdan on Feb 15, 2019 8:18:53 GMT -6
So lets start the ball rollong and say $1500 in parts and casings and say $1000 in labour costs and marketing so i think $2499 sounds good price point or am i dreaming? Wait, is Dan moving to Chile? Haha! There’s actually about $2,500 in parts. The Jensens are about $750, tubes about $450, and the stepped gain switches are $40 each.
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Post by nick8801 on Feb 15, 2019 15:30:35 GMT -6
Sounds gorgeous. I love the extra power switch. It’s a really smart design. If I was in the market, I think 1000 a channel would be fair. Maybe 3999.99?
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Post by donr on Feb 15, 2019 19:49:26 GMT -6
Dan, you are one talented fellow.
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Post by Mister Chase on Feb 15, 2019 22:33:19 GMT -6
With such short runs, unless he has a *really* good friend in the metal biz, the paint and chassis metal work isn't cheap either.
Great stuff almost always has the matching price tag. I have no doubt it's worth every penny.
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Post by bluegrassdan on Feb 16, 2019 1:07:07 GMT -6
Even this evening, I was still tweaking the circuit a bit. Still trying to get that extra 1% out of it.
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Post by wiz on Feb 16, 2019 17:50:18 GMT -6
Just fantastic
Cheers
Wiz
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Post by bluegrassdan on Feb 16, 2019 18:03:58 GMT -6
One more circuit modification. This video is a "less-detailed" explanation.
I had been "almost" satisfied with the harmonic saturation characteristics with louder input sources. But most of the time I found myself padding the input for less harmonic distortion.
So, last night and today I experimented with eliminating the cathode bypass capacitors from both 6072 gain stages. The second gain stage made little difference, but eliminating the first gain stage cap resulted in -6.3 dB in THD, more linearity, and better transients, with the downside of losing 6.3 dB of gain.
Then, I got to thinking. The "Ribbon" switch could serve three functions:
1. Disable 48v phantom (which it does currently) 2. Bypass the input transformer secondary resistor (which it does currently, and provides 1 dB of gain) 3. Insert the cathode bypass cap to bring back the 6.3 dB of gain, plus the 1dB, for a total of 7.3dB.
This means the normal settings will provide 58.5 dB MAX gain. Selecting the "Ribbon" switch allows 65.8 dB MAX gain.
I'll need to update the front panel, but I like the sonic options. And there is nothing preventing someone from using the "Ribbon" mode for a tube or dynamic mic.
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Post by drumhead57 on Feb 16, 2019 20:26:43 GMT -6
Me want
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Post by stormymondays on Feb 17, 2019 10:05:43 GMT -6
The performance and recording of the song was just fantastic! I'm saving rack space (and dough!) for this.
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Post by matt on Feb 17, 2019 20:48:34 GMT -6
I like the sonic options. And there is nothing preventing someone from using the "Ribbon" mode for a tube or dynamic mic. Yes. Great implementation. Every change increases the want factor! I think I would flip the Ribbon switch and forget how to turn it off. Gain is good. Congratulations on a great design!
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Post by indiehouse on Feb 17, 2019 21:04:23 GMT -6
I would sell some gear for this. Even then, I doubt I could afford the probable price tag. Single/dual channel version?
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Post by Mister Chase on Feb 18, 2019 1:07:42 GMT -6
Was the single or dual version he did last year a totally different design? Man I wanted one.
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Post by pope on Feb 18, 2019 6:09:52 GMT -6
That sounds very good and what a great performance! Being a geek, I was wondering whether you had the chance to take any measurements (frequency response. THD, headroom, etc..). Not that it really matters if it sounds good but I'm just curious
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Post by Martin John Butler on Feb 18, 2019 9:03:39 GMT -6
Amazing idea with the ribbon switch Dan.
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Post by roundbadge on Feb 18, 2019 13:10:03 GMT -6
Looks great! The only thing I was thinking how do you power phantom powered ribbon mics like the Royer 122’s etc in “ribbon” mode?
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Post by notneeson on Feb 18, 2019 13:11:58 GMT -6
Looks great! The only thing I was thinking how do you power phantom powered ribbon mics like the Royer 122’s etc in “ribbon” mode? My experience with the 122v suggests they wouldn't need ribbon mode, but good question.
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Post by roundbadge on Feb 18, 2019 15:51:38 GMT -6
Looks great! The only thing I was thinking how do you power phantom powered ribbon mics like the Royer 122’s etc in “ribbon” mode? My experience with the 122v suggests they wouldn't need ribbon mode, but good question. Yes I was thinking it’s a mute point
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Post by Johnkenn on Feb 18, 2019 16:32:46 GMT -6
Ok, Gents, Here is just one more... This time with KM84s, a FLEA 47, and 1176 on vocals. Padding the inputs for a clean tone. Holy crap. I want to be Dan when I grow up...
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Post by Johnkenn on Feb 18, 2019 16:33:20 GMT -6
bluegrassdan - are there any more 2 channel versions left? Or was it one channel?
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Post by bluegrassdan on Feb 18, 2019 22:44:25 GMT -6
Thanks for the kind words, everyone. I have (I think) four 2-channel chassis remaining. My plan is to phase the two-channel version out once those are built and sold.
From now forward, everything I build will be powered by external PSU. It's just so much better in every way. The only exception might be a single channel compressor or something where noise is not a critical as the preamp stage.
Still tweaking and finalizing the four-channel design. It's 95% there. Just chasing down a few gremlins.
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