John Curl's Blowtorch preamplifier part II - Page 3801 - diyAudio
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Old 12th April 2013, 07:46 PM   #38001
qusp is offline qusp  Australia
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I was talking about the passive preamp John, not the blowtorch

as with many here, I think despite the accompanying rhetoric and somewhat magical claims, which I dont care for, the CTC BT is an impressive discrete preamp and I have never thought any different.

if you must have empty space, leave it empty, dont fill it with an extra 10x as much air-wired signal path as needed. especially when you actually stock the very parts needed to avoid it, but choose not to use them on a single one of the all passive preamps. it wouldnt sell as much wire though. with the erm... shaft extensions installed, the direct out could have 5cm or less wire and max 10cm (easily less) for the transformer coupled out. there is no good reason for it.

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Old 12th April 2013, 08:17 PM   #38002
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I was talking about the passive preamp John, not the blowtorch
Even the Blowtorch could have benefited significantly from some shaft extenders.

se
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Old 12th April 2013, 08:19 PM   #38003
SY is offline SY  United States
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I'm trying really hard to not let out a Beavis and Butthead giggle.
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Old 12th April 2013, 08:21 PM   #38004
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I'm trying really hard to not let out a Beavis and Butthead giggle.
I'm not trying so hard.

Heh-heh-heh-heh, heh-heh-heh-heh. He said "shaft extender." Heh-heh-heh-heh, heh-heh-heh-heh.

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Old 12th April 2013, 08:56 PM   #38005
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Even the Blowtorch could have benefited significantly from some shaft extenders.

se
I thought being able to buy one was a shaft extender.
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Old 12th April 2013, 08:58 PM   #38006
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No it would not be practical to use shaft extenders, because IF the customer wanted a balanced input system, then we would run out of room, IF we used shaft extenders. Also, we would have to find an alternate way to securely mount the Shalco switch.
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Old 12th April 2013, 09:04 PM   #38007
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Now, WHY did I put up someone else's passive line preamp for people to view?
IF the critics here could actually see the GOOD in something, rather than the 'need for improvement' in virtually every case, then we might go forward.
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Old 12th April 2013, 09:22 PM   #38008
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Now, WHY did I put up someone else's passive line preamp for people to view?
IF the critics here could actually see the GOOD in something, rather than the 'need for improvement' in virtually every case, then we might go forward.
I have a nice passive preamp, Roderstein resistors and nice Shalco switches it is as transparent as I can tell. The fact that it cost only $250 might degrade it it the minds of some.
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Old 12th April 2013, 09:26 PM   #38009
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I thought being able to buy one was a shaft extender.


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Old 12th April 2013, 09:33 PM   #38010
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No it would not be practical to use shaft extenders, because IF the customer wanted a balanced input system, then we would run out of room, IF we used shaft extenders.
Why would you be out of room? If you were able to throw all that in with the input selector and volume control at the front of the chassis, why couldn't you put the same stuff in with the input selector and volume control at the back of the chassis and moving the electronics toward the front of the chassis?

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Also, we would have to find an alternate way to securely mount the Shalco switch.
Not difficult at all. Especially if you're going so far as to hog your chassis out of solid aluminum billets. Could have actually saved a bit of machining by making two compartments separated by a bulkhead that could have been used for mounting the switch and attenuators.

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