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2:1 Step Up Device for low output cartridges. |
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Smokeyjoec
New Member Joined: 07 May 2019 Status: Offline Points: 17 |
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Posted: 04 Jul 2019 at 1:55am |
What about an Accession (simplified) with variable output gain and switches for capacitance, mono and 2 outputs without the numerous RIAA curves. I’m not sure how much that would simplify the circuit design and reduce the costs?
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Lucabeer
Senior Member Joined: 24 Jan 2009 Location: Torino, Italy Status: Offline Points: 711 |
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Graham, I had missed this discussion! If you will ever make such a phono stage, let's call it a "Reflex M+": - innovations introduced to of the Accession for the RIAA equalization kept separate from amplification (your patent, in short - no need for selectable equalization curve or "flat", though) - selectable gain (let's say 40 dB, 44 dB, 48 dB for MM) - mono switch - selectable resistive and capacitive loading via easy front switches (no rear mini-switches) - no volume pot (unless used to select the gain!) ... well, you already have a customer! |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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At some point and on my list of things to do, I will be making a high output phono stage to suit those who insist on using insensitive valve amps. Such a device needs a very high supply voltage so that the signal doesn't clip. Actually it needs more than the usual 36 volts which opamps work on, and so requires the use of a ranging supply. I had thought of incorporating it into the "big Accession". I had also thought about giving each input (yes, this will have inputs for two cartridges) its own level control. Therefore it will do exactly what you're looking for. We will be happy to accept trade-ins
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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GrahamD
New Member Joined: 13 Feb 2015 Location: Auckland NZ Status: Offline Points: 34 |
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Easiest way is to attenuate the loudest one. A double pole switch and four resistors (two per channel) between phono stage and amp input would do that. [/QUOTE] Ah yes, I've already done that with a DIY L Pad to the CD player input to the amp. Now I would like to do the opposite ( amplify rather than attenuate) the Denon HOMC output. If this is going to be more trouble than it's worth I'll forget about it and just turn the volume up. Cheers
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Drewan77
Senior Member Joined: 25 May 2013 Location: Chester,England Status: Offline Points: 1544 |
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This isn't an answer to GrahamD's question but it gives me a chance to praise the Majestic/Accession for the way they solve the same issue in my system.
My preamp has two analogue inputs - one balanced XLR, the other standard RCA. One turntable goes via the Accession variable output directly into the preamp (RCA). The other via a Reflex M using the Majestic analogue input & then into the preamp (balanced, using the Majestic variable output). The Majestic also handles various other digital devices. With the volume dials on both Slee devices set by ear, all inputs, digital and analogue remain at the same volume level when switching. Perfect!
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Older than I once was, younger than I'll be
............................. Andrew |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Well, this one definitely exists... Easiest way is to attenuate the loudest one. A double pole switch and four resistors (two per channel) between phono stage and amp input would do that. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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tg [RIP]
Moderator Group Joined: 19 Jan 2008 Location: Sydney Status: Offline Points: 1866 |
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This thread covers the issue of perceived greater surface noise from the DL-110 and offers a method to reduce that that does not involve output boosting. It might prove of interest to have a read of it. Edited by tg - 17 May 2017 at 10:44am |
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Tony G
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