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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 12th April 2013, 11:15 PM   #38011
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by Steve Eddy View Post
There is a time and a place for two-tone
I'm sorry, it's just when I see a knob like that, I get all Siemens and die-cast magnesium alloy aroused.
What to say, those nazi inbreeding residuals remain hard to shunt.

What's that 1:5'r, a Cinemag 10C half-off ?

(more of an extension shaft type myself)
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File Type: pdf Haufe T7883.pdf (250.4 KB, 54 views)
File Type: pdf Haufe T890.pdf (271.4 KB, 29 views)

Last edited by jacco vermeulen; 12th April 2013 at 11:20 PM.
 
Old 12th April 2013, 11:15 PM   #38012
john curl is offline john curl  United States
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No, the quad Shalco switches are too deep.
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Old 12th April 2013, 11:48 PM   #38013
Steve Eddy is offline Steve Eddy  United States
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Quote:
Originally Posted by jacco vermeulen View Post
I'm sorry, it's just when I see a knob like that, I get all Siemens and die-cast magnesium alloy aroused.
What to say, those nazi inbreeding residuals remain hard to shunt.


Quote:
What's that 1:5'r, a Cinemag 10C half-off ?
Nah. 5C at full price. The 10C doesn't do well with 2 VRMS. Though we'll offer some 1:10's for those who are using phono stages with lower output levels.

Quote:
(more of an extension shaft type myself)
Thought so. I can tell by that smile on your face.

As for the Haufe's, near as I can tell, the highest level either of the two you referenced is just 0.5 volts. Much too low.

se
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Old 12th April 2013, 11:51 PM   #38014
Steve Eddy is offline Steve Eddy  United States
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Quote:
Originally Posted by john curl View Post
No, the quad Shalco switches are too deep.
Then don't use such a clumsy, ham-fisted solution for switching polarity.

se
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Old 13th April 2013, 12:34 AM   #38015
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by Steve Eddy View Post
Much too low.
My wild imagination figured like both those types at the inputs, SE buffer, bump it up with the 1:20 Cinemag, SE buffer again, loose some RIAA pounds, and finish with a buffer grand-plié.
Too low for a multi-stage transformer/buffer pre-pre for low+high output MC, bummer.

(The blue binding posts look pretty, but Hey, blue is always pretty. As goodlooking as Resista mk3, not like that MRS25 green, yuk)
 
Old 13th April 2013, 12:49 AM   #38016
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Yes, mil spec, 'clumsy, ham-fisted hardware'. You really don't know what you are talking about, SE. Besides, I was referring to the multi position Shalco as the real problem.
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Old 13th April 2013, 12:51 AM   #38017
Steve Eddy is offline Steve Eddy  United States
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Quote:
Originally Posted by jacco vermeulen View Post
My wild imagination figured like both those types at the inputs, SE buffer, bump it up with the 1:20 Cinemag, SE buffer again, loose some RIAA pounds, and finish with a buffer grand-plié.
Too low for a multi-stage transformer/buffer pre-pre for low+high output MC, bummer.
Haven't really thought through a phono stage. But yeah, I think it would start to get a bit messy trying to get that much gain just using transformers and buffers. I'm thinking at best you would need a high gain MC step-up trannie, feeding a buffer that took care of one half of of the RIAA curve, into another fairly high gain trannie followed by a buffer taking care of the other half of the RIAA curve, then into something like a 10C, followed by a buffer that drove an output transformer set up as a 1:2 in order to double all the stuff that you did upstream.

That's four transformers and three buffers. A but much even for a transformer lover like myself.

Quote:
(The blue binding posts look pretty, but Hey, blue is always pretty. As goodlooking as Resista mk3, not like that MRS25 green, yuk)
Blue binding posts? You mean the black ones that I photographed under a blue sky and a blue patio umbrella?

se
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Old 13th April 2013, 12:52 AM   #38018
john curl is offline john curl  United States
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Now, SE let us look at your design. Unity gain, is it? Why all the caps, trying to impress somebody? Toroids? ICK! Standard power supply bridges? Just my humble opinion. '-)
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Old 13th April 2013, 12:56 AM   #38019
jacco vermeulen is offline jacco vermeulen  Netherlands
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9 of 10 overactive heterosexual men are color-blind, just ask Miss Sheer Heights.
(Chevy would call it night-race blue)
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File Type: jpg 515se binding posts.jpg (112.6 KB, 168 views)

Last edited by jacco vermeulen; 13th April 2013 at 12:59 AM.
 
Old 13th April 2013, 02:04 AM   #38020
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Originally Posted by Steve Eddy View Post
That's four transformers and three buffers. A but much even for a transformer lover like myself.
Or was that, "A butt much ..."
 

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