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His Master's Noise: A Thoroughly Modern Tube Phono Preamp
His Master's Noise: A Thoroughly Modern Tube Phono Preamp
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Old 26th April 2010, 11:46 PM   #31
BudP is offline BudP  United States
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His Master's Noise: A Thoroughly Modern Tube Phono Preamp
Good God Stuart.... even I, with my utter lack of objective thought process can make sense of this.

Bud
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Old 27th April 2010, 01:10 AM   #32
SY is offline SY  United States
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His Master's Noise: A Thoroughly Modern Tube Phono Preamp
Uh-oh, I'd better reconsider...

Thanks, Bud.
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Old 20th May 2010, 02:23 AM   #33
grufti is offline grufti  United States
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".... a common-mode choke will make things even better, but I just didn't have one. If you do, feel free to use it."

I stumbled across this sentence and I'm wondering whether you mean:
"... use the common-mode choke instead of the dual regulator heater supply" or else: "... use the common-mode choke with the dual regulator supply, and if so where in your heater power supply?"

Well thought out indeed!
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Old 20th May 2010, 02:39 AM   #34
SY is offline SY  United States
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"With," not "instead of." I'd put it between the raw supply and the regs.
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Old 22nd May 2010, 05:27 AM   #35
Irakli is offline Irakli  United States
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Very nice article, thank you.

Just a quick question: is there a sub-miniature analog of D3a/7721 you know of? I searched and could not find any. It wuold be nice to build your amp with pencil sub-mini tubes.
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Old 22nd May 2010, 11:09 AM   #36
SY is offline SY  United States
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I'm not aware of any. Subminis do look cool.
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Old 5th June 2010, 04:03 PM   #37
danielwritesbac is offline danielwritesbac  United States
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Wow!

Although I'm not familiar with tubes, its easy to spot that the high fidelity approach isn't tacked on but rather the high fidelity approach is integral to the design itself. That's just so graceful.
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Old 19th June 2010, 04:05 PM   #38
Globulator is offline Globulator  United Kingdom
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Would a pentode like a 6j51p/EF184 be a reasonable sub. for the D3a?
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Old 19th June 2010, 06:25 PM   #39
SY is offline SY  United States
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The spec sheets I have don't give much info about triode operation. It does look like the gain is lower, as is the transconductance. Since the source impedance of the first stage is critical to getting the RIAA right, you'd want to measure the plate resistance and adjust the 20k build-out resistor accordingly. For an operating point, I'd probably start with 10mA and 1.2V on the cathode.
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Old 21st June 2010, 09:06 PM   #40
Globulator is offline Globulator  United Kingdom
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Thanks SY, sounds like it may be worth trying then. Some triode data is here:

Tube Tester Files - 6J51P



I'm still collecting the bits - I'll post back later when I've got a bit nearer!
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