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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 29th March 2013, 12:53 AM   #37501
Kindhornman is offline Kindhornman  United States
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Scott,
You wouldn't want the guy you were about to race to see that you turbocharged your supercharger would you now......
 
Old 29th March 2013, 01:22 AM   #37502
elektroj is offline elektroj  Europe
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Old 29th March 2013, 01:49 AM   #37503
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by fas42 View Post
Well
You should learn how to properly link a post.

http://www.diyaudio.com/forums/analo...ml#post3430446

In '87/'88, MBL's 'Der Vorverstärker' cost the equivalent of an ML No25.
Sounded how it looked inside and out, horrible : Philishave 5534.
Despite of the fancy MU metal encased transformer, and the lovely SDS DS2E relays.
(for junk to give you the willies, google e.g. MBL 4010-5010-7005)

The current version MBL still uses opamps, renamed it to 6010, but now it's AD797 labor.
Became four times as expensive over the years, fully loaded ~$30k, but it's an excellent sounding preamp, imo.

(still not my cup of tea though, inside&out still looks horrible to me, that amount justifies the solid billet works of an ML No32 with Burr Brown & AD797)

Thing is that regardless of opamps or discrete, the emphasis has been more on the peripherics and auxiliaries over the last 10-15 years.
Which is also where the major part of the money goes to.
So who cares whether the core is opamp based or Quan'd by hand.

It's like asking advice whether you should go for a C7 Vette, or a Ferrari.
If you're a balding yuppie, I'd recommend the dinky-toy.
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Last edited by jacco vermeulen; 29th March 2013 at 01:53 AM.
 
Old 29th March 2013, 02:04 AM   #37504
fas42 is offline fas42  Australia
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Quote:
Originally Posted by jacco vermeulen View Post
You should learn how to properly link a post..
Yes, mucked it a bit ... sorry about that ...

farnk
 
Old 29th March 2013, 02:42 AM   #37505
john curl is offline john curl  United States
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You know Jacco, you guys are really amusing. Here you describe a VERY EXPENSIVE preamp that has IC's under the hood, on the Blowtorch Thread, and at the same time, condemn the Blowtorch for being overpriced, even though we used the finest selected components that we could find in the World, hand crafted everything, and put our personal best into each one, like it was one of our 'kids'. I will never understand you guys. Stay consistent, please.
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Old 29th March 2013, 03:24 AM   #37506
john curl is offline john curl  United States
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Darn, I thought that I could finely say what I really feel. Oh well.
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Old 29th March 2013, 04:11 AM   #37507
1audio is offline 1audio  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by simon7000 View Post
The AP current version I was quoted at $27K and to be honest watching the AP system 2 drop in value so fast has me put off on the line.
The more exotic and state of the art the faster the value drops. HDMI 1.3 test system from Agilent 3 years ago $250K. Today, no takers, its too slow. Similar for the Tektronix stuff. Stick to simple stuff to own. Rent the exotics stuff if it makes sense. For a single measurement get them to drop one by and see if you can get it to pay its way.
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Old 29th March 2013, 04:16 AM   #37508
1audio is offline 1audio  United States
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John Curl's Blowtorch preamplifier part II
Default 48 KHz Jitter measurement

Here is the 48 KHz from my Boonton (a "disciplined oscillator"). Its pretty clean, especially compared to the MiniDAC. I'll post more on this process here: http://www.diyaudio.com/forums/equip...ml#post3431641
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File Type: png Boonton 48 KHz spectral purity.png (31.1 KB, 216 views)
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Old 29th March 2013, 05:12 AM   #37509
elektroj is offline elektroj  Europe
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1audio, what's the indication of jitter or absence of it in your measurement? Are you sure you're measuring jitter?
 
Old 29th March 2013, 05:19 AM   #37510
qusp is offline qusp  Australia
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the presence and height/spread of harmonics/sidebands next to the base of the fundamental is the indication of jitter. 1audio/Demian has access to higher end kit and more experience measuring jitter than just about anyone on this forum...

Last edited by qusp; 29th March 2013 at 05:29 AM. Reason: added correct terminology for sidebands
 

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