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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 20th June 2012, 03:00 PM   #23971
simon7000 is offline simon7000  United States
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Originally Posted by SY View Post
And I have a shotgun. A pairing made in heaven.
Does it use lubricated ammo?

Lard in kerosine has been the standard for ages.

Congrats!
 
Old 20th June 2012, 05:03 PM   #23972
john curl is offline john curl  United States
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Thanks, Robert F for putting up that article from 'PF'. I did not see it previously, and it clearly shows the direction people are going with tape, and WHY.
In my opinion, REMOVAL of parts from the circuit path is important for best fidelity. The early machines were relatively simple in thru-path and they sounded wonderful, much of the time, but later tape recorders, added FEATURES, and each and every one, usually added more junctions to go through. That, with 'noise reduction circuitry' Class C output stages (to save temp rise), too many channels on too little tape, etc. made transition to digital, easier, for many, but NOT everybody.
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Old 20th June 2012, 05:31 PM   #23973
jacco vermeulen is offline jacco vermeulen  Netherlands
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beron
Lovely, much more frivolous and tacky than the Bottlehead&neck Nagra works.
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Old 20th June 2012, 05:31 PM   #23974
fireworks is offline fireworks  Switzerland
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Originally Posted by scott wurcer View Post
Thanks, love this stuff... "This all new circuitry removes the syncro circuit, muting circuit, fixed output circuit, these are entire circuits composed of 38 FET’s that inhibit the purity of the signal path."

They go on of course to state that the highest quality BB IC's are now used in the signal path. So all these wonderful reviews are of music through IC's ? You high-end guys just can't agree.

Ha, ha, very funny!
I looked it up and found another "gem":

Even the same High Quality gold relay used in the Conrad Johnson Art preamp is used as a switching device between input and playback, this change alone will eliminate 8 FET’s in the signal path!

So a "High Quality" (notice the capitals) gold relay can eliminate 8 FETs ?

I am not worthy ! (I could not make this stuff up if I wanted to.)
 
Old 20th June 2012, 05:33 PM   #23975
john curl is offline john curl  United States
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So, what is your point?
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Old 20th June 2012, 05:57 PM   #23976
jacco vermeulen is offline jacco vermeulen  Netherlands
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"gem"
Sounds much classier than telling they're the same NEC relays as in an Accuphase, no ?
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Old 20th June 2012, 06:15 PM   #23977
1audio is offline 1audio  United States
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John Curl's Blowtorch preamplifier part II
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Sounds much classier than telling they're the same NEC relays as in an Accuphase, no ?
Or my furnace?
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Old 20th June 2012, 06:59 PM   #23978
elektroj is offline elektroj  Europe
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Originally Posted by john curl View Post
Well Scott, either read the magazines, go to the hi fi shows, like the most recent one at Newport Beach, or whatever it takes, to find that pre-recorded tapes are making a comeback.
Where there's demand, there will be supply. This 'comeback' happens due to large numbers of high quality tape machines being dumped/sold off for peanuts by broadcasters all over the world. Now these machines are in hands of private individuals, who would have never bought them at their original prices "back then". These days Joe "The Audiophile" Sixpack proudly owns some Studer that he bought for under 1k and he needs some tapes to play to his friends
It's a great new niche market for those who know how to exploit it, however.

Best,
 
Old 20th June 2012, 07:09 PM   #23979
simon7000 is offline simon7000  United States
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Or my furnace?
Actually furnace relays tend to be odd voltages like 22 volts. There are two possible reasons:

One is that the control transformers were standardized long ago for furnaces and when rectified at a low line level that is the voltage that they are sure would be seen.

The other is that the control board has many protection layers to prevent explosions or fires, so they don't want you repairing them. If you have the skills to just change a failed relay you probably don't know how to verify all the protection loops are still working.

Of course I doubt many furnace relays use gold plated or even flashed contacts.

Now a proper audio relay has gold or palladium plated bifurcated crossbar contacts with a mechanically remote magnet structure. They are made. The design started out from the telephone system requirements. Today these relays are mostly used in low level or RF test equipment.
 
Old 20th June 2012, 07:36 PM   #23980
scott wurcer is offline scott wurcer  United States
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So, what is your point?
The point is one of the leading tape machine refurbishers is throwing out the FET's and putting in IC's. He must have a very different idea of "perfect" sound.
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